Wide-angle Polarization Independent Multilayer Microwave Absorber Using Wind Driven Optimization Technique
|
|
- Jonas Green
- 6 years ago
- Views:
Transcription
1 Wide-angle Polarization Independent Multilayer Microwave Absorber Using Wind Driven Optimization Technique Prakash Ranjan Research Scholar, Department of Electronics and Communication Engineering, National Institute of Technology, Jamshedpur, Jharkhand, India. Orcid Id: Arvind Choubey Professor, Department of Electronics and Communication Engineering, National Institute of Technology, Jamshedpur, Jharkhand, India. Santosh Kumar Mahto Assistant Professor, Department of Electronics and Communication Engineering, Indian Institute of Information Technology, Ranchi, Jharkhand, India. Orcid Id: X Abstract In this paper, a novel cost function for optimal of multilayer microwave absorber is presented which overcome a major drawback of the multilayer absorber synthesis found in the literature. The proposed cost function has simultaneously included the both normal and oblique of wave up to wide angle of (0 to 60 degree) with TE & TM polarization which was seldom found in literatures. This leads to optimum of multilayer absorber which can work well for wide angle of and are also polarization independent. Here, six models ( 1 6) of multilayer absorbers are proposed using WDO algorithm for different popular frequency bands ( , 2 8, 8 12, 12 18, 2 18 and 26 37GHz respectively). Different configuration of layers such as 9-layer, 7-layer, 5-layer, -layer and 3-layer are considered for each proposed model (frequency band) and the best configuration is selected as winner. Obtained results are compared with previous reported results in literature. A detailed analysis are done and it shows that the application of WDO yields improved numerical results in terms of thickness and oblique of wave implementation as compared with the earlier reported results. Keywords: Multilayer microwave absorber, Metaheuristic algorithms, WDO, Chew s, recursive formula, 5G communication system. INTRODUCTION Nowadays, development of multilayer microwave absorbers find great attention due to its various applications such as: electromagnetic interference reduction, radar systems, stealth technology, wireless communication systems, satellite system and mobile phones. Also, in 5G communication systems, there is need to absorbers for high frequency applications which can solve many electromagnetic compatibility issue [1]. The synthesis of multilayer absorbers are done with having the main objective is to minimize the overall reflection coefficient from its top surface. Calculation of the reflection coefficient in the case of multilayer structures such as multilayer absorbers can be done using Chew's recursive formula [2]. There are number of nature inspired optimization techniques and their derivatives which have been proposed and successfully implemented to synthesize the multilayer microwave absorbers in the last decade. Some of them are: Particle Swarm Optimization (PSO) and its derivatives [10-13], Genetic algorithm (GA) and its many derivatives [3-7], Self-Adaptive Differential Evolution (SA-DE) algorithms [8], Central Force Optimization (CFO) [9], Spiral Algorithm (SPA) [1]. Performance comparison of three optimization algorithms, namely PSO, Bat Algorithm (BAT) and Cuckoo Search Algorithm (CSA) for multilayer microwave absorber has been done in [15]. However, in general, all reported s of multilayer microwave absorber were synthesized for the specific of a wave either for a normal [3-1] or for an oblique of a wave with TE or TM polarization, taken one at a time [7],[10-11]. The involved cost function in optimization process had only considered the same specific of a wave without considering the normal and oblique of wave simultaneously in their problem. Thus, the reported 8016
2 models are practically undesirable simply because it cannot work efficiently for the range of of wave belongs to outside of its (i.e. for a normal and oblique of wave simultaneously). Although, models reported in [10] got some success for a normal and oblique of wave simultaneously but fails to give any rationale for it. Results for oblique of wave were obtained in [10] without considering the normal and oblique of wave simultaneously in their problem and therefore, can't be taken as the valid strategy. Hence, most of the reported s are limited with their own constraints and required a relook. To overcome above problems, this paper focuses on the optimal of multilayer absorbers through a proposed new cost function. This cost function has included both normal as well as oblique of wave for a very wide angle of with both polarization TE & TM simultaneously. Recently, a new nature inspired, efficient, iterative, heuristics and population-based optimization technique, Wind Driven Optimization algorithm has been proposed by Bayraktar [16]. In general, it has proved to be more effective than the earlier reported optimization techniques for many optimization problems in electromagnetic [17-21]. Here, six models ( 1 6) of multilayer absorbers are proposed using WDO algorithm for different popular frequency bands ( , 2 8, 8 12, 12 18, 2 18 and 26 37GHz respectively). Different configuration of layers such as 9-layer, 7-layer, 5-layer, -layer and 3-layer are considered for each proposed model (frequency band) and the best configuration is selected as winner. Obtained results are compared with previous reported results in literature. A detailed analysis are done and it shows that the application of WDO yields improved numerical results in terms of thickness and oblique of wave implementation as compared with the earlier reported results. where, F I correspond to all forces acting on the air packets. ρ and a is the air density and acceleration of an air parcel respectively. The relation between pressure, density and temperature of the air packet are given as : P = ρrt, (3) where,t is temperature, R is the universal gas constant and P is pressure. Four major forces which describe the motion of air parcel has infinite volume (δv) are: Frictional Force (F f ), Gravitational Force (F g ), Pressure gradient force (F pg ), and Coriolis force (F c ) and can be described by following equations: F pg = PδV, () F f = ραu, (5) F g = ρδvg, (6) F c = 2Ωu, (7) where, α, u, g, and Ω are coefficient of friction, velocity vector of the wind, gravitational constant and rotation of earth respectively. These forces are incorporated in Equation (2) as ρ u = ρδvg + ( PδV) + ( 2Ω u) + ( ραu), (8) t Start Define the cost function (pressure), Population size and Boundary condition Initialize initial position, velocity of air parcel Evaluate pressure value for each air parcel WIND DRIVEN OPTIMIZATION TECHNIQUE The WDO algorithm is a new iterative, heuristic, population based global optimization technique which is proposed by Bayraktar [16]. Figure 1 shows the flow chart of WDO algorithm. The movement of wind in the earth s atmosphere to equalize horizontal imbalances in the air pressure leads to inspiration for WDO development. The velocity and position equations of air parcels are given as [16]. Update velocity using (9) Update position using (10) Max. Number of Iterations? No The pressure gradient ( P) over a distance is expressed as : The net force on the air packet is given as P = ( P x, P y, P z ). (1) Stop Yes Figure 1: Flow chart of WDO optimization technique ρa = F I, (2) 8017
