IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)最新文献
This paper presents a new diplexer using one-dimensional (1D) photonic band gap (PBG) structures to switch transmit/receive paths in a multiband transceiver antenna system. The 1D PBG structure consists of periodically etched holes on the ground plane along a microstrip-line. The new diplexer is optimized by parametric analysis, tapering and meandering of PBG bandstop filters, and full-wave simulation. A diplexer operating at four bands of 10, 12, 19, and 21 GHz is demonstrated with measured and simulated results. The new 1D PBG diplexer should be useful in multiband transceiver systems.
{"title":"A new PBG diplexer for a multiband transceiver antenna system","authors":"T. Yun, K. Chang","doi":"10.1109/APS.2001.959768","DOIUrl":"https://doi.org/10.1109/APS.2001.959768","url":null,"abstract":"This paper presents a new diplexer using one-dimensional (1D) photonic band gap (PBG) structures to switch transmit/receive paths in a multiband transceiver antenna system. The 1D PBG structure consists of periodically etched holes on the ground plane along a microstrip-line. The new diplexer is optimized by parametric analysis, tapering and meandering of PBG bandstop filters, and full-wave simulation. A diplexer operating at four bands of 10, 12, 19, and 21 GHz is demonstrated with measured and simulated results. The new 1D PBG diplexer should be useful in multiband transceiver systems.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126054542","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}
Although inverse scattering methods have reached a level of considerable sophistication in the past decades, their testing and verification remains predominantly numerical. By inverse scattering methods we understand those mathematical techniques that go beyond the trivial time-domain backpropagation or frequency-domain migration algorithms (sometimes called SAR imaging). The present study is concerned with the application of such inverse scattering methods to a practical problem of landmine detection using commercial ground penetrating radar (GPR) equipment. In particular, we investigate the performance of the so-called linearized inversion, i.e. the one where the description of the scattering process is subject to the Born approximation.
{"title":"Linearized multi-frequency inversion of ground penetrating radar data","authors":"N. Budko, P. M. van den Berg","doi":"10.1109/APS.2001.959446","DOIUrl":"https://doi.org/10.1109/APS.2001.959446","url":null,"abstract":"Although inverse scattering methods have reached a level of considerable sophistication in the past decades, their testing and verification remains predominantly numerical. By inverse scattering methods we understand those mathematical techniques that go beyond the trivial time-domain backpropagation or frequency-domain migration algorithms (sometimes called SAR imaging). The present study is concerned with the application of such inverse scattering methods to a practical problem of landmine detection using commercial ground penetrating radar (GPR) equipment. In particular, we investigate the performance of the so-called linearized inversion, i.e. the one where the description of the scattering process is subject to the Born approximation.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123751986","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 MFIE-based technique is applied an the propagation prediction of vertically polarized radio waves. The terrain profile is assumed smooth, such that backscattering is neglected and a forward scheme applied to obtain the induced surface currents. The MFIE is compared against the EFIE for several case studies. It is demonstrated that, under the present assumptions, the MFIE provides the same accuracy with a smaller number of basis functions, specially where the line-of-sight is obstructed.
{"title":"A MFIE-based prediction for UHF vertically-polarized wave propagation over irregular terrains","authors":"F. Moreira","doi":"10.1109/APS.2001.958890","DOIUrl":"https://doi.org/10.1109/APS.2001.958890","url":null,"abstract":"A MFIE-based technique is applied an the propagation prediction of vertically polarized radio waves. The terrain profile is assumed smooth, such that backscattering is neglected and a forward scheme applied to obtain the induced surface currents. The MFIE is compared against the EFIE for several case studies. It is demonstrated that, under the present assumptions, the MFIE provides the same accuracy with a smaller number of basis functions, specially where the line-of-sight is obstructed.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126783965","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}
This paper presents a new numerical method far the solution of linear Maxwell's equations in the time domain avoiding the conventional time stepping techniques. The spatial unknowns derived from a conventional spatial discretization, ie, FEM (finite element method) or FD (finite difference), of Maxwell's equations are expanded in the time domain by wavelets on the interval. This choice yields a new arrangement of the unknowns into a matrix (instead of the usual vector) and transforms the differential equations in time in an algebraic system of Lyapunov type for which memory requirements are nearly the same as that of the spatial unknowns and that gives the time evolution of the space quantities with better accuracy and lower CPU time resources than conventional stepping techniques.
