Pub Date : 2007-06-09DOI: 10.1109/APS.2007.4396904
V. Rawat, Jin-Fa Lee
In this contribution we focus our attention on the cement variables of the DDM and consider their theoretical and practical treatment. We first determine the correct functional space of the continuous variables and then examine two possible representations in the VFEM. One choice is shown to provide superior solver convergence though its use results in sub-optimal error convergence. We then propose and validate a remedy to this problem by special treatment of non-planar interfaces. Finally, we demonstrate the scalability of the resulting method.
{"title":"Treatment of cement variables in the domain decomposition method for Maxwell’s equations","authors":"V. Rawat, Jin-Fa Lee","doi":"10.1109/APS.2007.4396904","DOIUrl":"https://doi.org/10.1109/APS.2007.4396904","url":null,"abstract":"In this contribution we focus our attention on the cement variables of the DDM and consider their theoretical and practical treatment. We first determine the correct functional space of the continuous variables and then examine two possible representations in the VFEM. One choice is shown to provide superior solver convergence though its use results in sub-optimal error convergence. We then propose and validate a remedy to this problem by special treatment of non-planar interfaces. Finally, we demonstrate the scalability of the resulting method.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123890469","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 : 2007-06-09DOI: 10.1109/APS.2007.4396744
J. Encinar, M. Arrebola
This paper demonstrates that cross polarization in offset reflectarrays can be significantly reduced by properly adjusting the separation between layers and the patch dimensions in a three-layer reflectarray. The technique has been applied to design a 1-m reflectarray for a South American coverage seen from a satellite located at 61deg west stationary orbit.
{"title":"Reduction of cross-polarization in contoured beam reflectarrays using a three-layer configuration","authors":"J. Encinar, M. Arrebola","doi":"10.1109/APS.2007.4396744","DOIUrl":"https://doi.org/10.1109/APS.2007.4396744","url":null,"abstract":"This paper demonstrates that cross polarization in offset reflectarrays can be significantly reduced by properly adjusting the separation between layers and the patch dimensions in a three-layer reflectarray. The technique has been applied to design a 1-m reflectarray for a South American coverage seen from a satellite located at 61deg west stationary orbit.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123919260","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 : 2007-06-09DOI: 10.1109/APS.2007.4396079
Zhong Ji, T. Hebron
{"title":"Optimization of a quad-band IFA main antenna to improve the efficiency and isolation with a ceramic GPS antenna in handset antenna designs","authors":"Zhong Ji, T. Hebron","doi":"10.1109/APS.2007.4396079","DOIUrl":"https://doi.org/10.1109/APS.2007.4396079","url":null,"abstract":"","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123921819","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 : 2007-06-09DOI: 10.1109/APS.2007.4396594
D. Gray, H. Tsuji, M. Suzuki, R. Miura
Localisation by direction of arrival (DOA) array is one of the possible future applications for stratospheric platform systems. Such localisation systems are envisioned to be applicable to post-disaster search and rescue, wildlife tracking, traffic control, and identification of illegal broadcasters by law enforcement. A novel DOA architecture (Miura et al., 2006) was installed across the wings of a prototype stratospheric aircraft and flown in November 2006. A novel, higher order mode microstrip patch antenna suitable for use as a ground station reference for the DOA demonstration is introduced.
到达方向定位(DOA)阵列是未来平流层平台系统可能的应用之一。这种定位系统预计将适用于灾后搜救、野生动物追踪、交通管制和执法部门识别非法广播。一种新的DOA架构(Miura et al.， 2006)被安装在一架原型平流层飞机的机翼上，并于2006年11月试飞。介绍了一种新型的高阶微带贴片天线，可作为地面站的DOA验证参考。
{"title":"Beacon microstrip patch antenna for DOA demonstration from prototype stratospheric aircraft","authors":"D. Gray, H. Tsuji, M. Suzuki, R. Miura","doi":"10.1109/APS.2007.4396594","DOIUrl":"https://doi.org/10.1109/APS.2007.4396594","url":null,"abstract":"Localisation by direction of arrival (DOA) array is one of the possible future applications for stratospheric platform systems. Such localisation systems are envisioned to be applicable to post-disaster search and rescue, wildlife tracking, traffic control, and identification of illegal broadcasters by law enforcement. A novel DOA architecture (Miura et al., 2006) was installed across the wings of a prototype stratospheric aircraft and flown in November 2006. A novel, higher order mode microstrip patch antenna suitable for use as a ground station reference for the DOA demonstration is introduced.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124170136","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 : 2007-06-09DOI: 10.1109/APS.2007.4395461
A. Edalati, T. Denidni, H. Boutayeb
Electromagnetic bang gap (EBG) materials are periodic structures characterized by forbidden propagation of electromagnetic waves in their band-gap and by the ability to open localized modes inside the band-gap by introducing defects. Cylindrical electromagnetic band gap (CEBG) structures are radially and circularly periodic, and they present pass-band and stop-band to cylindrical electromagnetic waves. By applying a horn-shaped defect in these structures, it has been shown that a re-configurable directive pattern can be obtained. In (P. Ratasjack et al., 2004), experimental results for a reconfigurable CEBG-based antenna have been presented, whereas in (H. Boutayeb et al., 2006), an analysis of the transmission coefficient of CEBG structures and experimental results for a CEBG directive antenna have been proposed. In (H. Boutayeb et al., 2006), a new defect configuration has been proposed for reducing the power supply, but this solution leads to a narrower band. In this paper, new defect configurations are analyzed in order to reduce the number of active elements and the required power supply in CEBG-based agile antennas. The solution with the widest bandwidth is indicated.