3 For simplicity, considering time interval t=1 and acceleration α = u. Assuming δv =1, as the air parcel is t infinitesimally small and dimensionless. The velocity update equation is given by u new = (1 α)u cur gx cur + (RT 1 i 1 (x opt x cur )) + c u otherdim cur, (9) i where, i represent the rank of the particle in the population based on their pressure value at its location, c is a constant that represents the rotation of earth, and u cur, u new, x cur & x opt are initial velocity, new velocity, current position and optimum position respectively. The new position of air parcel is given by: x new = x cur + u new. (10) PHYSICAL MODEL OF MULTILAYER ABSORBER A generalized physical model [3] for N layer multilayer absorber with N-1 layers of substrate and N th layer as a Perfect Electric Conductor (PEC) is presented in Figure Incident Wave 0 3, 3 H(E), 0 1, 1 2, 2 E(H) K H(E) E(H) Reflected Wave d 1 d 2 d 3 for TE (perpendicular) polarization: ρ i,i+1 = μ i+1k i μ i k i+1 μ i+1 k i + μ i k i+1, i < N. (13) In the above equations, material layer is represented by i and their respective thickness by d i. ε i and μ i are complex permittivity and permeability of the i th layer material which depends on frequency respectively. According to Snell s Law, wave number (k i ) of i th layer material is defined by k i = 2πf μ i ε i μ 0 ε 0 sin 2 θ. (1) The reflection coefficient (R N,N+1) between the last substrate layer of the multilayer absorber and the PEC, is set to +1 or -1 for TM polarization and TE polarization. PROBLEM FORMULATION A complete process for synthesis of multilayer absorber includes searching a suitable configuration (number of layers) for a given frequency band and also to find suitable combination of materials from a given material data-base (Table 1). Having different type of materials in Table1, real and imaginary parts of permeability and permittivity for corresponding materials can be calculated using following formulae: For Lossy Magnetic Materials: μ (f) = μ (1GHz) f a, (15) μ (f) = μ (1GHz) f b. (16) For Lossy Dielectric Materials: ε (f) = ε (1GHz) f a, (17) ε (f) = ε (1GHz) f b. (18) N-1 N N+1 N 1, N 1 N, N PEC d N 1 d N For Relaxation-type Magnetic Materials: μ (f) = μ (f) = μ m f m 2 f 2 + f m 2, (19) μ m f m f f 2 + f m 2. (20) Figure 2: Generalized physical model of multilayer absorber The overall reflection coefficient between air and the microwave absorber can be calculated recursively using Chew s formula [2], given by R i,j+1 = ρ i,i+1 + R i+1,i+2 exp( 2jk i+1 d i+1 ) 1 + ρ i,i+1 R i+1,i+2 exp( 2jk i+1 d i+1 ), (11) where, for TM (parallel) polarization: ρ i,i+1 = ε i+1k i ε i k i+1 ε i+1 k i + ε i k i+1, i < N (12) Finally, the complex permittivity and permeability can be calculated as: Permittivity ε = (ε j ε ) ε 0, (21) Permeability μ = (μ j μ ) μ 0, (22) where, j stands for imaginary number 1, f denotes for frequency in GHz, a and b stand for decay constants, µ m and f m are also constants denoting mean permeability and mean frequency respectively. 8018
4 Table 1: Materials predefined date-base [10] *TM $ MN Per-mittivity Per-meability Constant Values ε ε μ μ a b μ m f m Lossless #DM Lossy **MM Lossy #DM Relax-ation type * TM = Types of material, $ MN = Material Number, # DM = Dielectric Material, ** MM=Magnetic Material As discussed earlier, to overcome a major drawback of optimal synthesis of the multilayer absorbers using optimization techniques, this paper propose a new cost function. The new cost function included both normal and oblique of wave up to wide angle of with TE and TM polarization simultaneously, and it is represented in (23). Min F = c 1 Max { N + c 2 di i=1 Max( R 0,1 (f) normal ), Max( R 0,1 (f) TE,θ ), Max( R 0,1 (f) TM,θ ), f B & θ theta (23) where, c 1 and c 2 are weighting factors emphasis to each of the term associated with it. di is the thickness of each layer. B is the desired frequency band in GHz and theta is set of angle of i.e theta = 15,30,5,60 degree. Hence, optimization includes wide angle of. R 0,1 is the reflection coefficient of multilayer structure in db at air and multilayer absorber interface. In the above equation (23), first } term R 0,1 (f) normal represents the reflection coefficient value for normal, where as second and third term R 0,1 (f) TE,θ and R 0,1 (f) TM,θ represents the reflection coefficient value for oblique (at angle θ) for TE and TM polarization respectively. The last term N i=1 di reflect the total thickness of N-layers multilayer absorber. For N-layers multilayer absorber synthesis, it is 2N dimensional optimization problem - N for material selection and N for their corresponding thickness. NUMERICAL RESULTS In this paper, six different models ( 1 6) of multilayer microwave absorbers are considered for different popular frequency bands. The synthesis of all the proposed models is carried out by WDO optimization technique to get optimum thickness for each layer of material through the minimization of cost function given in (23). Synthesis of each model is done after performing 30 independent trials and best among them is taken as final result. 8019
5 The minimum and maximum values of individual layer thickness are set to 0.1mm and 2mm respectively [10]. Bandwidth B has been taken accordingly for each new model with frequency increment of 0.25GHz. Incidence angles theta value is taken as 15,30,5,60 degrees. The constants c 1 and c 2 are 2 and 1000 respectively. Various parameters of WDO optimization taken are as follow: RT =0.5, g = 0.1, α = 0.1, c = 0.3, population size = 30. The values of constants are so chosen to experimentally provide the best result for each case. The maximum number of iteration is set to Detailed discussion of the simulation results are expressed below. Table 2 illustrates the comparative study of multilayer absorber having different number of layers. This comparative study is necessary to compare and find best -model (number of layers) for each proposed model (model 1, model 2, model 3, model, model 5 and model 6) which have been synthesized for different popular frequency bands ( , 2 8, 8 12, 12 18, 2 18 and GHz respectively). Thus, obtained winner for each model is depicted in last row of table. Figure 3 to Figure 8 illustrates reflection coefficient versus different angle of and polarization of model 1 frequency curves for each of the proposed model. All figures contain nine curves each one for normal of wave and eight for oblique of wave (varying from 15 degree to 60 degree taking step size of 15 degree for both TE and TM polarization). Tables 3,,5,6,7 and 8 depict the comparison for each of the proposed models with other respective models reported in literatures. Proposed s Band (GHz) 9 Table 2: Comparative study for different layers for synthesis of multilayer absorber 1 * MN 1,, 2, 1, 5,, 1, 2, , 7, 6, 6, 9, 1, 7, 1,12 13, 8, 8, 1, 7, 1, 1, 6, 6, 9, 8, 7, 8, 1, 8, 3, 1 1, 6, 3, 2, 5,, 1, 1, 5 6,, 8, 7,1,, 6,, 1 # TT $ MR * MN 1, 5, 5, 1, 2,, 1, 6, 5, 5, 1, 1, 9 8, 8, 7, 1, 1, 5, 8 11, 6, 5, 8, 7,, 1 16, 6, 1, 9, 5, 5, 6, 1, 7, 8, 1, 1, 3 # TT $ MR * MN 16, 3,, 5, 1, 6, 1, 9, 1,, 5, 8, 9 1, 8, 1, 1, 1 1, 6, 6, 11, 9 1, 6, 9 7, 1 # TT $ MR * MN 1, 3, 2, 16, 2, 13, 9 1, 8, 8, 8 16, 1, 8, 2 16, 8, 6, 15 6, 9,6 6 # TT $ MR * MN 16, 5, 1, 9, 3 16, 8, 6 1, 8, 5 1, 6, 9 11, 7, 3 # TT $ MR Winner # TT=Total thickness (in mm), * MN = Material Number in order (Top layer to bottom layer), $ MR = Maximum reflection coefficient up to 60 0 oblique of waves with TE/TM. 8020
6 Figure 3: coefficient versus frequency under different angle of and polarization of model 1 Figure 6: coefficient versus frequency under different angle of and polarization of model Table 3 shows the comparative results of model 1 ed for frequency band GHz with other respective models reported in [1] having nearly same frequency band GHz. The obtained total thickness of model 1 is 3.675mm as compared to.23mm and.19mm for respective models in [1]. It depicts that proposed model 1 for three layers of a different combination of materials has less total thickness as compared to that of models in [1]. It also guarantees the maximum reflection coefficient value of 8.96 db up to 60 degree for oblique. Hence, proposed model 1 performs better than other corresponding models reported [1] Figure : coefficient versus frequency under different angle of and polarization of model 2 Figure 5: coefficient versus frequency under different angle of and polarization of model 3 Figure 7: coefficient versus frequency under different angle of and polarization of model
