Pub Date : 2009-06-01DOI: 10.1109/APS.2009.5171952
A. García Aguilar, J. Fernandez, M. Sierra Castañer
A planar parabolic LH lens implemented with the mushroom structure has been used to feed a parallel-plate slot antenna at 7.5 GHz with a uniform plane wave. Parametrical researches to know how each unit cell geometrical parameter affects to the variations in the dispersion diagram of the mushroom structure have been done, and it has allowed to design a homogeneous and isotropic unit cell which works as a LH medium at 7.5 GHz. Then it has been demonstrated that if it is excited a cylindrical wave in the focus lens it is achieved a plane wave with a ripple lower than 5 dB within PPWG, and, thereby, that it is possible to enhance the parallel-plate slot antennas radiation efficiency. Furthermore, this kind of excitation circuits reduces the fabrication costs. In order to validate the unit cell design would be desirable to achieve a full-wave simulation with a real LH lens shaped by the mushroom structure of table 1, and, besides, to build a prototype with the simulated dimensions of the LH lens and the PPWG, for measuring the electrical field inside PPWG and the parallel-plate slot antenna radiation pattern. These simulations and measurements results will be presented in the AP-S meeting.
{"title":"Parallel-plate slot antenna with a planar left-handed lens for TEM plane wave excitation at 7.5 GHz","authors":"A. García Aguilar, J. Fernandez, M. Sierra Castañer","doi":"10.1109/APS.2009.5171952","DOIUrl":"https://doi.org/10.1109/APS.2009.5171952","url":null,"abstract":"A planar parabolic LH lens implemented with the mushroom structure has been used to feed a parallel-plate slot antenna at 7.5 GHz with a uniform plane wave. Parametrical researches to know how each unit cell geometrical parameter affects to the variations in the dispersion diagram of the mushroom structure have been done, and it has allowed to design a homogeneous and isotropic unit cell which works as a LH medium at 7.5 GHz. Then it has been demonstrated that if it is excited a cylindrical wave in the focus lens it is achieved a plane wave with a ripple lower than 5 dB within PPWG, and, thereby, that it is possible to enhance the parallel-plate slot antennas radiation efficiency. Furthermore, this kind of excitation circuits reduces the fabrication costs. In order to validate the unit cell design would be desirable to achieve a full-wave simulation with a real LH lens shaped by the mushroom structure of table 1, and, besides, to build a prototype with the simulated dimensions of the LH lens and the PPWG, for measuring the electrical field inside PPWG and the parallel-plate slot antenna radiation pattern. These simulations and measurements results will be presented in the AP-S meeting.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123336634","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 : 2009-06-01DOI: 10.1109/APS.2009.5171604
Youndo Tak, Jongmin Park, S. Nam
This paper proposes a new equivalent circuit for analyzing multi-element antenna structures. Each unit element of the antenna is considered a series RLC resonant circuit according to its impedance characteristic, and the antenna's entire structure is analyzed based on a mixed coupling equivalent circuit. The proposed circuit is applied to analyze a small two-element spherical antenna, and agrees well with the EM-simulation results.
{"title":"Equivalent circuit of a two-element spherical small antenna","authors":"Youndo Tak, Jongmin Park, S. Nam","doi":"10.1109/APS.2009.5171604","DOIUrl":"https://doi.org/10.1109/APS.2009.5171604","url":null,"abstract":"This paper proposes a new equivalent circuit for analyzing multi-element antenna structures. Each unit element of the antenna is considered a series RLC resonant circuit according to its impedance characteristic, and the antenna's entire structure is analyzed based on a mixed coupling equivalent circuit. The proposed circuit is applied to analyze a small two-element spherical antenna, and agrees well with the EM-simulation results.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123583111","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 : 2009-06-01DOI: 10.1109/APS.2009.5171888
D. Woo, Dong Hyun Lee, J. Ko, J. Baek, W. Park
In this paper, we presented a compact CRLH antenna which consists of an LH line and an RH line which have different frequencies. Thus dual band operation is possible, and the frequencies can be easily changed by altering LH or RH line parameters. Impedance matching can be adjusted using the stub length. Because of its small size, printed form, dual band operation, this antenna can be utilized in mobile applications that require various frequency ranges.
