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2008 38th European Microwave Conference最新文献

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Design of Multibeam Dielectric Lens Antennas by Multi-objective Optimization 多波束介质透镜天线的多目标优化设计
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751505
T. Maruyama, K. Yamamori, Y. Kuwahara
{"title":"Design of Multibeam Dielectric Lens Antennas by Multi-objective Optimization","authors":"T. Maruyama, K. Yamamori, Y. Kuwahara","doi":"10.1109/EUMC.2008.4751505","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751505","url":null,"abstract":"We propose an effective method to design multibeam dielectric lens antennas. A genetic algorithm (GA) with multi-objective optimization is adopted to balance gain against sidelobe level. The lens shapes and the position of each feed are associated with chromosomes. The gain and sidelobe level are evaluated in a pareto ranking method. The method yields the distribution of the objective function values and the corresponding antenna structures.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124816284","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: 4
Novel Circularly Polarized Printed Crossed Dipole Array with Broad Axial Ratio Bandwidth 具有宽轴比带宽的新型圆极化印刷交叉偶极子阵列
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751473
J. Baik, Kyoung-Joo Lee, Won‐Sang Yoon, Tae‐Hak Lee, Young-Sik Kim
{"title":"Novel Circularly Polarized Printed Crossed Dipole Array with Broad Axial Ratio Bandwidth","authors":"J. Baik, Kyoung-Joo Lee, Won‐Sang Yoon, Tae‐Hak Lee, Young-Sik Kim","doi":"10.1109/EUMC.2008.4751473","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751473","url":null,"abstract":"The novel printed crossed 2times2 dipole array is proposed for broad axial ratio (AR) bandwidth. The broad bandwidth of axial ratio is due to a parasitic dipole crossing over the original dipole that is driven by a semi-rigid coaxial feed with the characteristic impedance of 75 Omega. The crossed dipole, a unit element of the dipole array proposed in this paper, can produce a broad circularly polarized (CP) operation by itself because of the sequentially rotated configuration. The measured 3 dB AR bandwidth is 39.2% and the gain is 13 dBi at the CP center frequency of 2.32 GHz. Details of the proposed dipole array design are described and both the simulation and the experimental results are presented and discussed.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125927724","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: 15
RF Energy Transmission for Sensor Transponders Deeply Implanted in Human Bodies 深度植入人体的传感器转发器射频能量传输
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751479
A. Hennig
{"title":"RF Energy Transmission for Sensor Transponders Deeply Implanted in Human Bodies","authors":"A. Hennig","doi":"10.1109/EUMC.2008.4751479","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751479","url":null,"abstract":"The use of sensor transponder technologies in medicine opens valuable possibilities in therapy of human cardiovascular system diseases, for example cardiac insufficiency. This paper deals with the question, what relevant effects exist concerning energy transmission through the human body and how they can be considered during the system design process. Parasitic effects in the transponder antenna are analysed. Finally, a combination of all effects is taken into account to analyse the frequency behaviour of the whole system. Practical examinations confirm the feasibility with a HF transmission system.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125307156","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
A Frequency Multiplexer/Demultiplexer for Dual Frequency Waveguide 一种用于双频波导的频率复用/解复用器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751377
Y. Kokubo, T. Kawai
{"title":"A Frequency Multiplexer/Demultiplexer for Dual Frequency Waveguide","authors":"Y. Kokubo, T. Kawai","doi":"10.1109/EUMC.2008.4751377","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751377","url":null,"abstract":"Conventional rectangular metallic waveguides are seldom used at frequencies higher than twice the cutoff frequency because of higher mode propagation. Single-mode propagation is available for a metallic waveguide using two arrayed dielectric rods. Although coaxial-waveguide converters are generally used for the introduction of electromagnetic wave to metallic waveguides, impedances cannot be matched by only one converter, because of the narrow bandwidth. Accordingly a frequency multiplexer or demultiplexer that connects to two coaxial-waveguide converter is necessary for impedance matching in each frequency range. S-parameters for three waveguide ports were calculated using Ansoft's HFSS. Although the frequency width for the reflection coefficient of each port is not so wide, port isolation is above 20 dB from 14 GHz to 17.5 GHz between two output ports.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125352748","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: 1
Novel Planar Antennas Using Circular, Curved and Straight Gratings for Conical-Sector Beam Patterns 采用圆形、弯曲和直线光栅的锥形扇形波束新型平面天线
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751508
S. Podilchak, A. Freundorfer, Y. Antar
{"title":"Novel Planar Antennas Using Circular, Curved and Straight Gratings for Conical-Sector Beam Patterns","authors":"S. Podilchak, A. Freundorfer, Y. Antar","doi":"10.1109/EUMC.2008.4751508","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751508","url":null,"abstract":"Planar antennas that utilize surface-waves (SWs) for leaky-wave (LW) excitation are investigated. Specifically, Yagi-Uda like surface-wave launchers (SWLs) are utilized as the antenna feed, exciting cylindrical SWs on a grounded dielectric slab. With the addition of circular, curved or straight metallic strip gratings, suitable conditions for LW field excitation are achieved. Essentially, the SWL and grating configurations can generate cylindrical LW field distributions within a confined region on the guiding surface. Such aperture fields can produce pencil and conical-sector beam patterns in the far field.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116227608","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: 4