7 Figure 8: coefficient versus frequency under different angle of and polarization of model Ground Plane PEC - PEC - PEC - Total thickness (mm) co- efficient (db) Frequency band (GHz) Normal Oblique (θmax=60 0 ) TE &TM Oblique consideration Max Min Max & Min -9.3 & Yes No No Optimization Technique WDO DE PSO # TH=Thickness (in mm), * MN = Material Number Table 3: parameter of model 1 s 1 Data from [1] (Number of ) 3- layer 3- layer Data from [1] 3- layer Number * MN # TH * MN # TH * MN # TH Ground Plane PEC - PEC - PEC - Total thickness (mm) Frequency band (GHz) co- efficient (db) Normal Oblique (θmax=60 0 ) TE &TM Oblique consideration Max Min Max & Min & Yes No No Optimization Technique WDO SPA SPA # TH=Thickness (in mm), * MN = Material Number Table : parameter of model 2 s 2 Data from [10] (Number of ) - layer 5- layers Data from [11] - layers Number * MN # TH * MN # TH * MN # TH in terms of total thickness and inclusion of oblique of waves. Table shows the comparative results of model 2 with other respective models reported in [10] and [11]. The obtained total thickness of model 2 is mm as compared to.86mm in [10] and 3.8mm in [11]. It depicts that model 2 for four layers of different combination of materials has less total thickness as compare to five layers in [10] and four layer in [11]. It also guarantees the maximum reflection coefficient value of 8.36 db up to 60 degree of oblique of waves. Hence, proposed model 2 performs better than other corresponding models reported in [10] and [11] in terms of total thickness and inclusion of oblique of wave. Table 5 shows the comparative results of model 3 with other respective models reported in [7] and [11]. The obtained total thickness of model 3 is 1.190mm as compared to.1933mm in [7] and mm in [11]. It reveals that proposed model 3 having three layers, has less total thickness as compared to four layer of [7] and [11]. It ascertains maximum reflection coefficient value of -9.9 db up to 60 degree of oblique of wave. Hence, proposed model 3 performs better than other corresponding models reported in [7] and [11] in terms of thickness and oblique of wave. Table 6 shows the comparative results of model for with other respective models reported in [7] and [11]. The obtained total thickness is 1.26mm as compared to mm in [7] and 2.908mm in [11]. It depicts that proposed model 5 for four layers of different combination of materials has less total thickness as compared to in [6] and in [11]. It also ensures maximum reflection coefficient value of -9.67dB 8022
8 co- efficient (db) Table 5: parameter of model 3 s 3 Data from [7] (Number of ) 3- layer - layers Data from [11] - layers Number * MN # TH * MN # TH * MN # TH Ground Plane PEC - PEC - PEC - Total thickness (mm) Frequency band (GHz) Normal Oblique (θ max=60 0 ) TE &TM Oblique consideration Max Min Max -9.9 & Min & Yes No No Optimization Technique WDO GA PSO #TH=Thickness (in mm), *MN = Material Number co- efficient (db) Table 7: parameter of model 5 s 5 Data from [10] (Number of ) - layer - layers Data from [11] - layers Number * MN # TH * MN # TH * MN # TH Ground Plane PEC - PEC - PEC - Total thickness (mm) Frequency band (GHz) Normal Oblique (θ max=60 0 ) TE &TM Oblique consideration Max Min Max & & Min & & Yes Yes No Optimization Technique WDO DE PSO # TH=Thickness (in mm), * MN = Material Number co- efficient (db) Table 6: parameter of model s Data from [7] (Number of ) - layer - layers Data from [11] - layers Number * MN # TH * MN # TH * MN # TH Ground Plane PEC - PEC - PEC - Total thickness (mm) Frequency band (GHz) Normal Oblique (θ max=60 0 ) TE &TM Oblique consideration Max Min Max & Min & Yes No No Optimization Technique WDO GA PSO # TH=Thickness (in mm), * MN = Material Number up to 60 degree of oblique of wave. Hence, proposed model performs better than respective models in co- efficient (db) Table 8: parameter of model 6 6 (Number of ) Number 7- layer Material Number Thickness (in mm) Ground Plane PEC - Total thickness (mm).3 Frequency band(ghz) Normal Max Oblique (θmax=60 0 ) TE &TM Oblique consideration Min Max & Min & Yes Optimization Technique WDO [7] and [11] in terms of thickness and oblique of wave. 8023
9 Table 7 shows the comparative results of model 5 for with other respective models reported in [10] and [11]. The obtained total thickness is 3.7mm as compared to.6mm in [10] and 3.03mm in [11]. It depicts that proposed model 5 for four layers of different combination of materials has less total thickness as compared to [10] but greater than that of in [11]. It ensures maximum reflection coefficient value of -8.36dB up to 60 degree of oblique of wave. Hence, proposed model performs better than model in [10] in terms of total thickness and model in [11] in terms of oblique of wave. The parameter of the proposed model 6 is described in Table 8. The frequency band of this model is significant in recent development of 5G communication system and many other applications. However, this model (multilayer absorber) is not found in literature till date, to the best of our knowledge and so comparative results could not be established. But, the results obtained are very encouraging. Total thickness of.3mm was achieved, guarantying a maximum reflection coefficient value of 12.92dB up to 60 degree of oblique of wave. Figure 9 summarizes the convergence curves of cost function value over iterations for synthesis of models 1 6 carried out by WDO optimization technique. All models converges before 2500 th iterations. Figure 9: Convergence curves of cost function value over iterations for synthesis of models 1 6 carried out by WDO optimization technique. CONCLUSIONS This paper has presented the optimal of four layer multilayer microwave absorbers using WDO technique. The previous works reported so far have used cost-function that did not take into account all the cases of of wave. The optimization was achieved only for a particular case of of wave and polarization, whereas practically wave can be incident at any angle of and polarization. Therefore, a new cost function is proposed to implement the optimization problem for wide range angle to enhance its versatility. Here, six different improved models ( 1 6) have been presented for various popular frequency bands. Most importantly, all the models have been analyzed for both TE and TM polarization under normal and oblique of wave from 0 to 60 degree. Different configuration of layers such as 9-layer, 7-layer, 5-layer, - layer and 3-layer are considered for each model and the best configuration is selected as winner. Obtained numerical optimal results obtained in terms of normal of wave and thickness are compared with earlier published results and found to be improved. REFERENCES [1] Dixon, Paul, Theory and Application of RF/Microwave Absorbers, Techn. Ber. Emerson & Cuming Microwave Products, [2] Chew, W. C, Waves and Fields in Inhomogeneous Media, IEEE Press, NY, [3] Michielssen, E., J. Sajer, S. Ranjithan, and R. Mittra, of lightweight, broad-band microwave absorbers using genetic algorithms, IEEE Trans. on Microwave Theory and Techniques, 1, pp , 1993,. [] Weile, D., E. Michielssen, and D. Goldberg, Genetic algorithm of pareto optimal broadband microwave absorbers, IEEE Trans. on Electromagnetic Compatibility, 38, pp , [5] Kern, D. J. and D. H. Werner, A genetic algorithm approach to the of ultrathin electromagnetic bandgap absorbers, Microwave and Opt. Tech. Letters, 38, pp. 61 6, [6] Kent, Sedef, and Mesut Kartal, Dielectric absorber for wide band wide oblique angle using genetic algorithm, AEU-International Journal of Electronics and Communications, 61.6, pp , [7] Jiang, L., J. Cui, L. Shi, and X. Li, Pareto optimal of multilayer microwave absorbers for wide-angle using genetic algorithms, IET Microw. Antennas Propagation, 3, pp , [8] Goudos, S., of microwave broadband absorbers using a self-adaptive differential evolution algorithm, Int. J. RF and Microwave CAE, 19, pp , [9] Asi, M. J. and N. I. Dib, of multilayer microwave broadband absorbers using central force optimization, Progress In Electromagnetic Research B, 26, pp ,
