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2007 IEEE/MTT-S International Microwave Symposium最新文献

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Composite Right/Left Handed Metamaterial Structures Composed of Dielectric Resonators and Parallel Mesh Plates 由介电谐振腔和平行网板组成的复合左/右超材料结构
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2010-07-01 DOI: 10.1587/TRANSELE.E93.C.1063
T. Ueda, N. Michishita, T. Itoh
{"title":"Composite Right/Left Handed Metamaterial Structures Composed of Dielectric Resonators and Parallel Mesh Plates","authors":"T. Ueda, N. Michishita, T. Itoh","doi":"10.1587/TRANSELE.E93.C.1063","DOIUrl":"https://doi.org/10.1587/TRANSELE.E93.C.1063","url":null,"abstract":"A new configuration of composite right/left handed (CRLH) metamaterial structure is proposed, which comprises of TE-resonant dielectric resonators and metallic parallel mesh plates. The balanced CRLH transmission lines are designed by adjusting the optimal distance between the mesh plates for a given size of the mesh windows. To confirm the fundamental operation, the transmission and far field radiation characteristics are simulated and measured for the one-dimensional structure. The numerical results show that the increase in the thickness of metallic mesh plates dramatically reduces the radiation efficiency. Nevertheless, the numerical simulation and measurement validate the continuous change in the phase flow along the waveguide from backward to forward directions with the operational frequency.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125173275","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}
引用次数: 11
Radar Based Concealed Threat Detector 基于雷达的隐蔽威胁探测器
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2008-05-13 DOI: 10.1117/12.817478
J. Hausner, N. West
{"title":"Radar Based Concealed Threat Detector","authors":"J. Hausner, N. West","doi":"10.1117/12.817478","DOIUrl":"https://doi.org/10.1117/12.817478","url":null,"abstract":"This paper describes a system that is capable of detecting dangerous objects carried under ones clothing from a standoff position. The system is autonomous and renders a decision regarding a persons results to an operator. That decision is reached on the basis of processing many parameters extracted from both the frequency and time domain responses of the radar return in an artificial neural net. This system has been extensively tested and been shown to be highly accurate.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"596 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126899246","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}
引用次数: 9
Numerical Dispersion of the ADI-FDTD Technique Including Lumped Models 包含集总模型的ADI-FDTD技术的数值色散
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-07-02 DOI: 10.1109/MWSYM.2007.380042
Chu Qing-xin, Chen Zhi-hui
{"title":"Numerical Dispersion of the ADI-FDTD Technique Including Lumped Models","authors":"Chu Qing-xin, Chen Zhi-hui","doi":"10.1109/MWSYM.2007.380042","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380042","url":null,"abstract":"The numerical dispersion characteristic of the extended ADI-FDTD algorithm including lumped models is systematically studied in this paper, and three common lumped models are investigated: resistor, capacitor and inductor, and their explicit, semi-implicit, and implicit temporal difference scheme are discussed. Theoretical results show that: (1) in the explicit and implicit case, the dispersion nature of a lumped resistor can be characterized by a series inductor and a series capacitor, respectively. (2) For capacitor, the dissipative nature of the explicit scheme can be replaced by a paralleling resistor. (3) If the semi-implicit or implicit scheme is applied to the lumped inductor, the dissipative inductor can be replaced by an equivalent circuit consisting of an inductor and a series resistor. Finally, a simple microstrip circuit including a lumped inductor is simulated to demonstrate the validity of the theoretical results.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124069284","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}
引用次数: 5
Universal Single-Layer Waveguide Power Divider for Slot Array Antenna Applications 用于槽阵天线的通用单层波导功率分配器
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380480
D. Deslandes, F. Boone, K. Wu