Characterization of Dielectric Profiles by Using Microwave Delay Time Measurements 用微波延迟时间测量表征介电剖面
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751603
B. Will, M. Gerding
{"title":"Characterization of Dielectric Profiles by Using Microwave Delay Time Measurements","authors":"B. Will, M. Gerding","doi":"10.1109/EUMC.2008.4751603","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751603","url":null,"abstract":"Delay time measurements, e. g. time domain reflectometry (TDR), are a well-established method for the measurement of permittivity in various materials, especially soils. However, common measurement systems provide only one average value of the dielectric constant along the length of the TDR probe. This contribution presents two methods for the measurement of dielectric profiles independent of the structure of the material under test. The basis of these advanced delay time measurement technique is a waveguide, which is inserted into the material under test for obtaining measurements of the effective permittivity, and an obstacle, which can mechanically be moved along the probe. The obstacle serves as a discontinuity. Thus, by moving the obstacle the permittivity of the surrounding can be determined with a spatial resolution given by the step size of the obstacle displacement.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122391298","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
Dual-Layer Frequency-Selective Grid Polarizers on Thin-Film Substrates for THz Applications 薄膜基板上用于太赫兹应用的双层频率选择栅格偏振器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751628
Vladimir Yurchenko, John Anthony Murphy, John Barton, Jaap Verheggen, Ken Rodgers
{"title":"Dual-Layer Frequency-Selective Grid Polarizers on Thin-Film Substrates for THz Applications","authors":"Vladimir Yurchenko, John Anthony Murphy, John Barton, Jaap Verheggen, Ken Rodgers","doi":"10.1109/EUMC.2008.4751628","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751628","url":null,"abstract":"Dual-layer frequency-selective subwavelength grid polarizers on thin-film dielectric substrates are proposed for THz and sub-THz applications. The dual-layer grids possess enhanced (squared) polarizing efficiency at a sequence of discrete frequencies in reflection and within extended frequency bands in transmission as compared to conventional single grids.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114169905","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
Projection based methodology for designing non-periodic, planar arrays 基于投影的非周期平面阵列设计方法
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751783
M. C. Viganó, I. Lager, G. Toso, C. Mangenot, G. Caille
{"title":"Projection based methodology for designing non-periodic, planar arrays","authors":"M. C. Viganó, I. Lager, G. Toso, C. Mangenot, G. Caille","doi":"10.1109/EUMC.2008.4751783","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751783","url":null,"abstract":"An effective procedure for designing non-periodic, planar array antennas is discussed. It amounts to replicating by orthogonal projection two radiation mask tailored, non-periodic, linear arrays. Meeting the design specifications by these linear arrays guarantees their fulfillment in the entire field of view. The advocated methodology is illustrated by tackling a demanding design problem referring to a satellite communication application, requiring a narrow beam and low side-lobes levels.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121865271","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
Using an IQ Data to RF Power Transmitter to Realize a Highly-Efficient Transmit Chain for Current and Next-Generation Mobile Handsets 使用IQ数据射频功率发射器实现当前和下一代手机的高效传输链
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751518
G. Rawlins, D. Sorrells, R. Harlan
{"title":"Using an IQ Data to RF Power Transmitter to Realize a Highly-Efficient Transmit Chain for Current and Next-Generation Mobile Handsets","authors":"G. Rawlins, D. Sorrells, R. Harlan","doi":"10.1109/EUMC.2008.4751518","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751518","url":null,"abstract":"Combining and re-organizing the functions of multiple traditional transmitters and power amplifiers into a single unified multi-mode non-linear system results in improved performance and high efficiency. This in turn decreases the transmit chain footprint and lowers the bill of materials for applications such as mobile voice, data terminals, and femtocells. With this approach, RF designers will no longer be forced to choose between performance and efficiency, or reliability and cost, freeing them to design more optimal wireless systems.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121885532","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: 2
A 2.14 GHz 50 Watt 60% Power Added Efficiency GaN Current Mode Class D Power Amplifier 一种2.14 GHz 50瓦60%功率增益效率氮化镓电流模式D类功率放大器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751481
A. Al Tanany, A. Sayed, G. Boeck
{"title":"A 2.14 GHz 50 Watt 60% Power Added Efficiency GaN Current Mode Class D Power Amplifier","authors":"A. Al Tanany, A. Sayed, G. Boeck","doi":"10.1109/EUMC.2008.4751481","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751481","url":null,"abstract":"This paper presents a 50 W current mode class D (CMCD) power amplifier (PA) operating at 2.14 GHz. The PA is implemented using GaN pHEMT. The peak drain efficiency (iquest) is 62.7% and power added efficiency (PAE) is 60.3%. A resonator without an inductor was implemented to eliminate any loss that results from the low quality factors. The resonator uses narrow microstrip DC-feed lines located close to the drain leads which is used as resonator inductance. A model of the output capacitance (i.e.; Cds) was extracted from the die model and is used as a part of the resonator. Finally, a comparison between an ideal parallel LC with the proposed resonator was simulated to achieve the required impedance termination.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122077426","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: 18
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