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1992 IEEE Microwave Symposium Digest MTT-S最新文献

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Optimized 0.1 mu m GaAs MESFET's 优化了0.1 μ m GaAs MESFET
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188065
K. Moore, J. East, G. Haddad, T. Brock
{"title":"Optimized 0.1 mu m GaAs MESFET's","authors":"K. Moore, J. East, G. Haddad, T. Brock","doi":"10.1109/MWSYM.1992.188065","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188065","url":null,"abstract":"The authors have optimized the design of conventional GaAs MESFETs for high-frequency operation. FETs were fabricated using electron beam lithography to define 0.1- mu m mushroom and T gates. The best results obtained included peak transconductance of 600 mS/mm, f/sub t/=93 GHz, and f/sub max/>or=150 GHz. In addition, studies were carried out to examine the effect of gate shape and location on high-frequency device performance.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"60 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114024208","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
Removing package effects from microstrip moment method calculations 从微带矩法计算中去除包效应
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188220
R. Jackson
{"title":"Removing package effects from microstrip moment method calculations","authors":"R. Jackson","doi":"10.1109/MWSYM.1992.188220","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188220","url":null,"abstract":"The electromagnetic behavior of microstrip circuits often depends on the package that surrounds the circuit. This is especially true if the package is electrically large. The importance of a damped enclosure for modeling and operating MMIC (monolithic microwave IC) circuits is discussed, a method of damping enclosures is presented, and an efficient technique for applying the method of moments so as to determine the significance of the package effects on full-wave simulations is outlined.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127653876","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: 8
Planar X-band SQUID-gradiometer design for HTS applications 用于高温超导应用的平面x波段squid梯度计设计
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188016
B. Mayer, R. Knochel, T. Bade, M. Schilling, B. David
{"title":"Planar X-band SQUID-gradiometer design for HTS applications","authors":"B. Mayer, R. Knochel, T. Bade, M. Schilling, B. David","doi":"10.1109/MWSYM.1992.188016","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188016","url":null,"abstract":"An RF-SQUID (superconducting quantum interference device) gradiometer integrated in a lambda /2 length microstrip resonator is described. The device was realized with low-temperature superconductors (LTS) using a shunted NbN/MgO/NbN SIS (superconductor-insulator-superconductor) junction as the active element. Various measurement results are given. Measurements of the complex reflection coefficient clearly show a periodic dependence on an applied DC flux. Due to the fully planar design, the SQUID is an appropriate basic element of a one-chip magnetometer including flux transformer. Work is under way to realize the circuit in high-temperature superconductors.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132683492","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
Oscillator and amplifier grids 振荡器和放大器栅格
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188112
D. Rutledge, J. Hacker, M. Kim, R. Weikle, R.P. Smith, E. Sovero
{"title":"Oscillator and amplifier grids","authors":"D. Rutledge, J. Hacker, M. Kim, R. Weikle, R.P. Smith, E. Sovero","doi":"10.1109/MWSYM.1992.188112","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188112","url":null,"abstract":"Presents the largest recorded output power for a quasi-optical power-combining array and a new planar heterojunction bipolar transistor (HBT) grid amplifier design. A 16-element MESFET grid oscillator has been fabricated that generated an effective radiated power of 28 W at 9.21 GHz. The total radiated power was estimated to be 2.0 W, giving a DC to RF efficiency of 28%. A new planar grid amplifier is also presented that is suitable for monolithic fabrication. The planar amplifier grid is a hybrid design using HBT transistors monolithically fabricated in a differential pair configuration and wire bonded to a Duroid substrate. The grid amplifier had a measured gain of 11 dB at 9.9 GHz.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133413901","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: 12
Microwave noise figure in MESFETs and HEMTs with kink-effect and (or) parallel conduction 具有扭结效应和(或)并联传导的mesfet和hemt中的微波噪声系数
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.187969
J. Reynoso‐Hernández, L. Escotte, R. Plana, J. Graffeuil
{"title":"Microwave noise figure in MESFETs and HEMTs with kink-effect and (or) parallel conduction","authors":"J. Reynoso‐Hernández, L. Escotte, R. Plana, J. Graffeuil","doi":"10.1109/MWSYM.1992.187969","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.187969","url":null,"abstract":"The authors consider the influence of the kink effect often noticed in MESFETs and HEMTs (high electron mobility transistors) and the parallel conduction sometimes observed in HEMTs on the microwave noise figure. It is found that the kink effect mostly affects MESFET noise and that parallel conduction affects HEMT noise, especially when operated at large drain current. Consequences for optimal bias conditions for low noise amplifiers are outlined.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133514150","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
Leakage of the stripline dominant mode produced by a small air gap 泄漏的带状线主导模式产生了一个小的气隙
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188021