{"title":"Dual band compact CRLH antenna for mobile application","authors":"D. Woo, Dong Hyun Lee, J. Ko, J. Baek, W. Park","doi":"10.1109/APS.2009.5171888","DOIUrl":"https://doi.org/10.1109/APS.2009.5171888","url":null,"abstract":"In this paper, we presented a compact CRLH antenna which consists of an LH line and an RH line which have different frequencies. Thus dual band operation is possible, and the frequencies can be easily changed by altering LH or RH line parameters. Impedance matching can be adjusted using the stub length. Because of its small size, printed form, dual band operation, this antenna can be utilized in mobile applications that require various frequency ranges.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114884564","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 : 2009-06-01DOI: 10.1109/APS.2009.5171946
D. Arumugam, D. Engels
Recently, there has been much work in exploring the physics of negative refractive index (NRI) metamaterials [1, 2] as applicable experimentally. NRI metamaterials are fabricated materials that have negative permittivity (εr) and permeability (μr) values. These materials were first suggested in 1967 by Vaselago [3], where they were theoretically studied to reach the proposed conclusion that such mediums should be deemed as possessing negative refractive indexes since (n = −√Εμ). This proposal endured many criticisms, due to the unconventional utilization of physical concepts and non-existence of materials possessing these behaviors at that time. In the last decade, the study of NRI metamaterials (NRM) has experienced huge interests spanning both theoretical and experimental physicist. This recent excitement is due to the fact that NRM's have now been discovered experimentally through fabrication techniques utilizing the combination of a −μr and a −εr material(s) [1]. Furthermore, the prediction and verification by Pendry [4] that NRM's could be utilized as perfect lenses with higher resolutions than conventional lenses provided the required breakthrough.
{"title":"The utility of negative refractive index metamaterials as passive UHF RFID tag inlays","authors":"D. Arumugam, D. Engels","doi":"10.1109/APS.2009.5171946","DOIUrl":"https://doi.org/10.1109/APS.2009.5171946","url":null,"abstract":"Recently, there has been much work in exploring the physics of negative refractive index (NRI) metamaterials [1, 2] as applicable experimentally. NRI metamaterials are fabricated materials that have negative permittivity (εr) and permeability (μr) values. These materials were first suggested in 1967 by Vaselago [3], where they were theoretically studied to reach the proposed conclusion that such mediums should be deemed as possessing negative refractive indexes since (n = −√Εμ). This proposal endured many criticisms, due to the unconventional utilization of physical concepts and non-existence of materials possessing these behaviors at that time. In the last decade, the study of NRI metamaterials (NRM) has experienced huge interests spanning both theoretical and experimental physicist. This recent excitement is due to the fact that NRM's have now been discovered experimentally through fabrication techniques utilizing the combination of a −μr and a −εr material(s) [1]. Furthermore, the prediction and verification by Pendry [4] that NRM's could be utilized as perfect lenses with higher resolutions than conventional lenses provided the required breakthrough.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114915802","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 : 2009-06-01DOI: 10.1109/APS.2009.5171915
Jie-Bang Yan, J. Bernhard
In this paper, indoor DTV signal reception has been investigated under four different circumstances. Simulation results show that both window location and the presence of conductor-backed insulation in a house could cause a more than 35 dB fluctuation in the signal-to-noise ratio presented to the DTV receiver. Although the effects from window location could be mitigated in the real world environment (because of multipath propagation), the presence of conductor-backed insulation could significantly degrade the signal reception inside the house. A more detailed investigation of indoor DTV signal reception, such as the incorporation of metallic water pipes and actual DTV antennas in the simulation, and field measurements is currently in progress.
