Pub Date : 2018-03-01DOI: 10.1109/COMPEM.2018.8496597
Jixuan Liu, X. Kong, Shaobin Liu
A single layer multi-polarization transmitarray is presented in this paper, whose structure can be much simpler than the traditional multi-layer frequency selective surface transmitarray. The proposed transmitarray consists of numerous split ring elements and has three working conditions. It is designed, simulated and measured in C-band. The measurement result shows that the transmitarray can switch polarization of the incident wave and set separation beam direction at the same time
{"title":"Single Layer Multi-Polarization Transmitarray in C-Band with Beam-Steering Capability","authors":"Jixuan Liu, X. Kong, Shaobin Liu","doi":"10.1109/COMPEM.2018.8496597","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496597","url":null,"abstract":"A single layer multi-polarization transmitarray is presented in this paper, whose structure can be much simpler than the traditional multi-layer frequency selective surface transmitarray. The proposed transmitarray consists of numerous split ring elements and has three working conditions. It is designed, simulated and measured in C-band. The measurement result shows that the transmitarray can switch polarization of the incident wave and set separation beam direction at the same time","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121037732","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496633
Chunbei Luo, Xiaowei Mei, Hai Lin
A 3D beam tracing method for modelling complex urban environment radio propagation is presented. A partial scenario centering on the transmitting antenna is extracted and the corresponding localized KD-tree is constructed for accelerating intersection tests between beams and triangular facets. For validation of the proposed method, simulation results of realistic urban environment are compared with measurements.
{"title":"Localized KD-Tree Accelerated Beam Tracing Method for Modelling Complex Urban Environment Propagation","authors":"Chunbei Luo, Xiaowei Mei, Hai Lin","doi":"10.1109/COMPEM.2018.8496633","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496633","url":null,"abstract":"A 3D beam tracing method for modelling complex urban environment radio propagation is presented. A partial scenario centering on the transmitting antenna is extracted and the corresponding localized KD-tree is constructed for accelerating intersection tests between beams and triangular facets. For validation of the proposed method, simulation results of realistic urban environment are compared with measurements.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"128 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114014560","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496569
Z. Huang, Y. Cheng
A mathematical model for near-field sparse array antennas synthesis is established in this work for the first time. An algorithm based on the multi-task compressive sensing method is employed to obtain the element position and excitation coefficient fitting a desired near-field radiation pattern. Numerical results validate the effectiveness of the proposed method to synthesize different types of desired patterns with more than 30% of elements saved compared with uniformly spaced array.
{"title":"Synthesis of Sparse Near-Field Focusing Antenna Arrays Based on Bayesian Compressive Sensing","authors":"Z. Huang, Y. Cheng","doi":"10.1109/COMPEM.2018.8496569","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496569","url":null,"abstract":"A mathematical model for near-field sparse array antennas synthesis is established in this work for the first time. An algorithm based on the multi-task compressive sensing method is employed to obtain the element position and excitation coefficient fitting a desired near-field radiation pattern. Numerical results validate the effectiveness of the proposed method to synthesize different types of desired patterns with more than 30% of elements saved compared with uniformly spaced array.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132942352","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496497
Junbo Liu, Jun Hu, Yongpin P. Chen
In lasing without inversion, the essential idea is the absorption in cancellation by atomic coherence and interference. Usually this is accomplished in three-level atomic systems. In this work, the interaction of a three-level atom and the external electromagnetic field is discussed by the Maxwell-Schrddinger model. The atom is treated quantum mechanically by the Schrddinger equation, whereas the field is treated classically by the Maxwell's equations. An example is presented to demonstrate the effect of coherent trapping.