10 [10] Dib, N., M. Asi, and A. Sabbah, On the optimal of multilayer microwave absorbers, Progress In Electromagnetics Research C, 13, pp , [11] Roy, Subhanwit, et al, Particle swarm optimization for optimal of broadband multilayer microwave absorber for wide angle of, Progress In Electromagnetics Research B, 62, , [12] Chamaani, S., S. A. Mirtaheri, M. Teshnehlab, M. A. Shoorehdeli and V. Seydi, Modified multi-objective particle swarm optimization for electromagnetic absorber, Progress In Electromagnetics Research, 79, pp , [13] Liu, H., L. Zhang, Y. Gao, Y. Shen, and D. Shi, Electromagnetic wave absorber optimal based on improved particle swarm optimization, EMC 2009, IEICE, Kyoto, pp , [1] García, Edgar, Iván Amaya, and Rodrigo Correa, of an optimal multilayer electromagnetic absorber through Spiral Algorithm, Ingeniería Universidad, 20.1, pp , [15] Roy, Subhanwit, et al, Comparison of Evolutionary Algorithms for Optimal of Broadband Multilayer Microwave Absorber for Normal and Oblique Incidence, Applied Computational Electromagnetics Society Journal, 31.1, [16] Bayraktar, Zikri, MugeKomurcu, and Douglas H. Werner, Wind Driven Optimization (WDO): A novel nature-inspired optimization algorithm and its application to electromagnetic, Antennas and Propagation Society International Symposium (APSURSI), IEEE, [17] Santosh Kumar Mahto, Arvind Choubey, and Sushmita Suman, Linear array synthesis with minimum side lobe level and null control using wind driven optimization, 2015 International Conference on Signal Processing And Communication Engineering Systems (SPACES), IEEE, [18] Rashmi Sinha, Arvind Choubey, and Santosh kumar Mahto, A Novel Efficient Transversal Channel Equalizer based on Nature Inspired Wind Driven Optimization (WDO) Technique, International journal of revistakasmera,, [19] Boulesnane, Abdennour, and Souham Meshoul, A New Multi-region Modified Wind Driven Optimization Algorithm with Collision Avoidance for Dynamic Environments, Advances in Swarm Intelligence, Springer International Publishing, pp , 201. [20] Santosh Kumar Mahto, and Arvind Choubey, A novel hybrid IWO/WDO algorithm for interference minimization of uniformly excited linear sparse array by position-only control, IEEE Antennas and Wireless Propagation letters 15, pp , [21] Santosh Kumar Mahto, and Arvind Choubey, A Novel Hybrid IWO/WDO Algorithm for Nulling Pattern Synthesis of Uniformly Spaced Linear and Non-uniform Circular Array Antenna, AEU International Journal of Electronics and Communications, Elsevier,
DESIGN OF MULTILAYER MICROWAVE BROADBAND ABSORBERS USING CENTRAL FORCE OPTIMIZATION
Progress In Electromagnetics Research B, Vol. 26, 101 113, 2010 DESIGN OF MULTILAYER MICROWAVE BROADBAND ABSORBERS USING CENTRAL FORCE OPTIMIZATION M. J. Asi and N. I. Dib Department of Electrical Engineering
More informationDesign of Multilayer Microwave Absorbers Using Hybrid Binary Lightning Search Algorithm and Simulated Annealing
Progress In Electromagnetics Research B, Vol. 78, 75 90, 2017 Design of Multilayer Microwave Absorbers Using Hybrid Binary Lightning Search Algorithm and Simulated Annealing Yuting Lu 1 and Yongquan Zhou2,
More informationDiseño óptimo de absorbedores electromagnéticos multicapa para frecuencias en el rango de 0,85-5,4 GHz
SECCIÓN TÉCNICA 0.85 GHz and 5. GHz Diseño óptimo de absorbedores electromagnéticos multicapa para frecuencias en el rango de 0,85-5, GHz Iván Amaya (), Rodrigo Correa (2) () Ph.D (c) on Engineering, Universidad
More informationDesign of a Non-uniform High Impedance Surface for a Low Profile Antenna
352 Progress In Electromagnetics Research Symposium 2006, Cambridge, USA, March 26-29 Design of a Non-uniform High Impedance Surface for a Low Profile Antenna M. Hosseini 2, A. Pirhadi 1,2, and M. Hakkak
More informationELECTROMAGNETIC INTERFERENCE (EMI) ANALYSIS FOR OBLIQUE INCIDENCE OF EM WAVES IN DOUBLE SHIELDS
International Journal of Electronics and Communication Engineering & Technology (IJECET) Volume 6, Issue 11, Nov 2015, pp. 01-09, Article ID: IJECET_06_11_001 Available online at http://www.iaeme.com/ijecetissues.asp?jtype=ijecet&vtype=6&itype=11
More informationFull Wave Analysis of RF Signal Attenuation in a Lossy Rough Surface Cave Using a High Order Time Domain Vector Finite Element Method
Progress In Electromagnetics Research Symposium 2006, Cambridge, USA, March 26-29 425 Full Wave Analysis of RF Signal Attenuation in a Lossy Rough Surface Cave Using a High Order Time Domain Vector Finite
More informationSTUDY ON THE PROPERTIES OF SURFACE WAVES IN COATED RAM LAYERS AND MONO-STATIC RCSR PERFORMANCES OF A COATED SLAB
Progress In Electromagnetics Research M, Vol. 11, 13 13, 1 STUDY ON THE PROPERTIES OF SURFACE WAVES IN COATED RAM LAYERS AND MONO-STATIC RCSR PERFORMANCES OF A COATED SLAB H. Y. Chen, P. H. Zhou, L. Chen,
More informationAPPLICATION OF BILAYER ANISOTROPIC STRUC- TURES FOR DESIGNING LOW-PASS FILTERS AND PO- LARIZERS
Progress In Electromagnetics Research M, Vol. 29, 95 108, 2013 APPLICATION OF BILAYER ANISOTROPIC STRUC- TURES FOR DESIGNING LOW-PASS FILTERS AND PO- LARIZERS Amir Raeesi *, Ali Abdolali, and Hossein Mirzaei
More informationSuprabhat Vishwakarma 1, Bimal garg 2 1 Student, 2 Associate Professor. Electronics Department, Mitsgwalior (m.p.) India.
A L-Band Rectangular Shape Inside a Pentagon Metamaterial Structure for Microwave Application Suprabhat Vishwakarma 1, Bimal garg 2 1 Student, 2 Associate Professor Electronics Department, Mitsgwalior
More informationDesign of a Metafilm-composite Dielectric Shielding Structure Using a Genetic Algorithm
Design of a Metafilm-composite Dielectric Shielding Structure Using a Genetic Algorithm J. Y. Huang, M. Y. Koledintseva, P. C. Rva, J. L. Drewniak R. E. DuBroff, B. Archambeault 2, and K. N. Rozanov 3
More informationDesign and Characterization of a Dual-Band Metamaterial Absorber Based on Destructive Interferences
Progress In Electromagnetics Research C, Vol. 47, 95, 24 Design and Characterization of a Dual-Band Metamaterial Absorber Based on Destructive Interferences Saeid Jamilan, *, Mohammad N. Azarmanesh, and
More informationDESIGN AND OPTIMIZATION OF EQUAL SPLIT BROADBAND MICROSTRIP WILKINSON POWER DI- VIDER USING ENHANCED PARTICLE SWARM OPTI- MIZATION ALGORITHM
Progress In Electromagnetics Research, Vol. 118, 321 334, 2011 DESIGN AND OPTIMIZATION OF EQUAL SPLIT BROADBAND MICROSTRIP WILKINSON POWER DI- VIDER USING ENHANCED PARTICLE SWARM OPTI- MIZATION ALGORITHM
More informationSYNTHESIS OF MICROWAVE RESONATOR DIPLEX- ERS USING LINEAR FREQUENCY TRANSFORMATION AND OPTIMIZATION
Progress In Electromagnetics Research, Vol. 24, 44 4, 22 SYNTHESIS OF MICROWAVE RESONATOR DIPLEX- ERS USING LINEAR FREQUENCY TRANSFORMATION AND OPTIMIZATION R. Wang *, J. Xu, M.-Y. Wang, and Y.-L. Dong
More informationELECTROMAGNETIC SCATTERING FROM A CHIRAL- COATED NIHILITY CYLINDER
Progress In Electromagnetics Research Letters, Vol. 18, 41 5, 21 ELECTROMAGNETIC SCATTERING FROM A CHIRAL- COATED NIHILITY CYLINDER S. Ahmed and Q. A. Naqvi Department of Electronics Quaid-i-Azam University
More informationNumerical Analysis of Electromagnetic Fields in Multiscale Model
Commun. Theor. Phys. 63 (205) 505 509 Vol. 63, No. 4, April, 205 Numerical Analysis of Electromagnetic Fields in Multiscale Model MA Ji ( ), FANG Guang-You (ྠ), and JI Yi-Cai (Π) Key Laboratory of Electromagnetic
More informationON THE USE OF RANDOM VARIABLES IN PARTICLE SWARM OPTIMIZATIONS: A COMPARATIVE STUDY OF GAUSSIAN AND UNIFORM DISTRIBUTIONS
J. of Electromagn. Waves and Appl., Vol. 23, 711 721, 2009 ON THE USE OF RANDOM VARIABLES IN PARTICLE SWARM OPTIMIZATIONS: A COMPARATIVE STUDY OF GAUSSIAN AND UNIFORM DISTRIBUTIONS L. Zhang, F. Yang, and
More informationJ.-C. Zhang, Y.-Z. Yin, and J.-P. Ma National Laboratory of Antennas and Microwave Technology Xidian University Xi an, Shaanxi , P. R.