{"title":"Study of digital TV signal reception in domestic indoor environment","authors":"Jie-Bang Yan, J. Bernhard","doi":"10.1109/APS.2009.5171915","DOIUrl":"https://doi.org/10.1109/APS.2009.5171915","url":null,"abstract":"In this paper, indoor DTV signal reception has been investigated under four different circumstances. Simulation results show that both window location and the presence of conductor-backed insulation in a house could cause a more than 35 dB fluctuation in the signal-to-noise ratio presented to the DTV receiver. Although the effects from window location could be mitigated in the real world environment (because of multipath propagation), the presence of conductor-backed insulation could significantly degrade the signal reception inside the house. A more detailed investigation of indoor DTV signal reception, such as the incorporation of metallic water pipes and actual DTV antennas in the simulation, and field measurements is currently in progress.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114925513","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 : 2009-06-01DOI: 10.1109/APS.2009.5171859
P. Alitalo, O. Luukkonen, F. Bongard, J. Zurcher, J. Mosig, S. Tretyakov
A volumetric cloak composed of cylindrical two-dimensional transmission-line networks, has been studied with numerical simulations and measurements. The broadband cloaking effect obtained with this structure is confirmed for two different metallic objects.
{"title":"Broadband cloaking of selected objects in the microwave regime with a volumetric cloak comprising layered networks of transmission lines","authors":"P. Alitalo, O. Luukkonen, F. Bongard, J. Zurcher, J. Mosig, S. Tretyakov","doi":"10.1109/APS.2009.5171859","DOIUrl":"https://doi.org/10.1109/APS.2009.5171859","url":null,"abstract":"A volumetric cloak composed of cylindrical two-dimensional transmission-line networks, has been studied with numerical simulations and measurements. The broadband cloaking effect obtained with this structure is confirmed for two different metallic objects.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114961532","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 : 2009-06-01DOI: 10.1109/APS.2009.5171475
G. Goldman
A block diagram of a radar architecture to support a frequency scanning antenna with random length feed lines was developed. The feasibility of the architecture to perform target localization in position and velocity was investigated by analyzing 1-d antenna patterns and costs functions based upon an L2-norm. A large trade space exists between adding complexity to the radar system versus simplifying the signal processing. For this paper, a single realization of the system was selected, then simulated. The results indicate that the concept is feasible, but requires high SNR and a small number of targets for unambiguous results. This concept can be extended from a single array to multiple subarrays for improved performance and to reduced requirements on the delay line lengths and the percent bandwidth of the system with the cost of additional data acquisition hardware and increased computational complexity.
{"title":"Frequency scanning antenna concept with random feed lengths","authors":"G. Goldman","doi":"10.1109/APS.2009.5171475","DOIUrl":"https://doi.org/10.1109/APS.2009.5171475","url":null,"abstract":"A block diagram of a radar architecture to support a frequency scanning antenna with random length feed lines was developed. The feasibility of the architecture to perform target localization in position and velocity was investigated by analyzing 1-d antenna patterns and costs functions based upon an L2-norm. A large trade space exists between adding complexity to the radar system versus simplifying the signal processing. For this paper, a single realization of the system was selected, then simulated. The results indicate that the concept is feasible, but requires high SNR and a small number of targets for unambiguous results. This concept can be extended from a single array to multiple subarrays for improved performance and to reduced requirements on the delay line lengths and the percent bandwidth of the system with the cost of additional data acquisition hardware and increased computational complexity.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116235309","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 : 2009-06-01DOI: 10.1109/APS.2009.5172297
Rui Wang, Jianming Jin
In modern circuit design, hybrid field-circuit solvers that combine a full-wave analysis and a lumped circuit simulation become indispensable for accurate characterization of complicated microwave circuits that include both distributive and lumped circuit subsystems. In some applications, lumped circuit might have been predesigned and characterized compactly in terms of frequency-dependent multiport network matrices which are often referred to as lumped networks. Recently, lumped networks have been incorporated into a finite-difference time-domain (FDTD) scheme [1] and a hybrid time-domain integral equation solver [2]. In this paper, we present an accurate and efficient algorithm to incorporate multiport lumped networks into a hybrid field-circuit solver based on the time-domain finite-element method (TDFEM) [3]. By casting its admittance matrix into the time-stepping equations, a lumped-network subsystem is formulated and then interfaced with the FEM subsystem through the FEM edges and the circuit subsystem through circuit nodes. The lumped-network port voltages are explicitly set to be the same as those computed from the FEM (or circuit) subsystem while its port currents are used as impressed current excitations along the associated FEM edges (or through the related circuit nodes). Finally, all the lumped-network port variables are eliminated to form a global system for only the FEM and circuit unknowns. The proposed algorithm provides a systematic and efficient scheme for incorporating lumped networks into the TDFEM analysis and thus significant extends the modeling capability and improves the simulation efficiency of the existing hybrid field-circuit solver.