{"title":"Solution of electromagnetic transients by wavelet expansion in the time domain","authors":"S. Barmada, N. Ida, M. Raugi","doi":"10.1109/APS.2001.959592","DOIUrl":"https://doi.org/10.1109/APS.2001.959592","url":null,"abstract":"This paper presents a new numerical method far the solution of linear Maxwell's equations in the time domain avoiding the conventional time stepping techniques. The spatial unknowns derived from a conventional spatial discretization, ie, FEM (finite element method) or FD (finite difference), of Maxwell's equations are expanded in the time domain by wavelets on the interval. This choice yields a new arrangement of the unknowns into a matrix (instead of the usual vector) and transforms the differential equations in time in an algebraic system of Lyapunov type for which memory requirements are nearly the same as that of the spatial unknowns and that gives the time evolution of the space quantities with better accuracy and lower CPU time resources than conventional stepping techniques.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116072639","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 novel -45/spl deg//+45/spl deg/ dual polarized microstrip antenna array for wireless applications within the 5.300-5.550 GHz range is designed and fabricated. The two ports of the antenna corresponding to -45/spl deg/ and +45/spl deg/ polarization are operated on the same frequency band. The simulations and experimental measurements of the VSWR and the isolation are presented. The relative bandwidth of 4.3% for VSWR <2 and isolation >16 dB are achieved.
{"title":"A -45/spl deg//+45/spl deg/ dual polarized microstrip antenna for wireless communication","authors":"X. Yao, W. Hong","doi":"10.1109/APS.2001.959497","DOIUrl":"https://doi.org/10.1109/APS.2001.959497","url":null,"abstract":"A novel -45/spl deg//+45/spl deg/ dual polarized microstrip antenna array for wireless applications within the 5.300-5.550 GHz range is designed and fabricated. The two ports of the antenna corresponding to -45/spl deg/ and +45/spl deg/ polarization are operated on the same frequency band. The simulations and experimental measurements of the VSWR and the isolation are presented. The relative bandwidth of 4.3% for VSWR <2 and isolation >16 dB are achieved.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"606 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116463430","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}
Intervallic wavelets were applied to the solutions of boundary integral equations for electromagnetic problems at low frequency. Very sparse impedance matrices were obtained with this method. In fact, the zero elements of the matrices are identified directly, without using a truncation scheme to force those elements with very small numerical values to become identically zero through the use of an artificially established threshold. Further, the majority of matrix elements are evaluated directly, without performing numerical integration procedures such as the Gaussian quadrature. This method yields enormous savings in computational effort compared to the prior methods, particularly for large matrices. Numerical examples were analyzed and results presented in this paper to demonstrate the effectiveness of the method. These results of the single sphere case agreed well with the moment method solutions.
{"title":"Application of intervallic wavelets to the problem of EM scattering on multiple bodies","authors":"M. Toupikov, G. Pan, T.K. Gilbert","doi":"10.1109/APS.2001.959549","DOIUrl":"https://doi.org/10.1109/APS.2001.959549","url":null,"abstract":"Intervallic wavelets were applied to the solutions of boundary integral equations for electromagnetic problems at low frequency. Very sparse impedance matrices were obtained with this method. In fact, the zero elements of the matrices are identified directly, without using a truncation scheme to force those elements with very small numerical values to become identically zero through the use of an artificially established threshold. Further, the majority of matrix elements are evaluated directly, without performing numerical integration procedures such as the Gaussian quadrature. This method yields enormous savings in computational effort compared to the prior methods, particularly for large matrices. Numerical examples were analyzed and results presented in this paper to demonstrate the effectiveness of the method. These results of the single sphere case agreed well with the moment method solutions.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122919579","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}
J. Teniente-Vallinas, R. Gonzalo-Garcia, C. del-Rio-Bocio
A corrugated horn antenna design with more than 40% bandwidth is proposed in this paper. The measured radiated field patterns have good agreement with the simulated ones. This antenna can be used in applications that require extremely wide bandwidth with low sidelobes and low crosspolar levels, with not very strong return loss requirements.