{"title":"Universal Single-Layer Waveguide Power Divider for Slot Array Antenna Applications","authors":"D. Deslandes, F. Boone, K. Wu","doi":"10.1109/MWSYM.2007.380480","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380480","url":null,"abstract":"A novel single-layer power divider realised in rectangular waveguide is proposed and demonstrated. It is composed of three parts: two interdigital sub-sections and an in-phase T-junction power divider. The topology can be used to design feed network having arbitrary specifications on the amplitude and phase distribution. An iterative technique is described to analyse the structure, where the divider is split into basic blocks. Large networks are then easily designed because the whole structure does not need to be simulated. Furthermore, the convergence is fast and five iterations are sufficient to obtain a variation below 0.1%. Experimental results are also presented. The 1:4 sub-section provides equal output power with 0.5 dB of insertion loss. The phase-shift between output ports is close to the specifications of -150deg at 30 GHz, with an error of less than 2deg.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120839047","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}
引用次数: 7
Ultra Linear Dual-band WLAN Front-End Module for 802.11 a/b/g/n Applications with Wide Voltage and Temperature Range Operation 超线性双频WLAN前端模块，适用于宽电压和温度范围的802.11 a/b/g/n应用
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380374
C.-W.P. Huang, C. Masse, C. Zelley, C. Christmas, T. Whittaker, J. Soricelli, W. Vaillancourt, A. Parolin
{"title":"Ultra Linear Dual-band WLAN Front-End Module for 802.11 a/b/g/n Applications with Wide Voltage and Temperature Range Operation","authors":"C.-W.P. Huang, C. Masse, C. Zelley, C. Christmas, T. Whittaker, J. Soricelli, W. Vaillancourt, A. Parolin","doi":"10.1109/MWSYM.2007.380374","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380374","url":null,"abstract":"A compact 7 times 8 times 1.1 mm3 dual-band Wireless LAN front-end module (FEM) having high linearity and wide temperature (-40 to 85degC) and voltage (2.7 to 4.5 V) operating ranges is presented. The FEM features 28 dB gain and 19.8 dBm at 54 Mbps with EVM < 3% and 230 mA for 2.4 to 2.5 GHz. For 4.9 to 5.9 GHz, the FEM delivers 25 dB gain and 16.5 dBm linear output power at 54 Mbps with EVM < 3% and 190 mA. The FEM's receive chains feature low insertion losses, 1.5 and 2.0 dB for low and high band respectively, and >25 dB RX to TX isolation. All these unique features simplify 802.11 a/b/g and 802.1 in radio designs.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121139984","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}
引用次数: 3
HTS Microstrip Hybrid Couplers for Radio Astronomy C-Band Receivers 用于射电天文c波段接收机的高温超导微带混合耦合器
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380222
Guoyong Zhang, M. Lancaster, N. Roddis
{"title":"HTS Microstrip Hybrid Couplers for Radio Astronomy C-Band Receivers","authors":"Guoyong Zhang, M. Lancaster, N. Roddis","doi":"10.1109/MWSYM.2007.380222","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380222","url":null,"abstract":"Critical upgrades of microwave hybrid directional couplers with wideband specifications in C band receiver for e-MERLIN telescope array at Jodrell Bank Observatory, UK, are required to achieve extremely low insertion loss and a reduction in receiver size. A High temperature superconducting (HTS) 3-section tandem coupled-line 3dB hybrid coupler and an HTS Lange coupler with a bandwidth of 53% and 48.5%, respectively, were designed on MgO substrates. The measured performance agrees well with the simulated one over the band of interest. The insertion loss of these HTS couplers are only 0.1-0.2dB as expected. The HTS Lange coupler has been successfully operated in the receiver on the telescope for over a year.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127534152","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}
引用次数: 3
Class-E Silicon Carbide VHF Power Amplifier e类碳化硅甚高频功率放大器
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380207
M. Franco, A. Katz