{"title":"Incorporation of frequency-dependent multiport lumped networks into a hybrid time-domain finite-element solver","authors":"Rui Wang, Jianming Jin","doi":"10.1109/APS.2009.5172297","DOIUrl":"https://doi.org/10.1109/APS.2009.5172297","url":null,"abstract":"In modern circuit design, hybrid field-circuit solvers that combine a full-wave analysis and a lumped circuit simulation become indispensable for accurate characterization of complicated microwave circuits that include both distributive and lumped circuit subsystems. In some applications, lumped circuit might have been predesigned and characterized compactly in terms of frequency-dependent multiport network matrices which are often referred to as lumped networks. Recently, lumped networks have been incorporated into a finite-difference time-domain (FDTD) scheme [1] and a hybrid time-domain integral equation solver [2]. In this paper, we present an accurate and efficient algorithm to incorporate multiport lumped networks into a hybrid field-circuit solver based on the time-domain finite-element method (TDFEM) [3]. By casting its admittance matrix into the time-stepping equations, a lumped-network subsystem is formulated and then interfaced with the FEM subsystem through the FEM edges and the circuit subsystem through circuit nodes. The lumped-network port voltages are explicitly set to be the same as those computed from the FEM (or circuit) subsystem while its port currents are used as impressed current excitations along the associated FEM edges (or through the related circuit nodes). Finally, all the lumped-network port variables are eliminated to form a global system for only the FEM and circuit unknowns. The proposed algorithm provides a systematic and efficient scheme for incorporating lumped networks into the TDFEM analysis and thus significant extends the modeling capability and improves the simulation efficiency of the existing hybrid field-circuit solver.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116237861","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 : 2009-06-01DOI: 10.1109/APS.2009.5172263
Junwei Dong, A. Zaghloul
Implementation of a microstrip microwave lens for 360-degree scanning is reported. The measurement results compared with full wave analysis demonstrate reasonable agreement.
报道了一种用于360度扫描的微带微波透镜的实现。实测结果与全波分析结果一致。
{"title":"Implementation of microwave lens for 360-degree scanning","authors":"Junwei Dong, A. Zaghloul","doi":"10.1109/APS.2009.5172263","DOIUrl":"https://doi.org/10.1109/APS.2009.5172263","url":null,"abstract":"Implementation of a microstrip microwave lens for 360-degree scanning is reported. The measurement results compared with full wave analysis demonstrate reasonable agreement.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"420 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116528410","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 : 2009-06-01DOI: 10.1109/APS.2009.5171572
P. Rocca, R. Haupt
In this work, a procedure for reducing the level of the sidelobes of large array antennas made of equal contiguous sub-arrays has been presented. Starting from the assumption that phase shifters are already present at each array element to steer the beam towards a desired direction, a phase control strategy based on the IPM has been profitably exploited to avoid the presence of high secondary lobes without the need of any additional hardware component. The results show the efficiency of the proposed approach.
{"title":"Low sidelobes in array antennas of equal sub-arrays through element phase control","authors":"P. Rocca, R. Haupt","doi":"10.1109/APS.2009.5171572","DOIUrl":"https://doi.org/10.1109/APS.2009.5171572","url":null,"abstract":"In this work, a procedure for reducing the level of the sidelobes of large array antennas made of equal contiguous sub-arrays has been presented. Starting from the assumption that phase shifters are already present at each array element to steer the beam towards a desired direction, a phase control strategy based on the IPM has been profitably exploited to avoid the presence of high secondary lobes without the need of any additional hardware component. The results show the efficiency of the proposed approach.","PeriodicalId":213759,"journal":{"name":"2009 IEEE Antennas and Propagation Society International Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122382395","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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