{"title":"Ultra-wide band corrugated Gaussian profiled horn antenna design","authors":"J. Teniente-Vallinas, R. Gonzalo-Garcia, C. del-Rio-Bocio","doi":"10.1109/APS.2001.959727","DOIUrl":"https://doi.org/10.1109/APS.2001.959727","url":null,"abstract":"A corrugated horn antenna design with more than 40% bandwidth is proposed in this paper. The measured radiated field patterns have good agreement with the simulated ones. This antenna can be used in applications that require extremely wide bandwidth with low sidelobes and low crosspolar levels, with not very strong return loss requirements.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"34 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114059632","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}
In this paper, we investigate the electromagnetic scattering by a multilayer circular gyrotropic bianisotropic cylinder in free space. The coupled wave equations of longitudinal field components are derived, and the transversal fields components are obtained from the longitudinal ones. The eigenfunction expansion method is used to solve the scattering problem after decoupling the coupled wave equations. Numerical results including RCS and near-zone fields are presented.
{"title":"Electromagnetic scattering by a multilayer gyrotropic bianisotropic cylinder","authors":"Ming Zhang, Lewei Li, T. Yeo, M. Leong","doi":"10.1109/APS.2001.959672","DOIUrl":"https://doi.org/10.1109/APS.2001.959672","url":null,"abstract":"In this paper, we investigate the electromagnetic scattering by a multilayer circular gyrotropic bianisotropic cylinder in free space. The coupled wave equations of longitudinal field components are derived, and the transversal fields components are obtained from the longitudinal ones. The eigenfunction expansion method is used to solve the scattering problem after decoupling the coupled wave equations. Numerical results including RCS and near-zone fields are presented.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114277517","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}
In wireless communications, there are two problems that the systems suffer from, one is the inter-symbol interference (ISI), the other is the cochannel interference (CCI). Space-time adaptive processing (STAP) is considered to provide superior performance in suppressing both the ISI and the CCI. To reduce the complexity and the cost, using switched parasitic elements or the parasitic elements with variable reactances to change the mutual coupling and so as to provide spatial diversity attracts much attention. The electronically steerable passive array radiator (ESPAR) antenna is one of the parasitic elements based single port antennas with several variable reactances. We propose a single port ESPAR antenna-based space-time adaptive filtering. Unlike the nulls formed by the conventional adaptive antenna, here we develop the potential of jointly using the variable pattern and the temporal equalizer to realize space-time adaptive filtering.
{"title":"Single-port electronically steerable passive array radiator antenna based space-time adaptive filtering","authors":"K. Yang, T. Ohira","doi":"10.1109/APS.2001.959389","DOIUrl":"https://doi.org/10.1109/APS.2001.959389","url":null,"abstract":"In wireless communications, there are two problems that the systems suffer from, one is the inter-symbol interference (ISI), the other is the cochannel interference (CCI). Space-time adaptive processing (STAP) is considered to provide superior performance in suppressing both the ISI and the CCI. To reduce the complexity and the cost, using switched parasitic elements or the parasitic elements with variable reactances to change the mutual coupling and so as to provide spatial diversity attracts much attention. The electronically steerable passive array radiator (ESPAR) antenna is one of the parasitic elements based single port antennas with several variable reactances. We propose a single port ESPAR antenna-based space-time adaptive filtering. Unlike the nulls formed by the conventional adaptive antenna, here we develop the potential of jointly using the variable pattern and the temporal equalizer to realize space-time adaptive filtering.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122197319","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}
The scattering parameters of frequency selective surfaces (FSS) structures composed of rectangular conducting patches between dielectric anisotropic layers were investigated, in the spectral domain. Numerical results were obtained as function of the structural parameters. It has been observed that the use of anisotropic substrates increases the design flexibility of FSS structures on dielectric layers. The analyzed structure can be used in the development of wideband microwave filters.
{"title":"Scattering parameters of a frequency selective surface between anisotropic dielectric layers for incident co-polarized plane waves","authors":"A. Campos, A. D’assunção","doi":"10.1109/APS.2001.959478","DOIUrl":"https://doi.org/10.1109/APS.2001.959478","url":null,"abstract":"The scattering parameters of frequency selective surfaces (FSS) structures composed of rectangular conducting patches between dielectric anisotropic layers were investigated, in the spectral domain. Numerical results were obtained as function of the structural parameters. It has been observed that the use of anisotropic substrates increases the design flexibility of FSS structures on dielectric layers. The analyzed structure can be used in the development of wideband microwave filters.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116880843","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}
IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)
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