Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052647
Ye Zhou, Yi Wang, Q. Cao
An auxiliary differential equation (ADE) finite-difference time-domain (FDTD) method is applied to analyze the effect of ionospheric high frequency (HF) heating on electromagnetic (EM) wave propagation. First ionosphere background parameters in East China generated from IRI are introduced in the study model and nonlinear phenomenon during ionospheric heating process at low altitude between 60 and 120km is simulated. Then vertical distribution of electron temperature in initial and saturation condition is used to simulate the EM wave propagation in the ionosphere. During the simulation, an ADE plasma model is employed to simulate the dispersive characteristics of the ionosphere. The simulation result shows that the ionospheric heating has a direct influence on the echo wave.
{"title":"FDTD analysis of HF heating effect on local ionosphere","authors":"Ye Zhou, Yi Wang, Q. Cao","doi":"10.1109/COMPEM.2015.7052647","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052647","url":null,"abstract":"An auxiliary differential equation (ADE) finite-difference time-domain (FDTD) method is applied to analyze the effect of ionospheric high frequency (HF) heating on electromagnetic (EM) wave propagation. First ionosphere background parameters in East China generated from IRI are introduced in the study model and nonlinear phenomenon during ionospheric heating process at low altitude between 60 and 120km is simulated. Then vertical distribution of electron temperature in initial and saturation condition is used to simulate the EM wave propagation in the ionosphere. During the simulation, an ADE plasma model is employed to simulate the dispersive characteristics of the ionosphere. The simulation result shows that the ionospheric heating has a direct influence on the echo wave.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"37 1","pages":"318-320"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87705644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052553
M. Zubair, M. Francavilla, M. Righero, G. Vecchi, L. Dal Negro
This work presents a fast analysis of electromagnetic scattering from arrays of metallic nano-particles with aperiodic spiral order. The reported method extends the integral equation fast Fourier transform (IE-FFT) algorithm to the method of moments solution of PMCHWT integral equation for aperiodic homogenous dielectric arrays. The algorithm relies on the interpolation of Greens function by Lagrangian polynomials on a uniform Cartesian grid. Hence, the matrix-vector product in the iterative solver can be computed via the fast Fourier transform. The memory requirement and the computational complexity of the algorithm tend to stay close to O(N) and O(NlogN), respectively, where N is the number of unknowns. Some numerical examples are included, which illustrate the accuracy and capability of the present method.
{"title":"Fast analysis of electrically large plasmonic arrays with aperiodic spiral order","authors":"M. Zubair, M. Francavilla, M. Righero, G. Vecchi, L. Dal Negro","doi":"10.1109/COMPEM.2015.7052553","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052553","url":null,"abstract":"This work presents a fast analysis of electromagnetic scattering from arrays of metallic nano-particles with aperiodic spiral order. The reported method extends the integral equation fast Fourier transform (IE-FFT) algorithm to the method of moments solution of PMCHWT integral equation for aperiodic homogenous dielectric arrays. The algorithm relies on the interpolation of Greens function by Lagrangian polynomials on a uniform Cartesian grid. Hence, the matrix-vector product in the iterative solver can be computed via the fast Fourier transform. The memory requirement and the computational complexity of the algorithm tend to stay close to O(N) and O(NlogN), respectively, where N is the number of unknowns. Some numerical examples are included, which illustrate the accuracy and capability of the present method.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"1 1","pages":"53-55"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89478225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052654
H. Nasser, S. Greedy, T. Benson, A. Vukovic, P. Sewell
Advances in small scale fabrication processes have led to the advent of very thin flexible devices such as flexible RFID tags and smart clothing. In a geometrical sense, these present themselves as curved 2D open surfaces embedded in a 3D domain. When simulating EM behavior on these surfaces at low frequencies, a full 3D field model can become computationally expensive in terms of memory and run times. The objective of this paper is to present a method for applying a 2D unstructured Transmission Line Method (TLM) simulation to open, curved surfaces embedded in a 3D domain, by providing a one-to-one mapping of the geometry to a 2D flat plane The simulation results are then mapped back to the original 3D geometry, negating the need for a full 3D simulation. Further, we demonstrate that if the surface material parameters are altered in the vicinity of high curvature, the proposed method is still effective.