电磁弹隙(EBG)材料是一种周期性结构，其特点是电磁波在其带隙中被禁止传播，并且能够通过引入缺陷在带隙内打开局域模式。圆柱形电磁带隙结构具有径向周期性和圆周期性，对圆柱形电磁波具有通带和阻带特性。通过在这些结构中加入角状缺陷，可以获得可重构的指令模式。在(P. Ratasjack等人，2004)中，提出了基于CEBG的可重构天线的实验结果，而在(H. Boutayeb等人，2006)中，提出了CEBG结构的传输系数分析和CEBG指令天线的实验结果。在(H. Boutayeb et al.， 2006)中，提出了一种新的缺陷配置来减少功率供应，但这种解决方案导致更窄的频带。为了减少基于cebg的敏捷天线的有源元件数量和所需的电源，本文分析了新的缺陷配置。给出了带宽最宽的解。
{"title":"Analysis of different defect configurations in CEBG structures for directive patterns","authors":"A. Edalati, T. Denidni, H. Boutayeb","doi":"10.1109/APS.2007.4395461","DOIUrl":"https://doi.org/10.1109/APS.2007.4395461","url":null,"abstract":"Electromagnetic bang gap (EBG) materials are periodic structures characterized by forbidden propagation of electromagnetic waves in their band-gap and by the ability to open localized modes inside the band-gap by introducing defects. Cylindrical electromagnetic band gap (CEBG) structures are radially and circularly periodic, and they present pass-band and stop-band to cylindrical electromagnetic waves. By applying a horn-shaped defect in these structures, it has been shown that a re-configurable directive pattern can be obtained. In (P. Ratasjack et al., 2004), experimental results for a reconfigurable CEBG-based antenna have been presented, whereas in (H. Boutayeb et al., 2006), an analysis of the transmission coefficient of CEBG structures and experimental results for a CEBG directive antenna have been proposed. In (H. Boutayeb et al., 2006), a new defect configuration has been proposed for reducing the power supply, but this solution leads to a narrower band. In this paper, new defect configurations are analyzed in order to reduce the number of active elements and the required power supply in CEBG-based agile antennas. The solution with the widest bandwidth is indicated.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123667893","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 : 2007-06-09DOI: 10.1109/APS.2007.4396722
A. Edalati, T. Denidni
In modern wireless communication systems, agile antennas with a configurable beamwidth have been attracted a lot of interest. To fulfill several requirements, various techniques for designing variable-beamwidth antennas have recently been proposed. In this work, the authors propose a new cylindrical electromagnetic band gap (CEBG) structure for modifying the radiation beamwidth. CEBG structures composed of metallic wires have been introduced in (H. Boutayeb, et al., 2006). These structures are radialy and circularly periodic and present pass-bands and stop-bands to TM cylindrical electromagnetic waves when they are excited in their center. By introducing a defect and modifying the number of the periodic surfaces, a directive radiation with variable beamwidth can be obtained. By studying the field distribution in the H-plane, significant size reduction and power supply were achieved. The proposed structure shows good performances in terms of beamwidth configurability with less power supply and less active elements. The obtained results is presented and discussed in the paper.