Progress In Electromagnetics Research Letters, Vol. 6, 55 60, 2009 MULTIFUNCTIONAL MEANDER LINE POLARIZER J.-C. Zhang, Y.-Z. Yin, and J.-P. Ma National Laboratory of Antennas and Microwave Technology Xidian
More informationStudy of Specific Absorption Rate (SAR) in the human head by metamaterial attachment
Study of Specific Absorption Rate (SAR) in the human head by metamaterial attachment M. T Islam 1a), M. R. I. Faruque 2b), and N. Misran 1,2c) 1 Institute of Space Science (ANGKASA), Universiti Kebangsaan
More informationA Novel Single-Source Surface Integral Method to Compute Scattering from Dielectric Objects
SUBMITTED TO IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS ON NOVEMBER 18, 2016 1 A Novel Single-Source Surface Integral Method to Compute Scattering from Dielectric Objects Utkarsh R. Patel, Student
More informationCOLLOCATED SIBC-FDTD METHOD FOR COATED CONDUCTORS AT OBLIQUE INCIDENCE
Progress In Electromagnetics Research M, Vol. 3, 239 252, 213 COLLOCATED SIBC-FDTD METHOD FOR COATED CONDUCTORS AT OBLIQUE INCIDENCE Lijuan Shi 1, 3, Lixia Yang 2, *, Hui Ma 2, and Jianning Ding 3 1 School
More informationUltra-Broad Band Radar Cross Section Reduction of Waveguide Slot Antenna with Metamaterials
RADIOENGINEERING, VOL. 25, NO. 2, JUNE 216 241 Ultra-Broad Band Radar Cross Section Reduction of Waveguide Slot Antenna with Metamaterials Qiang FU 1, Cheng-Li FAN 1, Si-Jia LI 2, Gang WANG 1, Xiang-Yu
More informationOn the physical limit of radar absorbers
On the physical limit of radar absorbers Karlsson, Anders; Kazemzadeh, Alireza Published: 21-1-1 Link to publication Citation for published version (APA): Karlsson, A., & Kazemzadeh, A. (21). On the physical
More informationTechnique for the electric and magnetic parameter measurement of powdered materials
Computational Methods and Experimental Measurements XIV 41 Technique for the electric and magnetic parameter measurement of powdered materials R. Kubacki,. Nowosielski & R. Przesmycki Faculty of Electronics,
More informationA Broadband Flexible Metamaterial Absorber Based on Double Resonance
Progress In Electromagnetics Research Letters, Vol. 46, 73 78, 2014 A Broadband Flexible Metamaterial Absorber Based on Double Resonance ong-min Lee* Abstract We present a broadband microwave metamaterial
More informationResonances and dipole moments in dielectric, magnetic, and magnetodielectric cylinders an overview
Appl Phys A (2011) 103: 789 793 DOI 10.1007/s00339-010-6219-6 Resonances and dipole moments in dielectric, magnetic, and magnetodielectric cylinders an overview A. Dirksen S. Arslanagic O. Breinbjerg Received:
More informationEFFICIENT SIMULATIONS OF PERIODIC STRUC- TURES WITH OBLIQUE INCIDENCE USING DIRECT SPECTRAL FDTD METHOD
Progress In Electromagnetics Research M, Vol. 17, 101 111, 2011 EFFICIENT SIMULATIONS OF PERIODIC STRUC- TURES WITH OBLIQUE INCIDENCE USING DIRECT SPECTRAL FDTD METHOD Y. J. Zhou, X. Y. Zhou, and T. J.
More informationAnalysis of Metamaterial Cloaks Using Circular Split Ring Resonator Structures
Copyright 216 Tech Science Press CMC, Vol.53, No.3, pp.132-14, 216 Analysis of Metamaterial Cloaks Using Circular Split Ring Resonator Structures Susan Thomas 1 and Dr. Balamati Choudhury 2 Abstract A
More informationProgress In Electromagnetics Research, PIER 52, , 2005 FDTD ANALYSIS OF MICROSTRIP PATCH ANTENNA COVERED BY PLASMA SHEATH
Progress In Electromagnetics Research, PIER 52, 173 183, 25 FDTD ANALYSIS OF MICROSTRIP PATCH ANTENNA COVERED BY PLASMA SHEATH Z. H. Qian and R. S. Chen Department of Communication Engineering Nanjing
More informationNew Scaling Factors of 2-D Isotropic-Dispersion Finite Difference Time Domain (ID-FDTD) Algorithm for Lossy Media
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 56, NO., FEBRUARY 8 63 is shown by squares. Each point is computed by averaging reflection coefficient values calculated for each component of the regular
More informationEffects from the Thin Metallic Substrate Sandwiched in Planar Multilayer Microstrip Lines
Progress In Electromagnetics Research Symposium 2006, Cambridge, USA, March 26-29 115 Effects from the Thin Metallic Substrate Sandwiched in Planar Multilayer Microstrip Lines L. Zhang and J. M. Song Iowa
More informationEfficiency and Bandwidth Improvement Using Metamaterial of Microstrip Patch Antenna
Efficiency and Bandwidth Improvement Using Metamaterial of Microstrip Patch Antenna Aakash Mithari 1, Uday Patil 2 1Student Department of Electronics Technology Engg., Shivaji University, Kolhapur, Maharashtra,
More informationELECTROMAGNETIC WAVE SCATTERING FROM CY- LINDRICAL STRUCTURE WITH MIXED-IMPEDANCE BOUNDARY CONDITIONS
Progress In Electromagnetics Research M, Vol. 9, 7, 13 ELECTROMAGNETIC WAVE SCATTERING FROM CY- LINDRICAL STRUCTURE WITH MIXED-IMPEDANCE BOUNDARY CONDITIONS Mostafa Mashhadi *, Ali Abdolali, and Nader
More informationTHE SCATTERING FROM AN ELLIPTIC CYLINDER IRRADIATED BY AN ELECTROMAGNETIC WAVE WITH ARBITRARY DIRECTION AND POLARIZATION
Progress In Electromagnetics Research Letters, Vol. 5, 137 149, 2008 THE SCATTERING FROM AN ELLIPTIC CYLINDER IRRADIATED BY AN ELECTROMAGNETIC WAVE WITH ARBITRARY DIRECTION AND POLARIZATION Y.-L. Li, M.-J.
