Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052575
Sung-min Kim, K. Min, Seong-yong Gang
This paper presents a multiband antenna composed of one main monopole and four parasitic poles for the in-building mobile relay system including a firefighting radio band. A main center pole is resonated at 450 MHz of the firefighting band, parasitic poles are considered for the multi-resonance and the beam direction control. The measured results such as the reflection coefficients and the radiation patterns of a fabricated antenna are shown reasonable agreement with the prediction.
{"title":"Design for multiband relay antenna with parasitic monopoles","authors":"Sung-min Kim, K. Min, Seong-yong Gang","doi":"10.1109/COMPEM.2015.7052575","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052575","url":null,"abstract":"This paper presents a multiband antenna composed of one main monopole and four parasitic poles for the in-building mobile relay system including a firefighting radio band. A main center pole is resonated at 450 MHz of the firefighting band, parasitic poles are considered for the multi-resonance and the beam direction control. The measured results such as the reflection coefficients and the radiation patterns of a fabricated antenna are shown reasonable agreement with the prediction.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"23 1","pages":"115-117"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81678752","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.2015.7052550
Zhao Wu, Haixia Liu, Yan Shi, Long Li
A wideband and low-profile circularly polarized antenna using metasurface for WLAN or satellite communication applications is proposed. The proposed antenna consists of a planar slot coupling antenna with an array of metallic rectangular patches which can be viewed as a metasurface. The metasurface is utilized to adjust axial ratio (AR) for circularly polarized radiation and the slot is angled at 42° with respect to the feed-line. Furthermore, the proposed metamaterial-inspired antenna has a compact structure with a low-profile of 0.07λ0 (λ0 stands for the free space wavelength at 5.25 GHz). Simulated results show that the -10 dB impedance bandwidth for the proposed antenna is 32.5% from 4.25 to 5.9 GHz, and 3-dB AR bandwidth is 18.5% from 4.9 to 5.9 GHz.
{"title":"Metamaterial-inspired wideband low-profile circularly polarized antenna","authors":"Zhao Wu, Haixia Liu, Yan Shi, Long Li","doi":"10.1109/COMPEM.2015.7052550","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052550","url":null,"abstract":"A wideband and low-profile circularly polarized antenna using metasurface for WLAN or satellite communication applications is proposed. The proposed antenna consists of a planar slot coupling antenna with an array of metallic rectangular patches which can be viewed as a metasurface. The metasurface is utilized to adjust axial ratio (AR) for circularly polarized radiation and the slot is angled at 42° with respect to the feed-line. Furthermore, the proposed metamaterial-inspired antenna has a compact structure with a low-profile of 0.07λ0 (λ0 stands for the free space wavelength at 5.25 GHz). Simulated results show that the -10 dB impedance bandwidth for the proposed antenna is 32.5% from 4.25 to 5.9 GHz, and 3-dB AR bandwidth is 18.5% from 4.9 to 5.9 GHz.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"3 1","pages":"45-46"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81800094","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.2015.7052569
G. Z. Yin, J. Zhang, W. J. Chen, M. Tong
The interaction of transient electromagnetic (EM) wave with objects can be formulated by the integral equation approach in time domain. For conducting objects or homogeneous penetrable objects, the time-domain surface integral equations (TDSIEs) can be applied. Traditionally, the TDSIEs are solved by the method of moments (MoM) in spatial domain and a march-on in time (MOT) scheme in temporal domain. In this work, we propose a hybrid scheme in which the Nyström method is used in spatial domain while the MoM with Laguerre function as a basis function in the time domain is employed. The numerical example for EM scattering by a conducting sphere is presented to demonstrate the scheme and its merits can be observed.