{"title":"Class-E Silicon Carbide VHF Power Amplifier","authors":"M. Franco, A. Katz","doi":"10.1109/MWSYM.2007.380207","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380207","url":null,"abstract":"Silicon carbide (SiC) Metal-Semiconductor Field Effects Transistors (MESFET) have been mostly employed in microwave and broadband radio frequency (RF) power amplifiers. This paper investigates an alternative use in high efficiency, class-E RF power amplifiers in the VHF range. Both simulation and experimental results are shown and demonstrate excellent agreement. A maximum drain dc to RF efficiency of 87% was predicted and 86.8 % achieved. The SiC MESFETs used in this project appear to offer significant advantages, particularly for space applications, over gallium arsenide (GaAs) transistors, which are inherently low voltage devices and more difficult to operate in class-E due to the high drain peak voltage occurring in this class of operation.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125872255","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}
引用次数: 21
Carbon Nanotube Based Dielectric for Enhanced RF MEMS Reliability 基于碳纳米管的介质提高射频MEMS可靠性
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380449
C. Bordas, K. Grenier, D. Dubuc, E. Flahaut, S. Pacchini, M. Paillard, J. Cazaux
{"title":"Carbon Nanotube Based Dielectric for Enhanced RF MEMS Reliability","authors":"C. Bordas, K. Grenier, D. Dubuc, E. Flahaut, S. Pacchini, M. Paillard, J. Cazaux","doi":"10.1109/MWSYM.2007.380449","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380449","url":null,"abstract":"This paper presents the fabrication and experimental results of capacitive MEM switches with a carbon nanotubes (CNT) based dielectric for the first time to our knowledge. Double wall nanotubes (DWNT) have been incorporated in the switch silicon nitride dielectric to modify its properties regarding the charging effect. The impact of the CNT density on the MEMS reliability has been demonstrated: a switch lifetime enhancement greater than two orders of magnitude has been achieved.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126825023","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}
引用次数: 25
A Novel High Efficiency and Linearity Power Amplifier with Over-Voltage Protection 一种具有过压保护的新型高效线性功率放大器
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380311
Haitao Zhang, Huai Gao, Yintat Ma, A. Forbes, R. Pavio, Guann-Pyng Li
{"title":"A Novel High Efficiency and Linearity Power Amplifier with Over-Voltage Protection","authors":"Haitao Zhang, Huai Gao, Yintat Ma, A. Forbes, R. Pavio, Guann-Pyng Li","doi":"10.1109/MWSYM.2007.380311","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380311","url":null,"abstract":"This paper presents a power amplifier (PA) design to improve linearity by using a novel power cell compensating the main nonlinear sources from the power devices and to improve the overall efficiency by a dynamic DC biasing circuit. An over-voltage protection circuit to ease output mismatch induced problems is included in this PA design. As a case study, this power amplifier is implemented with InGaP/GaAs HBT operating at 1880 MHz. The CDMA standard is used to evaluate its linearity and efficiency. The P1dB is improved from 30 dBm to 32 dBm and the cumulated output current is much improved in a wide output power range. The ACPR and ALTR at 28 dBm output power level are improved by 5 dB and 12 dB with the novel PA respectively. The over-voltage protection circuit works well under output mismatch conditions.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126847488","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}
引用次数: 3
A Monopulse Rotman Lens Phased Array for Enhanced Angular Resolution 提高角分辨率的单脉冲罗特曼透镜相控阵
2007 IEEE/MTT-S International Microwave Symposium Pub Date : 2007-06-03 DOI: 10.1109/MWSYM.2007.380136
L. Schulwitz, A. Mortazawi
{"title":"A Monopulse Rotman Lens Phased Array for Enhanced Angular Resolution","authors":"L. Schulwitz, A. Mortazawi","doi":"10.1109/MWSYM.2007.380136","DOIUrl":"https://doi.org/10.1109/MWSYM.2007.380136","url":null,"abstract":"A low cost monopulse phased array is described, which is based upon a Rotman lens and switched line phase shifting network. An amplitude comparison monopulse scheme is implemented, where the phased array is capable of scanning the sum and difference beams throughout a 60deg field of view. The sum beam directivity is better than 12 dB within a 6 GHz bandwidth at Ka band. Over 20 dB difference beam nulls were achieved throughout a 1 GHz bandwidth. The entire phase shifting circuit occupies a size of 62 mm by 62 mm, which is no larger than conventional Rotman lens circuitry.","PeriodicalId":213749,"journal":{"name":"2007 IEEE/MTT-S International Microwave Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122500129","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}
引用次数: 17
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