Pub Date : 1995-05-17DOI: 10.1109/NTCMWS.1995.522886
S. Chew, D. Tong, M. Wu, T. Itoh
An active antenna array system, capable of switching between sum and difference patterns for radar applications, is explored. The desired phase relationship amongst antenna elements is synthesized via injection locking. Optical reference signal is transmitted from remote controller through optical fiber link. Measured patterns agree with theoretical results.<>
{"title":"Active antenna array with optical interaction for application in radar system","authors":"S. Chew, D. Tong, M. Wu, T. Itoh","doi":"10.1109/NTCMWS.1995.522886","DOIUrl":"https://doi.org/10.1109/NTCMWS.1995.522886","url":null,"abstract":"An active antenna array system, capable of switching between sum and difference patterns for radar applications, is explored. The desired phase relationship amongst antenna elements is synthesized via injection locking. Optical reference signal is transmitted from remote controller through optical fiber link. Measured patterns agree with theoretical results.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122837769","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.405928
P. Winson, L. Dunleavy, H. Gordon, M. Calvo, J. Sherman
In this paper we present a novel algorithm for a flexible table-based, bias-dependent, small-signal cascode MESFET model. The model utilizes 2-port DC and RF characterizations of a single-gate, common-source MESFET in contrast to the typical 3-port characterization approach typically applied to dual-gate and cascode FETs. Cascode FET simulations enabled by the new model are shown to track measured data over varying bias conditions.<>
{"title":"A novel algorithm for bias-dependent cascode FET modeling","authors":"P. Winson, L. Dunleavy, H. Gordon, M. Calvo, J. Sherman","doi":"10.1109/MWSYM.1995.405928","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.405928","url":null,"abstract":"In this paper we present a novel algorithm for a flexible table-based, bias-dependent, small-signal cascode MESFET model. The model utilizes 2-port DC and RF characterizations of a single-gate, common-source MESFET in contrast to the typical 3-port characterization approach typically applied to dual-gate and cascode FETs. Cascode FET simulations enabled by the new model are shown to track measured data over varying bias conditions.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117235219","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.405913
T. Ishikawa, E. Yamashita
This paper describes the extremely low crosstalk characteristics of a guided wave structure, buried microstrip line. The analyses with the use of the rectangular boundary division method and FDTD method have revealed that the line structure possesses much lower coupling coefficients than traditional microstrip lines, from -15 dB to -100 dB depending on their burial depth. This line structure is believed to be quite useful for realizing highly integrated microwave and millimeter-wave circuits.<>
{"title":"Low crosstalk characteristics of buried microstrip lines","authors":"T. Ishikawa, E. Yamashita","doi":"10.1109/MWSYM.1995.405913","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.405913","url":null,"abstract":"This paper describes the extremely low crosstalk characteristics of a guided wave structure, buried microstrip line. The analyses with the use of the rectangular boundary division method and FDTD method have revealed that the line structure possesses much lower coupling coefficients than traditional microstrip lines, from -15 dB to -100 dB depending on their burial depth. This line structure is believed to be quite useful for realizing highly integrated microwave and millimeter-wave circuits.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"39 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120850301","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.406099
T. Seniuk, Q.Z. Liu, G. Cormack
A hybrid integrated three stage HEMT amplifier with a gain of 25 dB and a bandwidth of 5.4 GHz has been designed and constructed. When reconfigurated as an optical receiver by using a linear 1/spl times/8 array of GaAs metal-semiconductor-metal photodetectors as the input, 41 dB/spl Omega/ of transimpedance is achieved up to frequencies higher than 5 GHz.<>
{"title":"1/spl times/8 metal-semiconductor-metal photodetector and HEMT receiver array with 5 GHz bandwidth","authors":"T. Seniuk, Q.Z. Liu, G. Cormack","doi":"10.1109/MWSYM.1995.406099","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.406099","url":null,"abstract":"A hybrid integrated three stage HEMT amplifier with a gain of 25 dB and a bandwidth of 5.4 GHz has been designed and constructed. When reconfigurated as an optical receiver by using a linear 1/spl times/8 array of GaAs metal-semiconductor-metal photodetectors as the input, 41 dB/spl Omega/ of transimpedance is achieved up to frequencies higher than 5 GHz.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124836753","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.405933
J. Schoenberg, T. Mader, B. Shaw, Z. Popovic
Several quasi-optical transmission wave amplifiers are presented: (1) a two-level power-combining PHEMT patch-antenna lens amplifier with 8 dB of absolute power gain at 9.7 GHz used for beamforming and beam-switching; (2) a saturated class-A polarization-preserving 24-MESFET patch array which produces 0.7 Watts at 10 GHz with 21% power-added efficiency; and (3) an X-band 2-stage low-noise CPW PHEMT amplifier cell using anti-resonant slot antennas with 21.7 dB active gain, 3.2 dB noise figure and a 6% 3 dB bandwidth.<>