More informationResearch on the Wide-angle and Broadband 2D Photonic Crystal Polarization Splitter
Progress In Electromagnetics Research Symposium 2005, Hangzhou, China, August 22-26 551 Research on the Wide-angle and Broadband 2D Photonic Crystal Polarization Splitter Y. Y. Li, P. F. Gu, M. Y. Li,
More informationANALYSIS OF PLANAR MULTILAYER STRUCTURES AT OBLIQUE INCIDENCE USING AN EQUIVALENT BCITL MODEL
Progress In Electromagnetics Research C, Vol. 4, 13 24, 2008 ANALYSIS OF PLANAR MULTILAYER STRUCTURES AT OBLIQUE INCIDENCE USING AN EQUIVALENT BCITL MODEL D. Torrungrueng and S. Lamultree Department of
More informationTHE total-field/scattered-field (TFSF) boundary, first proposed
454 IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 5, 2006 Analytic Field Propagation TFSF Boundary for FDTD Problems Involving Planar Interfaces: Lossy Material and Evanescent Fields Kakhkhor Abdijalilov
More informationProgress In Electromagnetics Research M, Vol. 20, 81 94, 2011
Progress In Electromagnetics Research M, Vol. 2, 8 94, 2 PHOTONIC BAND STRUCTURES AND ENHANCE- MENT OF OMNIDIRECTIONAL REFLECTION BANDS BY USING A TERNARY D PHOTONIC CRYSTAL IN- CLUDING LEFT-HANDED MATERIALS
More informationProgress In Electromagnetics Research B, Vol. 1, , 2008
Progress In Electromagnetics Research B Vol. 1 09 18 008 DIFFRACTION EFFICIENCY ENHANCEMENT OF GUIDED OPTICAL WAVES BY MAGNETOSTATIC FORWARD VOLUME WAVES IN THE YTTRIUM-IRON-GARNET WAVEGUIDE COATED WITH
More informationOne-Dimensional Numerical Solution of the Maxwell-Minkowski Equations
Tamkang Journal of Science and Engineering, Vol. 12, No. 2, pp. 161168 (2009) 161 One-Dimensional Numerical Solution of the Maxwell-Minkowski Equations Mingtsu Ho 1 and Yao-Han Chen 2 1 Department of Electronic
More informationFINITE-DIFFERENCE FREQUENCY-DOMAIN ANALYSIS OF NOVEL PHOTONIC
FINITE-DIFFERENCE FREQUENCY-DOMAIN ANALYSIS OF NOVEL PHOTONIC WAVEGUIDES Chin-ping Yu (1) and Hung-chun Chang (2) (1) Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei,
More informationFull-Wave Analysis of Anisotropic Circular Microstrip Antenna with Air Gap Layer
Progress In Electromagnetics Research M, Vol. 34, 143 151, 214 Full-Wave Analysis of Anisotropic Circular Microstrip Antenna with Air Gap Layer Sami Bedra 1, *, Randa Bedra 1, Siham Benkouda 2, and Tarek
More informationTheoretical study of two-element array of equilateral triangular patch microstrip antenna on ferrite substrate
PRAMANA c Indian Academy of Sciences Vol. 65, No. 3 journal of September 2005 physics pp. 501 512 Theoretical study of two-element array of equilateral triangular patch microstrip antenna on ferrite substrate
More informationEffects of Loss Factor on Plane Wave Propagation through a Left-Handed Material Slab
Vol. 113 (2008) ACTA PHYSICA POLONICA A No. 6 Effects of Loss Factor on Plane Wave Propagation through a Left-Handed Material Slab C. Sabah Electrical and Electronics Engineering Department, University
More informationβi β r medium 1 θ i θ r y θ t β t
W.C.Chew ECE 350 Lecture Notes Date:November 7, 997 0. Reections and Refractions of Plane Waves. Hr Ei Hi βi β r Er medium θ i θ r μ, ε y θ t μ, ε medium x z Ht β t Et Perpendicular Case (Transverse Electric
More informationProgress In Electromagnetics Research Letters, Vol. 17, , 2010
Progress In Electromagnetics Research Letters, Vol. 17, 163 170, 2010 MINIATURE ELECTROMAGNETIC BAND-GAP STRUCTURE USING SPIRAL GROUND PLANE H.-H. Xie, Y.-C. Jiao, K. Song, and B. Yang National Key Laboratory
More informationElectromagnetic Scattering from a PEC Wedge Capped with Cylindrical Layers with Dielectric and Conductive Properties
0. OZTURK, ET AL., ELECTROMAGNETIC SCATTERING FROM A PEC WEDGE CAPPED WIT CYLINDRICAL LAYERS... Electromagnetic Scattering from a PEC Wedge Capped with Cylindrical Layers with Dielectric and Conductive
More informationHigh Directivity Horn Antenna of Metamaterial in Terahertz Xiangjin Quan, Shiquan Zhang, Hui Li
International Power, Electronics and Materials Engineering Conference (IPEMEC 215) High Directivity Horn Antenna of Metamaterial in Terahertz Xiangjin Quan, Shiquan Zhang, Hui Li Engineering University
More informationProgress In Electromagnetics Research B, Vol. 36, , 2012
Progress In Electromagnetics Research B, Vol. 36, 113 131, 2012 DESIGN OF A FULLY DIGITAL CONTROLLED RECON- FIGURABLE SWITCHED BEAM CONCENTRIC RING ARRAY ANTENNA USING FIREFLY AND PARTICLE SWARM OPTIMIZATION
More informationEQUIVALENT CIRCUIT MODEL FOR ANALYSIS OF INHOMOGENEOUS GRATINGS
Progress In Electromagnetics Research, PIER 69, 21 34, 2007 EQUIVALENT CIRCUIT MODEL FOR ANALYSIS OF INHOMOGENEOUS GRATINGS M. Khalaj-Amirhosseini College of Electrical Engineering Iran University of Science
More informationTHEORETICAL EXAMINATION OF ELECTROMAG- NETIC WAVE TUNNELING THROUGH CASCADED ɛ-
Progress In Electromagnetics Research B, Vol. 4, 1, 01 THEORETICAL EXAMINATION OF ELECTROMAG- NETIC WAVE TUNNELING THROUGH CASCADED ɛ- AND µ-negative METAMATERIAL SLABS C. H. Liu * and N. Behdad Department
More informationB. H. Jung Department of Information and Communication Engineering Hoseo University Asan, Chungnam , Korea
Progress In Electromagnetics Research, PIER 77, 111 120, 2007 ANALYSIS OF TRANSIENT ELECTROMAGNETIC SCATTERING WITH PLANE WAVE INCIDENCE USING MOD-FDM B. H. Jung Department of Information and Communication
More informationEvaluation of the Sacttering Matrix of Flat Dipoles Embedded in Multilayer Structures
PIERS ONLINE, VOL. 4, NO. 5, 2008 536 Evaluation of the Sacttering Matrix of Flat Dipoles Embedded in Multilayer Structures S. J. S. Sant Anna 1, 2, J. C. da S. Lacava 2, and D. Fernandes 2 1 Instituto
More informationMicrostrip Coupler with Complementary Split-Ring Resonator (CSRR)
Microstrip Coupler with Complementary Split-Ring Resonator (CSRR) E-242 Course Project Report Submitted by, EMIL MATHEW JOSEPH 4810-411-091-07049 Guided by, Prof. K J VINOY Department of Electrical and
More informationQuasi-static Vertical Magnetic Field of a Large Horizontal Circular Loop Located at the Earth s Surface
Progress In Electromagnetics Research Letters, Vol. 6, 9 34, 16 Quasi-static Vertical Magnetic Field of a Large Horizontal Circular Loop Located at the Earth s Surface Mauro Parise * Abstract In this work,
More informationMicrowave Phase Shift Using Ferrite Filled Waveguide Below Cutoff
Microwave Phase Shift Using Ferrite Filled Waveguide Below Cutoff CHARLES R. BOYD, JR. Microwave Applications Group, Santa Maria, California, U. S. A. ABSTRACT Unlike conventional waveguides, lossless
More informationA multi-channel omnidirectional tunable filter in one-dimensional tilted ternary plasma photonic crystal
JOURNAL OF INTENSE PULSED LASERS AND APPLICATIONS IN ADVANCED PHYSICS Vol. 4, No. 3, 4, p. 45-54 A multi-channel omnidirectional tunable filter in one-dimensional tilted ternary plasma photonic crystal
More informationA GENERALIZED COUPLED-LINE DUAL-BAND WILKINSON POWER DIVIDER WITH EXTENDED PORTS
Progress In Electromagnetics Research, Vol. 19, 197 14, 1 A GENERALIZED COUPLED-LINE DUAL-BAND WILKINSON POWER DIVIDER WITH EXTENDED PORTS J. C. Li *, Y. L. Wu, Y. A. Liu, J. Y. Shen, S. L. Li, and C.