{"title":"Nyström method solution for time-domain electric field integral equations","authors":"G. Z. Yin, J. Zhang, W. J. Chen, M. Tong","doi":"10.1109/COMPEM.2015.7052569","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052569","url":null,"abstract":"The interaction of transient electromagnetic (EM) wave with objects can be formulated by the integral equation approach in time domain. For conducting objects or homogeneous penetrable objects, the time-domain surface integral equations (TDSIEs) can be applied. Traditionally, the TDSIEs are solved by the method of moments (MoM) in spatial domain and a march-on in time (MOT) scheme in temporal domain. In this work, we propose a hybrid scheme in which the Nyström method is used in spatial domain while the MoM with Laguerre function as a basis function in the time domain is employed. The numerical example for EM scattering by a conducting sphere is presented to demonstrate the scheme and its merits can be observed.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"8 1","pages":"98-100"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81571073","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.2015.7052643
Xiaowei Mei, Yong Zhang, Hai Lin
A new efficient hybrid technique is presented, which combines the method of moments (MoM) and the shooting and bouncing ray (SBR) for analyzing scattering of complex large structures. By applying the SBR method for the whole structures, a corrected incident field including not only the direct incident field but also the multi-bounce field from the SBR region contributes to the integral equation in the MoM region. For the SBR region, it also considers the interaction from MoM region and then a physical optics (PO) type integration is performed to calculate the scattered field. For complex electrically large electromagnetic problems, the proposed technique is more efficient and simpler to implement in a general-purpose computer code. Numerical results are presented to show the efficiency and accuracy of the method.
{"title":"A new efficient hybrid SBR/MoM technique for scattering analysis of complex large structures","authors":"Xiaowei Mei, Yong Zhang, Hai Lin","doi":"10.1109/COMPEM.2015.7052643","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052643","url":null,"abstract":"A new efficient hybrid technique is presented, which combines the method of moments (MoM) and the shooting and bouncing ray (SBR) for analyzing scattering of complex large structures. By applying the SBR method for the whole structures, a corrected incident field including not only the direct incident field but also the multi-bounce field from the SBR region contributes to the integral equation in the MoM region. For the SBR region, it also considers the interaction from MoM region and then a physical optics (PO) type integration is performed to calculate the scattered field. For complex electrically large electromagnetic problems, the proposed technique is more efficient and simpler to implement in a general-purpose computer code. Numerical results are presented to show the efficiency and accuracy of the method.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"1 1","pages":"306-308"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89529804","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}
Modeling and simulation in electromagnetics is reviewed. Fundamental terms and concepts are revisited. Examples are presented.
综述了电磁学中的建模与仿真。重新审视基本术语和概念。给出了实例。
{"title":"Electromagnetic modeling and simulation","authors":"L. Sevgi","doi":"10.1002/9781118716410","DOIUrl":"https://doi.org/10.1002/9781118716410","url":null,"abstract":"Modeling and simulation in electromagnetics is reviewed. Fundamental terms and concepts are revisited. Examples are presented.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"296 3 1","pages":"13-15"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86578785","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.2015.7052542
J. Simpson
Global three-dimensional finite-difference time-domain (FDTD) models of the Earth-ionosphere waveguide first appeared in the literature a decade ago. Over the past 10+ years, many advances have expanded the capabilities of these models and broadened their applicability. The capabilities are summarized in this Paper.
{"title":"A summary of the major global 3-D FDTD modeling capabilities to-date","authors":"J. Simpson","doi":"10.1109/COMPEM.2015.7052542","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052542","url":null,"abstract":"Global three-dimensional finite-difference time-domain (FDTD) models of the Earth-ionosphere waveguide first appeared in the literature a decade ago. Over the past 10+ years, many advances have expanded the capabilities of these models and broadened their applicability. The capabilities are summarized in this Paper.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"46 1 1","pages":"24-25"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89179988","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.2015.7052626
J. Qian, M. Xia
An approximate approach to simulate the scattering by a rotating hypersonic object with plasma sheath is developed. Following geometric modeling, computational fluid dynamic tool is adopted to resolve the complex dielectric constant distribution of the plasma sheath. Then the Born approximate method is applied to evaluate the influences of the plasma sheath on the scattered field. Finally, Doppler and micro-Doppler parameters are extracted by using the coherent sampling and chirp filtering techniques.
{"title":"Simulation of scattering by a rotating hypersonic object with plasma sheath","authors":"J. Qian, M. Xia","doi":"10.1109/COMPEM.2015.7052626","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052626","url":null,"abstract":"An approximate approach to simulate the scattering by a rotating hypersonic object with plasma sheath is developed. Following geometric modeling, computational fluid dynamic tool is adopted to resolve the complex dielectric constant distribution of the plasma sheath. Then the Born approximate method is applied to evaluate the influences of the plasma sheath on the scattered field. Finally, Doppler and micro-Doppler parameters are extracted by using the coherent sampling and chirp filtering techniques.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"20 1","pages":"258-260"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77550928","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.2015.7052572
Billy Wu, M. Okoniewski, C. Hayden
A pneumatically controlled patch antenna with resonant frequency that can be switched to either 3.05 GHz or 5 GHz is introduced. The resonant frequency of the device is determined by the dimension of the patch that is excited. To select a particular frequency, a pneumatically-operated copper-plated swinging arm is moved to cover one of two orthogonal slots on the ground plane. The uncovered slot allows energy to be coupled from the microstrip feedline to the corresponding dimension of the patch. Simulated results from HFSS are provided.