{"title":"3D to 2D surface mesh parameterization for unstructured transmission line method simulations","authors":"H. Nasser, S. Greedy, T. Benson, A. Vukovic, P. Sewell","doi":"10.1109/COMPEM.2015.7052654","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052654","url":null,"abstract":"Advances in small scale fabrication processes have led to the advent of very thin flexible devices such as flexible RFID tags and smart clothing. In a geometrical sense, these present themselves as curved 2D open surfaces embedded in a 3D domain. When simulating EM behavior on these surfaces at low frequencies, a full 3D field model can become computationally expensive in terms of memory and run times. The objective of this paper is to present a method for applying a 2D unstructured Transmission Line Method (TLM) simulation to open, curved surfaces embedded in a 3D domain, by providing a one-to-one mapping of the geometry to a 2D flat plane The simulation results are then mapped back to the original 3D geometry, negating the need for a full 3D simulation. Further, we demonstrate that if the surface material parameters are altered in the vicinity of high curvature, the proposed method is still effective.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"45 1","pages":"338-340"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84814683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052548
Zhe Song, Yan Zhang, Xing Mu, Houxing Zhou, W. Hong
In this paper, an accurate and efficient full wave analysis for millimeter wave quasi-periodical structure for antenna applications is realized. By extracting all the surface wave poles of the spectral domain multilayered Green's functions, the discrete complex image method (DCIM) can be adopted to fast evaluate their counter parts in spatial domain, and the mixed potential integral equation (MPIE) for method of moments (MoM) can be constructed. With the Jerusalem cross as a patch element on a dielectric layer, a quasi-periodical structure can be organized as the geometries gradually varied. By illuminate this kind of structure with an incident plane wave, the distribution of electric current on the metal surface can be obtained by solving the MoM equation and the forward scattering cross section can be fast calculated by the conjugate gradient (CG) algorithm written in CUDA and realized in NVIDIA graphic process unit (GPU). A layered structure with a 17×17 Jerusalem crosses at 30GHz was calculated and very good agreements have been found between the proposed method and commercial EM simulator (CST), while an improvement on efficiency is realized.
{"title":"Full wave analysis of millimeter wave quasi-periodical structure for antenna applications by method of moments and its conjugate gradient solution on GPU/CPU platform","authors":"Zhe Song, Yan Zhang, Xing Mu, Houxing Zhou, W. Hong","doi":"10.1109/COMPEM.2015.7052548","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052548","url":null,"abstract":"In this paper, an accurate and efficient full wave analysis for millimeter wave quasi-periodical structure for antenna applications is realized. By extracting all the surface wave poles of the spectral domain multilayered Green's functions, the discrete complex image method (DCIM) can be adopted to fast evaluate their counter parts in spatial domain, and the mixed potential integral equation (MPIE) for method of moments (MoM) can be constructed. With the Jerusalem cross as a patch element on a dielectric layer, a quasi-periodical structure can be organized as the geometries gradually varied. By illuminate this kind of structure with an incident plane wave, the distribution of electric current on the metal surface can be obtained by solving the MoM equation and the forward scattering cross section can be fast calculated by the conjugate gradient (CG) algorithm written in CUDA and realized in NVIDIA graphic process unit (GPU). A layered structure with a 17×17 Jerusalem crosses at 30GHz was calculated and very good agreements have been found between the proposed method and commercial EM simulator (CST), while an improvement on efficiency is realized.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"24 1","pages":"41-42"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91088287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052657
L. Khashan, A. Vukovic, P. Sewell, T. Benson
In this paper the dispersion characteristics of the two-dimensional TLM method, based upon an unstructured triangular mesh, are investigated and compared against those of the TLM method based on structured rectangular mesh. This is done numerically on an example of plane wave propagation in an homogeneous free space. Phase errors of plane wave propagation are extracted for a variety of triangular meshes and compared to an equivalent conventional TLM mesh. The computational resources needed for TLM method based on triangular and rectangular grid to obtain the same numerical dispersion are also compared.