{"title":"A new configurable beamwidth antenna using cylindrical electromagnetic Band Gap","authors":"A. Edalati, T. Denidni","doi":"10.1109/APS.2007.4396722","DOIUrl":"https://doi.org/10.1109/APS.2007.4396722","url":null,"abstract":"In modern wireless communication systems, agile antennas with a configurable beamwidth have been attracted a lot of interest. To fulfill several requirements, various techniques for designing variable-beamwidth antennas have recently been proposed. In this work, the authors propose a new cylindrical electromagnetic band gap (CEBG) structure for modifying the radiation beamwidth. CEBG structures composed of metallic wires have been introduced in (H. Boutayeb, et al., 2006). These structures are radialy and circularly periodic and present pass-bands and stop-bands to TM cylindrical electromagnetic waves when they are excited in their center. By introducing a defect and modifying the number of the periodic surfaces, a directive radiation with variable beamwidth can be obtained. By studying the field distribution in the H-plane, significant size reduction and power supply were achieved. The proposed structure shows good performances in terms of beamwidth configurability with less power supply and less active elements. The obtained results is presented and discussed in the paper.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120889419","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 : 2007-06-09DOI: 10.1109/APS.2007.4396561
F. Andriulli, K. Cools, F. Olyslager, E. Michielssen
In this paper, we present new techniques for stabilizing marching on in time-based time domain integral equation (MOT-TDIE) solvers that distinguish themselves from the above ones in that they operate hand in glove with recently developed Calderon-based MOT-TDIE preconditioners. The proposed preconditioners provide simple mechanisms for eliminating "resonant" and "DC" eigenvalues from combined and electric field TDIEs, thereby rendering them immune from late-time ringing and non-oscillatory growth of their solutions. Numerical results that show the validity and the effectiveness of the proposed equations are presented.
{"title":"Calderón stabilized time domain integral equation solvers","authors":"F. Andriulli, K. Cools, F. Olyslager, E. Michielssen","doi":"10.1109/APS.2007.4396561","DOIUrl":"https://doi.org/10.1109/APS.2007.4396561","url":null,"abstract":"In this paper, we present new techniques for stabilizing marching on in time-based time domain integral equation (MOT-TDIE) solvers that distinguish themselves from the above ones in that they operate hand in glove with recently developed Calderon-based MOT-TDIE preconditioners. The proposed preconditioners provide simple mechanisms for eliminating \"resonant\" and \"DC\" eigenvalues from combined and electric field TDIEs, thereby rendering them immune from late-time ringing and non-oscillatory growth of their solutions. Numerical results that show the validity and the effectiveness of the proposed equations are presented.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120892420","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 : 2007-06-09DOI: 10.1109/APS.2007.4396058
B. Justice, V. Nguyen, S. H. Yonak, J. Kim, D.R. Smith
Microwave propagation through an electric-field-coupled metamaterial lens with a refractive index gradient is experimentally investigated. A gradient in the refractive index of the metamaterial is introduced by continuous tuning of a single parameter in the metamaterial elements. Experimental field maps, acquired in a planar waveguide, demonstrate that the planar gradient index lens can be used to collimate radiation from a line source, thereby forming a beam.
{"title":"Electric-field-coupled metamaterials for microwave beam formation","authors":"B. Justice, V. Nguyen, S. H. Yonak, J. Kim, D.R. Smith","doi":"10.1109/APS.2007.4396058","DOIUrl":"https://doi.org/10.1109/APS.2007.4396058","url":null,"abstract":"Microwave propagation through an electric-field-coupled metamaterial lens with a refractive index gradient is experimentally investigated. A gradient in the refractive index of the metamaterial is introduced by continuous tuning of a single parameter in the metamaterial elements. Experimental field maps, acquired in a planar waveguide, demonstrate that the planar gradient index lens can be used to collimate radiation from a line source, thereby forming a beam.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114073907","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 : 2007-06-09DOI: 10.1109/APS.2007.4396346
A. H. Panaretos, R. Diaz, J. Aberle
A sixth order isotropic FDTD algorithm has been described. The algorithm can be of great importance in cases where high global isotropy is required such as radiation and cavity related problems. The algorithm is also very attractive for single frequency problems where dispersion can be easily eliminated by introducing correcting artificial material dispersion.
{"title":"A higher order isotropic FDTD scheme using artificial dispersion via controllable higher order time derivatives","authors":"A. H. Panaretos, R. Diaz, J. Aberle","doi":"10.1109/APS.2007.4396346","DOIUrl":"https://doi.org/10.1109/APS.2007.4396346","url":null,"abstract":"A sixth order isotropic FDTD algorithm has been described. The algorithm can be of great importance in cases where high global isotropy is required such as radiation and cavity related problems. The algorithm is also very attractive for single frequency problems where dispersion can be easily eliminated by introducing correcting artificial material dispersion.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114220984","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 : 2007-06-09DOI: 10.1109/APS.2007.4395493
A. Rawal, N. Karmakar
{"title":"Dual-planar l-shaped RFID tag antenna","authors":"A. Rawal, N. Karmakar","doi":"10.1109/APS.2007.4395493","DOIUrl":"https://doi.org/10.1109/APS.2007.4395493","url":null,"abstract":"","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116297058","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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