More informationRESONANCE FREQUENCIES AND FAR FIELD PATTERNS OF ELLIPTICAL DIELECTRIC RESONATOR ANTENNA: ANALYTICAL APPROACH
Progress In Electromagnetics Research, PIER 64, 81 98, 2006 RESONANCE FREQUENCIES AND FAR FIELD PATTERNS OF ELLIPTICAL DIELECTRIC RESONATOR ANTENNA: ANALYTICAL APPROACH A. Tadjalli and A. Sebak ECE Dept,
More informationTECHNO INDIA BATANAGAR
TECHNO INDIA BATANAGAR ( DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING) QUESTION BANK- 2018 1.Vector Calculus Assistant Professor 9432183958.mukherjee@tib.edu.in 1. When the operator operates on
More informationCLOSED-FORM DESIGN METHOD OF AN N-WAY DUAL-BAND WILKINSON HYBRID POWER DIVIDER
Progress In Electromagnetics Research, PIER 101, 97 114, 2010 CLOSED-FORM DESIGN METHOD OF AN N-WAY DUAL-BAND WILKINSON HYBRID POWER DIVIDER Y. L. Wu, Y. A. Liu, S. L. Li, C. P. Yu, and X. Liu School of
More informationELECTROMAGNETIC FIELDS AND WAVES
ELECTROMAGNETIC FIELDS AND WAVES MAGDY F. ISKANDER Professor of Electrical Engineering University of Utah Englewood Cliffs, New Jersey 07632 CONTENTS PREFACE VECTOR ANALYSIS AND MAXWELL'S EQUATIONS IN
More informationValidity of PEC Approximation for On-Body Propagation
Downloaded from orbit.dtu.dk on: Nov, 208 Validity of PEC Approximation for On-Body Propagation Kammersgaard, Nikolaj Peter Brunvoll; Kvist, Søren Helstrup; Thaysen, Jesper; Jakobsen, Kaj Bjarne Published
More informationM. Rattan Department of Electronics and Communication Engineering Guru Nanak Dev Engineering College Ludhiana, Punjab, India
Progress In Electromagnetics Research M, Vol. 2, 131 139, 2008 DESIGN OF A LINEAR ARRAY OF HALF WAVE PARALLEL DIPOLES USING PARTICLE SWARM OPTIMIZATION M. Rattan Department of Electronics and Communication
More informationHigh-Order FDTD with Exponential Time Differencing Algorithm for Modeling Wave Propagation in Debye Dispersive Materials
Progress In Electromagnetics Research Letters, Vol. 77, 103 107, 01 High-Order FDTD with Exponential Time Differencing Algorithm for Modeling Wave Propagation in Debye Dispersive Materials Wei-Jun Chen
More informationElectromagnetic Scattering from an Anisotropic Uniaxial-coated Conducting Sphere
Progress In Electromagnetics Research Symposium 25, Hangzhou, China, August 22-26 43 Electromagnetic Scattering from an Anisotropic Uniaxial-coated Conducting Sphere You-Lin Geng 1,2, Xin-Bao Wu 3, and
More informationElectromagnetic wave propagation through ultra-narrow channels filled
31st October, HKUST, Hong-Kong Electromagnetic wave propagation through ultra-narrow channels filled with an ENZ material Mário G. Silveirinha How to have ε-nearε zero (ENZ) Media? 2 ω p ε r ~1 ω ω ( +
More informationREALIZATION OF A MATCHING REGION BETWEEN A RADOME AND A GROUND PLANE
Progress In Electromagnetics Research Letters, Vol. 17, 1 1, 21 REALIZATION OF A MATCHING REGION BETWEEN A RADOME AND A GROUND PLANE D. Sjöberg and M. Gustafsson Department of Electrical and Information
More informationANALYSIS OF MICROWAVE CAVITY LOADED WITH LOSSY DIELECTRIC SLAB BY MEANS OF MODE MATCHING METHOD AND OPTIMIZATION OF LOAD LOCATION
Progress In Electromagnetics Research M, Vol. 4, 7 83, 200 ANALYSIS OF MICROWAVE CAVITY LOADED WITH LOSSY DIELECTRIC SLAB BY MEANS OF MODE MATCHING METHOD AND OPTIMIZATION OF LOAD LOCATION O. Süle Department
More informationElectromagnetic Waves
Electromagnetic Waves Maxwell s equations predict the propagation of electromagnetic energy away from time-varying sources (current and charge) in the form of waves. Consider a linear, homogeneous, isotropic
More informationChap. 1 Fundamental Concepts
NE 2 Chap. 1 Fundamental Concepts Important Laws in Electromagnetics Coulomb s Law (1785) Gauss s Law (1839) Ampere s Law (1827) Ohm s Law (1827) Kirchhoff s Law (1845) Biot-Savart Law (1820) Faradays
More information1 The formation and analysis of optical waveguides
1 The formation and analysis of optical waveguides 1.1 Introduction to optical waveguides Optical waveguides are made from material structures that have a core region which has a higher index of refraction
More informationNoise limitations on the recovery of average values of velocity profiles in pipelines by simple imaging systems
Noise limitations on the recovery of average values of velocity profiles in pipelines by simple imaging systems Massimo Brignone Gian Luigi Gragnani Matteo Pastorino Mirco Raffetto Andrea Randazzo April,
More informationUSING GENETIC ALGORITHM TO REDUCE THE RADAR CROSS SECTION OF THREE-DIMENSIONAL ANISOTROPIC IMPEDANCE OBJECT
Progress In Electromagnetics Research B, Vol. 9, 231 248, 2008 USING GENETIC ALGORITHM TO REDUCE THE RADAR CROSS SECTION OF THREE-DIMENSIONAL ANISOTROPIC IMPEDANCE OBJECT H.-T. Chen, G.-Q. Zhu, and S.-Y.