{"title":"Dispersion in the 2D unstructured transmission line modelling (UTLM) method","authors":"L. Khashan, A. Vukovic, P. Sewell, T. Benson","doi":"10.1109/COMPEM.2015.7052657","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052657","url":null,"abstract":"In this paper the dispersion characteristics of the two-dimensional TLM method, based upon an unstructured triangular mesh, are investigated and compared against those of the TLM method based on structured rectangular mesh. This is done numerically on an example of plane wave propagation in an homogeneous free space. Phase errors of plane wave propagation are extracted for a variety of triangular meshes and compared to an equivalent conventional TLM mesh. The computational resources needed for TLM method based on triangular and rectangular grid to obtain the same numerical dispersion are also compared.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"17 1","pages":"347-349"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75694609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052574
Y. Juan, W. Che, Wanchen Yang, Zhining Chen
An antenna with four sets of PIN diodes-loaded parasitic strips and reflectors is designed to realize multiple reconfigurable radiation pattern. Parasitic strips are placed between the dipole and reflectors to change impedance of the dipole, thus reducing the distance between the dipole and the reflector. The size of the whole antenna is only 0.1λ0×0.1λ0. Moreover, by switching and controlling the PIN diode, the parasitic strip and reflector can perform as a director or a reflector, a Yagi-Uda antenna. As a result, the antenna can provide three modes with nine fundamental radiation patterns. Two modes can realize an eight-beam scanning in the azimuth plane with a 45°-angle-interval at the frequency of 1.575GHz. The peak gain more than 7dBi of all the beams are achieved at the elevation angle of 60°. Another mode can generate an approximate conical radiation pattern. The maximum gain is 5.1 dBi, achieved at the elevation angle of 50°.
{"title":"Compact dipole antenna with multiple radiation pattern reconfigurations","authors":"Y. Juan, W. Che, Wanchen Yang, Zhining Chen","doi":"10.1109/COMPEM.2015.7052574","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052574","url":null,"abstract":"An antenna with four sets of PIN diodes-loaded parasitic strips and reflectors is designed to realize multiple reconfigurable radiation pattern. Parasitic strips are placed between the dipole and reflectors to change impedance of the dipole, thus reducing the distance between the dipole and the reflector. The size of the whole antenna is only 0.1λ0×0.1λ0. Moreover, by switching and controlling the PIN diode, the parasitic strip and reflector can perform as a director or a reflector, a Yagi-Uda antenna. As a result, the antenna can provide three modes with nine fundamental radiation patterns. Two modes can realize an eight-beam scanning in the azimuth plane with a 45°-angle-interval at the frequency of 1.575GHz. The peak gain more than 7dBi of all the beams are achieved at the elevation angle of 60°. Another mode can generate an approximate conical radiation pattern. The maximum gain is 5.1 dBi, achieved at the elevation angle of 50°.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"10 1","pages":"112-114"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86850990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052638
R. Zhao, Jun Hu, M. Jiang, Z. Nie
In this paper, a novel non-conformal non-overlapping integral equation domain decomposition method with impedance boundary condition (IE-DDM-IBC) is presented to simulate the EM scattering from thin coating objects. By using the Robin transmission condition, the original object can be decomposed into several non-overlapping closed sub-domains, and each sub-domain can be meshed independently. It also provides an effective preconditioner to realize fast convergence for thin coating objects with multi-scale property.
