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1990 20th European Microwave Conference最新文献

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On the Design of a 16QAM Modulator in the Microwave Range for Radio Link Systems 无线电链路系统微波波段16QAM调制器的设计
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336076
Franz Mueller
{"title":"On the Design of a 16QAM Modulator in the Microwave Range for Radio Link Systems","authors":"Franz Mueller","doi":"10.1109/EUMA.1990.336076","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336076","url":null,"abstract":"The design of a 16QAM modulator as a simple planar microstrip structure for the 6.7 GHz range is described. Results gained by simulation and measurements are presented and give courage to make use of direct modulating the rf carrier signal to be transmitted.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127768765","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
Planar Quasi-Optical Circuit Technology 平面准光电路技术
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336172
T. Itoh
{"title":"Planar Quasi-Optical Circuit Technology","authors":"T. Itoh","doi":"10.1109/EUMA.1990.336172","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336172","url":null,"abstract":"Recent advances in planar integrated circuit configurations implementing the quasi-optical concepts and functions accompanied by several groups in the U. S. are summarized. As the frequency of operation is increased toward millimeter-waves and beyond, new circuit configurations are needed to meet a specific challenge. After a brief historical review of quasi-optical mixers, more recent efforts in developing the active quasi-optical planar integrated circuits and components are described. This circuit configuration can exploit the maximum capability of active devices which exhibits ever decreasing performance as the frequency is increased. Simplicity of the circuit and greater flexibility of design can make this technology attractive also at lower microwave frequencies where cost effectiveness is often more emphasized rather than overall performance. Examples include quasi-optical oscillators, power combiners and second harmonic generators.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"312 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133272623","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
Wide-Bandwidth Phased Arrays using Random Subarraying 基于随机子阵的宽带相控阵
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336050
A. Goffer, M. Kam, P. Herczfeld
{"title":"Wide-Bandwidth Phased Arrays using Random Subarraying","authors":"A. Goffer, M. Kam, P. Herczfeld","doi":"10.1109/EUMA.1990.336050","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336050","url":null,"abstract":"Beam steering with phased arrays requires the use of true-time-delay devices when communicating a wideband signal. In many applications, this requirement cannot be met, due to size and cost limitations, and the array is divided into subarrays: each element is implemented with a phase shifter (frequency independent phase-shifting device) and each subarray is fed through a single true time delay. The common implementation is with identical contiguous subarrays, which, due to periodicity, cause high sidelobes and grating lobes. We suggest to design divided arrays by trying random sizes of subarrays, with random locations of their centers, in order to avoid periodicity. We develop closed-form expressions for the average array factor, the average power pattern and its variance.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288148","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
Multipath Effects Observed over Long Hop Hilly Terrain Line-Of-Sight Microwave Links 在长跳丘陵地形视距微波链路上观察到的多径效应
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336269
D. Rao, S. Rao, K. S. Ravi, K. Reddy, M. Murthy
{"title":"Multipath Effects Observed over Long Hop Hilly Terrain Line-Of-Sight Microwave Links","authors":"D. Rao, S. Rao, K. S. Ravi, K. Reddy, M. Murthy","doi":"10.1109/EUMA.1990.336269","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336269","url":null,"abstract":"Microwave signal strength measurements have been carried out for a period of 3 years over two long hop line-of-sight microwave links situated in southern India between Elagiri-Tirumala and Pallavaram-Tirumala over a pathlength of 142 and 117.5 Km. The recordings have been supplemented by the acoustic sounding data being probed at Tirupati. Deep fading periods are correlated with different atmospheric structures and also with the radiosonde data collected from the India Meteorological Department observatories. It is found that most of the fading observed is associated with the layered structures that are below the transmitter and can exist upto a height of 500 metres. It is suggested that since high fading is associated with the layers in the regions below the transmitter height, the antennas should be lifted upwards to reduce the fading during the convective conditions.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"318 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133352622","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: 0
100 μs Microwave Optical Delay Line using Directly Moiulated Lasers 直接调制激光的100 μs微波光延迟线
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336120
F. Deborgies, G. Chevalier, Y. Combemale, P. Mailot, P. Richin, P. Blanchard, O. Maas
{"title":"100 μs Microwave Optical Delay Line using Directly Moiulated Lasers","authors":"F. Deborgies, G. Chevalier, Y. Combemale, P. Mailot, P. Richin, P. Blanchard, O. Maas","doi":"10.1109/EUMA.1990.336120","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336120","url":null,"abstract":"Using a 20 kilometer long optical link with direct modulation of BH and DEB laser, we demonstrated the lowest insertion losses - of the order of 48 dB ever reported at microwave frequencies up to C band.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134364615","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