More informationIMPROVED ARTIFICIAL BEE COLONY FOR DESIGN OF A RECONFIGURABLE ANTENNA ARRAY WITH DISCRETE PHASE SHIFTERS
Progress In Electromagnetics Research C, Vol. 25, 193 208, 2012 IMPROVED ARTIFICIAL BEE COLONY FOR DESIGN OF A RECONFIGURABLE ANTENNA ARRAY WITH DISCRETE PHASE SHIFTERS X. T. Li, X. W. Zhao, J. N. Wang,
More informationDIRECTIVITY OPTIMIZATION IN PLANAR SUB-ARRAYED MONOPULSE ANTENNA
Progress In Electromagnetics Research Letters, Vol. 4, 1 7, 2008 DIRECTIVITY OPTIMIZATION IN PLANAR SUB-ARRAYED MONOPULSE ANTENNA P. Rocca, L. Manica, and A. Massa ELEDIA Department of Information Engineering
More informationOmar M. Ramahi University of Waterloo Waterloo, Ontario, Canada
Omar M. Ramahi University of Waterloo Waterloo, Ontario, Canada Traditional Material!! Electromagnetic Wave ε, μ r r The only properties an electromagnetic wave sees: 1. Electric permittivity, ε 2. Magnetic
More informationCHAPTER 9 ELECTROMAGNETIC WAVES
CHAPTER 9 ELECTROMAGNETIC WAVES Outlines 1. Waves in one dimension 2. Electromagnetic Waves in Vacuum 3. Electromagnetic waves in Matter 4. Absorption and Dispersion 5. Guided Waves 2 Skip 9.1.1 and 9.1.2
More informationINTERACTION OF ELECTROMAGNETIC WAVE AND PLASMA SLAB WITH PARTIALLY LINEAR AND SINU- SOIDAL ELECTRON DENSITY PROFILE
Progress In Electromagnetics Research Letters, Vol. 12, 171 181, 2009 INTERACTION OF ELECTROMAGNETIC WAVE AND PLASMA SLAB WITH PARTIALLY LINEAR AND SINU- SOIDAL ELECTRON DENSITY PROFILE Ç. S. Gürel Department
More informationTransmission-Reflection Method to Estimate Permittivity of Polymer
Transmission-Reflection Method to Estimate Permittivity of Polymer Chanchal Yadav Department of Physics & Electronics, Rajdhani College, University of Delhi, Delhi, India Abstract In transmission-reflection
More informationAN EXPRESSION FOR THE RADAR CROSS SECTION COMPUTATION OF AN ELECTRICALLY LARGE PERFECT CONDUCTING CYLINDER LOCATED OVER A DIELECTRIC HALF-SPACE
Progress In Electromagnetics Research, PIER 77, 267 272, 27 AN EXPRESSION FOR THE RADAR CROSS SECTION COMPUTATION OF AN ELECTRICALLY LARGE PERFECT CONDUCTING CYLINDER LOCATED OVER A DIELECTRIC HALF-SPACE
More informationANALYSIS OF DISPERSION RELATION OF PIECEWISE LINEAR RECURSIVE CONVOLUTION FDTD METHOD FOR SPACE-VARYING PLASMA
Progress In Electromagnetics Research Letters, Vol. 22, 83 93, 2011 ANALYSIS OF DISPERSION RELATION OF PIECEWISE LINEAR RECURSIVE CONVOLUTION FDTD METHOD FOR SPACE-VARYING PLASMA X. Ai Science and Technology
More informationTheoretical Investigation of Transmission and Dispersion Properties of One Dimensional Photonic Crystal
Journal of Electrical and Electronic Engineering 2015; 3(2): 12-18 Published online March 10, 2015 (http://www.sciencepublishinggroup.com/j/jeee) doi: 10.11648/j.jeee.20150302.11 ISSN: 2329-1613 (Print);
More informationEducation, Xidian University, Xi an, Shaanxi , China
Progress In Electromagnetics Research, Vol. 142, 423 435, 2013 VERTICAL CASCADED PLANAR EBG STRUCTURE FOR SSN SUPPRESSION Ling-Feng Shi 1, 2, * and Hong-Feng Jiang 1, 2 1 Key Lab of High-Speed Circuit
More informationAccurate Coupling Matrix Synthesis for Microwave Filters with Random Initial Value
Progress In Electromagnetics Research C, Vol. 55, 53 6, 4 Accurate Coupling Matrix Synthesis for Microwave Filters with Random Initial Value Guohui Li * Abstract A hybrid optimization method that synthesizes
More informationAPPLICATION OF CHIRAL LAYERS AND METAMATE- RIALS FOR THE REDUCTION OF RADAR CROSS SEC- TION
Progress In Electromagnetics Research, Vol. 37, 759 773, 23 APPLICATION OF CHIRAL LAYERS AND METAMATE- RIALS FOR THE REDUCTION OF RADAR CROSS SEC- TION Kimia Nikooei Tehrani *, Ali Abdolali, Davoud Zarifi,
More informationFinite Difference Solution of Maxwell s Equations
Chapter 1 Finite Difference Solution of Maxwell s Equations 1.1 Maxwell s Equations The principles of electromagnetism have been deduced from experimental observations. These principles are Faraday s law,
More informationCHARACTERIZATION OF MAGNETICALLY LOADED MICROWAVE ABSORBERS
Progress In Electromagnetics Research B, Vol. 33, 277 289, 2011 CHARACTERIZATION OF MAGNETICALLY LOADED MICROWAVE ABSORBERS I. Zivkovic * and A. Murk Institute of Applied Physics, University of Bern Siedlerstrasse
More informationProject: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Title: Design of Graphene-based Nano-antennas for Terahertz Band Communication Date Submitted: 12 November, 2012 Source:
More informationPower Absorption of Near Field of Elementary Radiators in Proximity of a Composite Layer
Power Absorption of Near Field of Elementary Radiators in Proximity of a Composite Layer M. Y. Koledintseva, P. C. Ravva, J. Y. Huang, and J. L. Drewniak University of Missouri-Rolla, USA M. Sabirov, V.
More informationA Wideband Wide-Angle Ultra-Thin Metamaterial Microwave Absorber
Progress In Electromagnetics Research M, Vol. 44, 39 46, 2015 A Wideband Wide-Angle Ultra-Thin Metamaterial Microwave Absorber Deepak Sood * and Chandra Charu Tripathi Abstract A novel design of wideband,
More informationAN EXACT FORMULATION FOR THE REFLECTION COEFFICIENT FROM ANISOTROPIC MULTILAYER STRUCTURES WITH ARBITRARY BACKING
Progress In Electromagnetics Research M, Vol. 30, 79 93, 2013 AN EXACT FORMULATION FOR THE REFLECTION COEFFICIENT FROM ANISOTROPIC MULTILAYER STRUCTURES WITH ARBITRARY BACKING Ali Abdolali *, Maryam Heidary,
More informationA UNEQUAL COUPLED-LINE WILKINSON POWER DI- VIDER FOR ARBITRARY TERMINATED IMPEDANCES
Progress In Electromagnetics Research, Vol. 117, 181 194, 211 A UNEQUAL COUPLED-LINE WILKINSON POWER DI- VIDER FOR ARBITRARY TERMINATED IMPEDANCES Y. Wu * and Y. Liu School of Electronic Engineering, Beijing
More information5 RCS Management of Edge Diffracted Waves
5 RCS Management of Edge Diffracted Waves 5.1 Introduction Radar absorbing materials (RAM s) applied as a coating on the surface of an object, partially transform the energy of an incident radar beam into
More informationThrough-wall Imaging of Conductors by Transverse Electric Wave Illumination
Journal of Applied Science and Engineering, Vol. 20, No. 4, pp. 477 482 (2017) DOI: 10.6180/jase.2017.20.4.09 Through-wall Imaging of Conductors by Transverse Electric Wave Illumination Wei Chien 1, Chien-Ching
More informationCONTROL OF MICROWAVE HEATING IN RECTANGULAR WAVEGUIDE
ISTP-16, 2005, PRAGUE 16 TH INTERNATIONAL SYMPOSIUM ON TRANSPORT PHENOMENA CONTROL OF MICROWAVE HEATING IN RECTANGULAR WAVEGUIDE Kazuo AOKI*, Masatoshi AKAHORI*, Kenji OSHIMA** and Masato MORITA* *Nagaoka
More informationAlternative approaches to electromagnetic cloaking and invisibility
Helsinki University of Technology SMARAD Centre of Excellence Radio Laboratory Alternative approaches to electromagnetic cloaking and invisibility Sergei Tretyakov and colleagues December 2007 What is
More information86 Edgar García, Iván Amaya, Rodrigo Correa
86 Edgar García, Iván Amaya, Rodrigo Correa Abstract This article presents a strategy for designing optimal planar electromagnetic absorbers of several layers. The electromagnetic absorbers designed can
More informationELECTROMAGNETIC FIELD OF A HORIZONTAL IN- FINITELY LONG MAGNETIC LINE SOURCE OVER THE EARTH COATED WITH A DIELECTRIC LAYER
Progress In Electromagnetics Research Letters, Vol. 31, 55 64, 2012 ELECTROMAGNETIC FIELD OF A HORIZONTAL IN- FINITELY LONG MAGNETIC LINE SOURCE OVER THE EARTH COATED WITH A DIELECTRIC LAYER Y.-J. Zhi
More informationA Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations
Syracuse University SURFACE Electrical Engineering and Computer Science - Dissertations College of Engineering and Computer Science 2011 A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic
More informationECE Spring Prof. David R. Jackson ECE Dept. Notes 6
ECE 6341 Spring 2016 Prof. David R. Jackson ECE Dept. Notes 6 1 Leaky Modes v TM 1 Mode SW 1 v= utan u ε R 2 R kh 0 n1 r = ( ) 1 u Splitting point ISW f = f s f > f s We will examine the solutions as the
More information