{"title":"Integral equation domain decomposition method for scattering from thin coating objects","authors":"R. Zhao, Jun Hu, M. Jiang, Z. Nie","doi":"10.1109/COMPEM.2015.7052638","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052638","url":null,"abstract":"In this paper, a novel non-conformal non-overlapping integral equation domain decomposition method with impedance boundary condition (IE-DDM-IBC) is presented to simulate the EM scattering from thin coating objects. By using the Robin transmission condition, the original object can be decomposed into several non-overlapping closed sub-domains, and each sub-domain can be meshed independently. It also provides an effective preconditioner to realize fast convergence for thin coating objects with multi-scale property.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"70 1","pages":"291-293"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86285156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A THz antipodal hyperbolic-sine tapered slot antenna (AHSTSA) designed on silicon is proposed in this paper. The antenna is feed by WR2.2 waveguide and work at 480GHz to 500GHz. The antipodal curved slots and feeding waveguide are designed to be monolithically fabricated by deep reactive-ion etching (DRIE), then sputtering gold, with gold-gold thermo-compression bonding at last. The simulation result of VSWR is below 1.25 within 480GHz to 520GHz. The AHSTSA shows asymmetric beamwidths of ~20° in both E- and H-plane, with a maximum gain of 17.7dBi. The cross polarization and sidelobe levels are less than -20.7dBi and -10.6dBi, respectively. The proposed AHSTSA can be used in THz imaging and detection systems.
{"title":"Design of terahertz waveguide-fed antipodal hyperbolic-sine tapered slot antenna based on silicon micromachine","authors":"Peng-fei Zhao, Qing Li, Hongda Lu, Bin Li, Yong Liu, X. Lv","doi":"10.1109/COMPEM.2015.7052661","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052661","url":null,"abstract":"A THz antipodal hyperbolic-sine tapered slot antenna (AHSTSA) designed on silicon is proposed in this paper. The antenna is feed by WR2.2 waveguide and work at 480GHz to 500GHz. The antipodal curved slots and feeding waveguide are designed to be monolithically fabricated by deep reactive-ion etching (DRIE), then sputtering gold, with gold-gold thermo-compression bonding at last. The simulation result of VSWR is below 1.25 within 480GHz to 520GHz. The AHSTSA shows asymmetric beamwidths of ~20° in both E- and H-plane, with a maximum gain of 17.7dBi. The cross polarization and sidelobe levels are less than -20.7dBi and -10.6dBi, respectively. The proposed AHSTSA can be used in THz imaging and detection systems.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"63 1","pages":"358-360"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84070005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052634
Y. Pan
An omnidirectional circularly polarized (CP) dielectric resonator antenna (DRA) with a parasitic patch loading on its top is investigated in this paper. It is found that the operating frequency of the antenna can be tuned by changing both the sizes of the patch and ground plane. The reflection coefficient, axial ratio (AR), radiation pattern and antenna gain of the proposed CP DRA are studied, and reasonable agreement between the measured and simulated results is observed.
{"title":"Frequency tuning of the omnidirectional circularly polarized dielectric resonator antenna using parasitic patch","authors":"Y. Pan","doi":"10.1109/COMPEM.2015.7052634","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052634","url":null,"abstract":"An omnidirectional circularly polarized (CP) dielectric resonator antenna (DRA) with a parasitic patch loading on its top is investigated in this paper. It is found that the operating frequency of the antenna can be tuned by changing both the sizes of the patch and ground plane. The reflection coefficient, axial ratio (AR), radiation pattern and antenna gain of the proposed CP DRA are studied, and reasonable agreement between the measured and simulated results is observed.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"19 1","pages":"281-283"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72772980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052590
J. Schorer, J. Bornemann
The adaption of Mode Matching Techniques (MMTs) for an E-plane double-layer discontinuity is presented. The bottom layer is realized in substrate integrated waveguide (SIW) and the top layer in conventional waveguide technology. The calculations are validated by comparison with data from commercial field solvers. The verification shows a good match and qualifies the MMT routine as a suitable method to prototype magnetically coupled, double layer, mixed technology filters.
{"title":"Mode-matching analysis for double-layered substrate integrated and rectangular waveguide filter technology","authors":"J. Schorer, J. Bornemann","doi":"10.1109/COMPEM.2015.7052590","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052590","url":null,"abstract":"The adaption of Mode Matching Techniques (MMTs) for an E-plane double-layer discontinuity is presented. The bottom layer is realized in substrate integrated waveguide (SIW) and the top layer in conventional waveguide technology. The calculations are validated by comparison with data from commercial field solvers. The verification shows a good match and qualifies the MMT routine as a suitable method to prototype magnetically coupled, double layer, mixed technology filters.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"12 1","pages":"158-160"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74580861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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