D. Nghiem, J.T. Williams, D. Jackson, A. Oliner
{"title":"Leakage of the stripline dominant mode produced by a small air gap","authors":"D. Nghiem, J.T. Williams, D. Jackson, A. Oliner","doi":"10.1109/MWSYM.1992.188021","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188021","url":null,"abstract":"It is demonstrated that a dominant complex improper (leaky) mode exists in general on a conventional stripline with a small air gap above the strip. This improper mode has a zero cutoff frequency, as does the proper mode. The improper (leaky) mode, rather than the proper mode, is the one that has fields resembling those of the conventional TEM (transverse electromagnetic) homogeneous stripline mode, and is therefore the mode that is expected to be more strongly excited by a common stripline feed. Its presence may cause spurious transmission-line effects along such stripline, because it leaks power and may therefore interact with other circuit components, as well as interfere directly with the fields of the proper mode. This spurious behavior has been demonstrated experimentally.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133645379","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
Electromagnetic simulation of microstrip structures with symmetrically coupled microstrip ports 具有对称耦合微带端口的微带结构的电磁仿真
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.187996
J. Zheng, P. Draxler
{"title":"Electromagnetic simulation of microstrip structures with symmetrically coupled microstrip ports","authors":"J. Zheng, P. Draxler","doi":"10.1109/MWSYM.1992.187996","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.187996","url":null,"abstract":"An electromagnetic simulation, based on a triangular grid and a rectangular grid, is applied to the analysis of coupled microstrip structures, and a standing wave detection algorithm is developed for the S-parameter extraction of symmetrically coupled microstrip lines. The process extracts the ratios of the reflected waves over the incident waves and the propagation constants of the two modes (even and odd) from the numerically solved electric current standing wave distributions. The authors present a full-wave analysis of coupled microstrip structures and a de-embedding technique that solves for the propagation constants and S-parameters based on the guided wave modes of the feed structures. The technique can also be guided to other symmetrically coupled structures.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131794428","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
CARABAS-an UWB low frequency SAR 超宽带低频SAR
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188295
H. Hellsten
{"title":"CARABAS-an UWB low frequency SAR","authors":"H. Hellsten","doi":"10.1109/MWSYM.1992.188295","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188295","url":null,"abstract":"The significance of low-frequency ultrawideband (UWB) radar imagery has been investigated. In order to verify the theoretical predictions, an airborne SAR (synthetic aperture radar) system, operating over the frequency band 20-90 MHz, has been developed. CARABAS (coherent all radio band sensing) adopts a major part of the shortwave radio band for the transmission and reception of UWB signals. As a result, the system has a high geometric resolution, in particular in relation to the emitted wavelengths. A first data collection campaign took place in January 1992; initial data are still in the phase of evaluation. In the wavelength interval adopted, vegetation is transparent and radiation penetrates the ground to a significant degree. The system is considered capable of mapping structures and objects obscured by vegetation or buried in the ground.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134331218","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
Analysis of overmoded waveguides using the finite-difference time domain method 时域有限差分法分析过模波导
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.187997
D. Roper, J. Baird
{"title":"Analysis of overmoded waveguides using the finite-difference time domain method","authors":"D. Roper, J. Baird","doi":"10.1109/MWSYM.1992.187997","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.187997","url":null,"abstract":"Presents techniques developed for analyzing scattering and coupling in overmoded waveguides using the finite-difference time-domain (FDTD) method. Sources and adsorbing boundary conditions for waveguide modes are examined. The stair-step approximation to round surfaces is considered, and a technique for finding the effective radius of a cylindrical model is described. A numerical example of scattering from a step diameter transition in circular waveguides is presented and compared to the analytic solution.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133046460","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
Analysis of radiating planar resonators with the method of lines 辐射型平面谐振器的线法分析
1992 IEEE Microwave Symposium Digest MTT-S Pub Date : 1992-06-01 DOI: 10.1109/MWSYM.1992.188003
A. Dreher, R. Pregla
{"title":"Analysis of radiating planar resonators with the method of lines","authors":"A. Dreher, R. Pregla","doi":"10.1109/MWSYM.1992.188003","DOIUrl":"https://doi.org/10.1109/MWSYM.1992.188003","url":null,"abstract":"The method of lines (MOL) is extended to analyze radiating planar resonators by the use of absorbing boundary conditions. The complex frequency of a microstrip patch is computed and compared to results achieved by the integral equation method.<<ETX>>","PeriodicalId":165665,"journal":{"name":"1992 IEEE Microwave Symposium Digest MTT-S","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115338010","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: 10
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