{"title":"Design of a pneumatically controlled frequency switchable patch antenna","authors":"Billy Wu, M. Okoniewski, C. Hayden","doi":"10.1109/COMPEM.2015.7052572","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052572","url":null,"abstract":"A pneumatically controlled patch antenna with resonant frequency that can be switched to either 3.05 GHz or 5 GHz is introduced. The resonant frequency of the device is determined by the dimension of the patch that is excited. To select a particular frequency, a pneumatically-operated copper-plated swinging arm is moved to cover one of two orthogonal slots on the ground plane. The uncovered slot allows energy to be coupled from the microstrip feedline to the corresponding dimension of the patch. Simulated results from HFSS are provided.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"1 1","pages":"107-108"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87140322","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.2015.7052620
Fang-Pin Xiang, Xing-Chang Wei, E. Li
In this paper, an equivalent magnetic dipole array assumed to reproduce the radiated emissions from PCBs, iterative source reconstruction method is employed to reconstruct the equivalent sources based on phaseless magnetic near field planar scanning with the initial phase provided by a novel repeated particle swarm optimization (RPSO) process. Once the equivalent sources are determined, radiated emissions from PCB can be obtained. Finally, numerical results are presented to illustrate the effectiveness of this approach.
{"title":"An iterative source reconstruction based method for radiated emissions prediction from PCBs","authors":"Fang-Pin Xiang, Xing-Chang Wei, E. Li","doi":"10.1109/COMPEM.2015.7052620","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052620","url":null,"abstract":"In this paper, an equivalent magnetic dipole array assumed to reproduce the radiated emissions from PCBs, iterative source reconstruction method is employed to reconstruct the equivalent sources based on phaseless magnetic near field planar scanning with the initial phase provided by a novel repeated particle swarm optimization (RPSO) process. Once the equivalent sources are determined, radiated emissions from PCB can be obtained. Finally, numerical results are presented to illustrate the effectiveness of this approach.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"30 1","pages":"241-243"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73556670","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.2015.7052632
Hui Liu, Xiongying Liu
A miniaturized differentially fed implantable Hilbert curve fractal antenna is investigated. The antenna operates at the center frequency of 405 MHz, which lies in the 402-405 MHz medical implant communication services (MICS) band, and has a bandwidth of 77 MHz (372-449 MHz) with differential reflection coefficient less than -10 dB. Differentially fed and fractal technologies are employed to suit the differential circuitries of radio frequency integrated circuits (RFICs) and miniaturize the size of proposed antenna, respectively. The dimensions of the antenna are 9.3 × 9.3 × 0.635 mm3. The Specific Absorption Rate (SAR), as one crucial factor for implantable antennas, is simulated in HFSS three layer phantom. The good performance guarantees the proposed antenna to be a candidate in biomedicai applications.
{"title":"A miniaturized differentially fed implantable Hilbert curve fractal antenna at MICS band","authors":"Hui Liu, Xiongying Liu","doi":"10.1109/COMPEM.2015.7052632","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052632","url":null,"abstract":"A miniaturized differentially fed implantable Hilbert curve fractal antenna is investigated. The antenna operates at the center frequency of 405 MHz, which lies in the 402-405 MHz medical implant communication services (MICS) band, and has a bandwidth of 77 MHz (372-449 MHz) with differential reflection coefficient less than -10 dB. Differentially fed and fractal technologies are employed to suit the differential circuitries of radio frequency integrated circuits (RFICs) and miniaturize the size of proposed antenna, respectively. The dimensions of the antenna are 9.3 × 9.3 × 0.635 mm3. The Specific Absorption Rate (SAR), as one crucial factor for implantable antennas, is simulated in HFSS three layer phantom. The good performance guarantees the proposed antenna to be a candidate in biomedicai applications.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"133 1","pages":"275-277"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89737615","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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