Complex Modes in Shielded Coplanar Waveguide 屏蔽共面波导中的复杂模式
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336258
M. Leong, P. Kooi, Benny Widjojo, T. Yeo
{"title":"Complex Modes in Shielded Coplanar Waveguide","authors":"M. Leong, P. Kooi, Benny Widjojo, T. Yeo","doi":"10.1109/EUMA.1990.336258","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336258","url":null,"abstract":"The existence of complex modes in the lossless symmetrical shielded coplanar waveguide is demonstrated. Complex modes were found to occur only within a range of frequency and structural parameters. It is shown that exclusion of these modes in the analysis of coplanar waveguide discontinuities can cause the input reflection and transmission coefficients to converge to incorrect values, thus highlighting their importance in such problems.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115786704","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
Phase-Retrieval Far-Field Pattern Prediction and Metrology of a MM-Wave Reflector Antenna from a Planar Near-Field Intensity Scan 基于平面近场扫描的毫米波反射天线相位反演远场方向图预测与测量
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336066
G. Junkin, A. Anderson, Y. D. Cheung
{"title":"Phase-Retrieval Far-Field Pattern Prediction and Metrology of a MM-Wave Reflector Antenna from a Planar Near-Field Intensity Scan","authors":"G. Junkin, A. Anderson, Y. D. Cheung","doi":"10.1109/EUMA.1990.336066","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336066","url":null,"abstract":"With trends towards utilisation of millimetre wavelength1s, the m11etrology of reflector antennas via holographic-based techniques will be expensive, and perhaps unreliable, because of the requirement for a phase reference channel and the difficulty of achieving accurate phase measurements. An alternative measurement strategy, requiring only intensity, has recently gainied credability with the successful application of phase-retrieval algorithms (Anderson & Sali [1]). In its most convenient form, phase-retrieval requires only a single intensity pattern (Gardenier [2], McCormack et al [3]) and the extention of this objective to planar near-field scanning is considered here.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132562610","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
Electric Field Singularities in Microwave Integrated Circuits (MIC) 微波集成电路(MIC)中的电场奇点
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336145
S. Marchetti, T. Rozzi
{"title":"Electric Field Singularities in Microwave Integrated Circuits (MIC)","authors":"S. Marchetti, T. Rozzi","doi":"10.1109/EUMA.1990.336145","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336145","url":null,"abstract":"90° and 270° plane metallic corners occur in many discontinuties in microwave integrated circuits (MIC), such as impedance steps. The determination of the scattering matrix of the step by variational methods, for instance, requires some knowledge of E-field at the discontinuity. In particular, the introduction `a priori' of the E-field's distributed singularity along the contour of a general metallic wedge is a most important factor in obtaining fast convergence of the numerical solution. We formulate rigorously this singularity, studying Laplace's equation in conical co-ordinates.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134466105","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
Waveguide Light Magnetostatic Waves Interaction in a Ferrite Film in Inhomogeneous Magnetic Fields 非均匀磁场下铁氧体薄膜中的波导光-静磁波相互作用
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336103
Y. Fetisov, A. A. Klimov, V. Preobrazhensky
{"title":"Waveguide Light Magnetostatic Waves Interaction in a Ferrite Film in Inhomogeneous Magnetic Fields","authors":"Y. Fetisov, A. A. Klimov, V. Preobrazhensky","doi":"10.1109/EUMA.1990.336103","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336103","url":null,"abstract":"Light scattering on magnetostatic waves (MSW) in yttrium-iron garnet(YIG) films in inhomogeneous magnetic fields was studied experimentally. Both collinear and orthogonal configurations of light interactions with surface (MSSW) and backward volume (MSBVW) waves in longitudinal and transverse inhomogeneous magnetic fields were considered. The advantages of inhomogeneous magnetizing fields application in magnetooptic microwave deflectors and spectrum analyzers are discussed.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132445538","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: 0
Active Microwave Noise Spectroscopy for Characterization of Superconducting Materiais 超导材料的有源微波噪声光谱表征
1990 20th European Microwave Conference Pub Date : 1990-10-01 DOI: 10.1109/EUMA.1990.336143
J. Konopka, G. Jung
{"title":"Active Microwave Noise Spectroscopy for Characterization of Superconducting Materiais","authors":"J. Konopka, G. Jung","doi":"10.1109/EUMA.1990.336143","DOIUrl":"https://doi.org/10.1109/EUMA.1990.336143","url":null,"abstract":"Most superconducting materials under dc current bias emanate excess noise which may extend from low frequencies up to the Tera-Hertz region. The microwave noise in some granular high Tc films at 12 GHz can be as high as 10 pW in 100 MHz bandwidth [1]. We studied these noises in Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O films grown on different subsrates in the temperature range from 4.2 to 100 K using current bias and magnetic field as experimental variables. Analysis of the measurements provides valuable information on the superconductor crystalline microstructure, parameters of the intrinsic Josephson clusters, synchronization of the radiation from clusters and on the properties of the intergranular inclusions. Some of these information is difficult or even impossible to obtain by other methods.","PeriodicalId":248044,"journal":{"name":"1990 20th European Microwave Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131661328","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
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