{"title":"The Maxwell-Schrödinger Model for Three-Level Atomic System with Electromagnetic Field","authors":"Junbo Liu, Jun Hu, Yongpin P. Chen","doi":"10.1109/COMPEM.2018.8496497","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496497","url":null,"abstract":"In lasing without inversion, the essential idea is the absorption in cancellation by atomic coherence and interference. Usually this is accomplished in three-level atomic systems. In this work, the interaction of a three-level atom and the external electromagnetic field is discussed by the Maxwell-Schrddinger model. The atom is treated quantum mechanically by the Schrddinger equation, whereas the field is treated classically by the Maxwell's equations. An example is presented to demonstrate the effect of coherent trapping.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"47 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132289437","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496733
Xing-Yu Dong, Wenwen Yang, Jian‐Xin Chen
In this paper, a novel wideband polarization reconfigurable dielectric resonator antenna (DRA) is proposed. Since only five p-i-n diodes are needed to implement the reconfigurablility and the reconfigurable circuit is isolated from the DRA by the ground plane, the antenna shows a simple structure. By combing the two resonant frequencies of DR mode and DR-loaded cross-slot mode, the antenna can achieve a wide operating bandwidth. Simulated results show that the antenna can achieve a 3-dB axial ratio (AR) bandwidth of 16% for circular polarization (CP) states, an impedance bandwidth of 19% for linear polarization (LP) state with a cross-polarization level of better than 25 dB, and a peak gain of 7 dBi for all states.
{"title":"Wideband Dielectric Resonator Antenna with Polarization Reconfigurability","authors":"Xing-Yu Dong, Wenwen Yang, Jian‐Xin Chen","doi":"10.1109/COMPEM.2018.8496733","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496733","url":null,"abstract":"In this paper, a novel wideband polarization reconfigurable dielectric resonator antenna (DRA) is proposed. Since only five p-i-n diodes are needed to implement the reconfigurablility and the reconfigurable circuit is isolated from the DRA by the ground plane, the antenna shows a simple structure. By combing the two resonant frequencies of DR mode and DR-loaded cross-slot mode, the antenna can achieve a wide operating bandwidth. Simulated results show that the antenna can achieve a 3-dB axial ratio (AR) bandwidth of 16% for circular polarization (CP) states, an impedance bandwidth of 19% for linear polarization (LP) state with a cross-polarization level of better than 25 dB, and a peak gain of 7 dBi for all states.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134520974","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496616
Z. Wu, Zhou Cong, Zi He, D. Ding, Rushan Chen
In this paper, a new method based on SBR method is proposed to calculate the electromagnetic scattering problem of electrically large target. In traditional SBR method, the split size is usually less than 0.4 wavelength to ensure the accuracy. In this paper, the split size which could describe the shape of the target is enough. So the calculating memory and time can be reduced greatly. And the parallel technology is utilized to further accelerate the speed of the program.
{"title":"Study on Efficient High Frequency Method of Electromagnetic Scattering of Electrically Large Target","authors":"Z. Wu, Zhou Cong, Zi He, D. Ding, Rushan Chen","doi":"10.1109/COMPEM.2018.8496616","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496616","url":null,"abstract":"In this paper, a new method based on SBR method is proposed to calculate the electromagnetic scattering problem of electrically large target. In traditional SBR method, the split size is usually less than 0.4 wavelength to ensure the accuracy. In this paper, the split size which could describe the shape of the target is enough. So the calculating memory and time can be reduced greatly. And the parallel technology is utilized to further accelerate the speed of the program.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124280135","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496680
Juan Chen, Ning Xu
The hybrid implicit-explicit finite-difference time domain (HIE-FDTD) method is presented to simulate the graphene layer. By using the auxiliary differential equation (ADE) and Pade fitting method, both the interband and intraband conductivity of the graphene are incorporated into the HIE-FDTD method. The time step increment in the proposed method is not determined by the fine meshes in the graphene layer, so the computational efficiency of this method is greatly improved from that of the conventional finite-difference time domain (FDTD) method, which is well validated by numerical examples. Besides, the numerical simulation also shows that the interband conductivity of the graphene has important effects on the performance of the graphene, especially at higher Terahertz (THz) spectra.
{"title":"The HIE-FDTD Method for Simulating Graphene","authors":"Juan Chen, Ning Xu","doi":"10.1109/COMPEM.2018.8496680","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496680","url":null,"abstract":"The hybrid implicit-explicit finite-difference time domain (HIE-FDTD) method is presented to simulate the graphene layer. By using the auxiliary differential equation (ADE) and Pade fitting method, both the interband and intraband conductivity of the graphene are incorporated into the HIE-FDTD method. The time step increment in the proposed method is not determined by the fine meshes in the graphene layer, so the computational efficiency of this method is greatly improved from that of the conventional finite-difference time domain (FDTD) method, which is well validated by numerical examples. Besides, the numerical simulation also shows that the interband conductivity of the graphene has important effects on the performance of the graphene, especially at higher Terahertz (THz) spectra.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131670991","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496692
Lei Ge, Xujun Yang
A differentially-driven dual-polarized high-gain stacked patch antenna is presented in this paper. Three-layer stacked patches are adopted to increase the impedance bandwidth of the antenna. Each of the three stacked patches are inserted with four shorting posts for enhancing the antenna gain. A wide band and a high isolation can be realized. Moreover, the antenna possesses the gain of as high as 11 dBi by the proposed design mechanism.
{"title":"A High-Gain Dual-Polarized Antenna","authors":"Lei Ge, Xujun Yang","doi":"10.1109/COMPEM.2018.8496692","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496692","url":null,"abstract":"A differentially-driven dual-polarized high-gain stacked patch antenna is presented in this paper. Three-layer stacked patches are adopted to increase the impedance bandwidth of the antenna. Each of the three stacked patches are inserted with four shorting posts for enhancing the antenna gain. A wide band and a high isolation can be realized. Moreover, the antenna possesses the gain of as high as 11 dBi by the proposed design mechanism.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117151391","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496601
Meijun Qu, L. Deng, Shuxiang Liu, Shufang Li
In this letter, a novel frequency-independent circular polarized antenna is proposed for satellite communication application. It consists of a slot coupled antenna and a planar metasurface. Four compact sequential L-shaped feeding lines could generate energy to the metasurface through the metallic ground embedded cross slot. Therefore, surface waves could propagate on the metasurface, making the antenna generate additional resonances. Then, wide impedance bandwidth and axial ratio bandwidth of the proposed antenna can be achieved. Besides, the proposed antenna has low profile (0.05 λ0at 3.5 GHz), frequency independent, large front-to-back ratio, high gain, and wide half-power beamwidth property. It has great potential in global satellite communication systems and satellite navigation systems (S band and C band).
{"title":"A Metasurface-Based Slot Coupled Circularly Polarized Antenna for Satellite Communication Application","authors":"Meijun Qu, L. Deng, Shuxiang Liu, Shufang Li","doi":"10.1109/COMPEM.2018.8496601","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496601","url":null,"abstract":"In this letter, a novel frequency-independent circular polarized antenna is proposed for satellite communication application. It consists of a slot coupled antenna and a planar metasurface. Four compact sequential L-shaped feeding lines could generate energy to the metasurface through the metallic ground embedded cross slot. Therefore, surface waves could propagate on the metasurface, making the antenna generate additional resonances. Then, wide impedance bandwidth and axial ratio bandwidth of the proposed antenna can be achieved. Besides, the proposed antenna has low profile (0.05 λ0at 3.5 GHz), frequency independent, large front-to-back ratio, high gain, and wide half-power beamwidth property. It has great potential in global satellite communication systems and satellite navigation systems (S band and C band).","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116444798","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496545
Qun Li, Yonghong Zhang, Lili Qu, Yong Fan
Analytical solutions for characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics are presented. Using the conformal mapping approach, the cross section of coaxial line filled with multilayer dielectrics in z-plane is mapped into cross section of parallel-plate filled with multilayer dielectrics in the t-plane. The capacitance per unit length keeps the same after conformal mapping. The capacitance per unit length is calculated in the t-plane using the classic parallel-plate capacitance calculation equation. Based on the capacitance per unit length, characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics can be derived using transmission line theory. Finally, two examples are given to verify the results. The presented analytical solutions are accurate as well as efficient and are useful for transmission line theory and computer-aided design in microwave engineering.
{"title":"Quasi-Static Analysis of Multilayer Dielectrics Filled Coaxial Line Using Conformal Mapping Method","authors":"Qun Li, Yonghong Zhang, Lili Qu, Yong Fan","doi":"10.1109/COMPEM.2018.8496545","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496545","url":null,"abstract":"Analytical solutions for characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics are presented. Using the conformal mapping approach, the cross section of coaxial line filled with multilayer dielectrics in z-plane is mapped into cross section of parallel-plate filled with multilayer dielectrics in the t-plane. The capacitance per unit length keeps the same after conformal mapping. The capacitance per unit length is calculated in the t-plane using the classic parallel-plate capacitance calculation equation. Based on the capacitance per unit length, characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics can be derived using transmission line theory. Finally, two examples are given to verify the results. The presented analytical solutions are accurate as well as efficient and are useful for transmission line theory and computer-aided design in microwave engineering.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116489724","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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