{"title":"Quasi-optical antenna array amplifiers","authors":"J. Schoenberg, T. Mader, B. Shaw, Z. Popovic","doi":"10.1109/MWSYM.1995.405933","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.405933","url":null,"abstract":"Several quasi-optical transmission wave amplifiers are presented: (1) a two-level power-combining PHEMT patch-antenna lens amplifier with 8 dB of absolute power gain at 9.7 GHz used for beamforming and beam-switching; (2) a saturated class-A polarization-preserving 24-MESFET patch array which produces 0.7 Watts at 10 GHz with 21% power-added efficiency; and (3) an X-band 2-stage low-noise CPW PHEMT amplifier cell using anti-resonant slot antennas with 21.7 dB active gain, 3.2 dB noise figure and a 6% 3 dB bandwidth.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125573125","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.405983
Jifu Huang, K. Wu, P. Morin, C. Akyel
In this paper, a new transmission line matrix node is proposed for electromagnetic analysis of a composite coaxial cell which is used to characterize highly dispersive materials over a large frequency band. A variety of measurements using such a coaxial line cell have been done with different liquid samples to verify the wideband characteristics. It is shown that theoretical and experimental results have a very good agreement.<>
{"title":"Electromagnetic analysis of composite coaxial cells for wideband measurements of highly dispersive materials","authors":"Jifu Huang, K. Wu, P. Morin, C. Akyel","doi":"10.1109/MWSYM.1995.405983","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.405983","url":null,"abstract":"In this paper, a new transmission line matrix node is proposed for electromagnetic analysis of a composite coaxial cell which is used to characterize highly dispersive materials over a large frequency band. A variety of measurements using such a coaxial line cell have been done with different liquid samples to verify the wideband characteristics. It is shown that theoretical and experimental results have a very good agreement.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126764972","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.405895
J. Bautista, M. Hamai, M. Nishimoto, J. Laskar, P. Szydlik, R. Lai
Significant advances in the development of HEMT technology have resulted in high performance cryogenic LNAs whose noise temperatures are within an order of magnitude of the quantum noise limit (hn/k). Key to the identification of optimum HEMT structures at cryogenic temperatures is the development of on-wafer noise and device parameter extraction techniques.<>
{"title":"Ultra-low noise HEMT device models: application of on-wafer cryogenic noise analysis and improved parameter extraction techniques","authors":"J. Bautista, M. Hamai, M. Nishimoto, J. Laskar, P. Szydlik, R. Lai","doi":"10.1109/MWSYM.1995.405895","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.405895","url":null,"abstract":"Significant advances in the development of HEMT technology have resulted in high performance cryogenic LNAs whose noise temperatures are within an order of magnitude of the quantum noise limit (hn/k). Key to the identification of optimum HEMT structures at cryogenic temperatures is the development of on-wafer noise and device parameter extraction techniques.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115518360","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.406053
M. Yu, A. Gopinath
The 3 dB bandwidth of 17 GHz has obtained for the directional coupler modulator with capacitive-loaded electrode structure, and is in good agreement with the 20 GHz predicted result. We believe that this is the highest bandwidth obtained in the directional coupler modulators.<>
{"title":"High-speed directional coupler modulator with velocity-matched electrode structure","authors":"M. Yu, A. Gopinath","doi":"10.1109/MWSYM.1995.406053","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.406053","url":null,"abstract":"The 3 dB bandwidth of 17 GHz has obtained for the directional coupler modulator with capacitive-loaded electrode structure, and is in good agreement with the 20 GHz predicted result. We believe that this is the highest bandwidth obtained in the directional coupler modulators.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116583654","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.405900
T. Nuteson, G. P. Monahan, R.B. Steer, K. Naishadham, J. Mink, F. Schwering
A moment method using a dyadic Green's function is developed for the analysis of quasi-optical systems. The dyadic Green's function used has separate terms for the paraxial and non-paraxial fields and is much easier to develop than a mixed potential Green's function. The method is applied to the analysis of antenna elements in a quasi-optical resonator.<>
{"title":"Use of the moment method and dyadic Green's functions in the analysis of quasi-optical structures","authors":"T. Nuteson, G. P. Monahan, R.B. Steer, K. Naishadham, J. Mink, F. Schwering","doi":"10.1109/MWSYM.1995.405900","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.405900","url":null,"abstract":"A moment method using a dyadic Green's function is developed for the analysis of quasi-optical systems. The dyadic Green's function used has separate terms for the paraxial and non-paraxial fields and is much easier to develop than a mixed potential Green's function. The method is applied to the analysis of antenna elements in a quasi-optical resonator.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122976641","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 : 1995-05-16DOI: 10.1109/MWSYM.1995.406247
J. Bandler, R. Biernacki, S. H. Chen, R. Hemmers, Kristoffer Hougaard Madsen
We propose a new aggressive Space Mapping strategy for electromagnetic (EM) optimization. Instead of waiting for upfront EM analyses at several base points, it exploits every available EM analysis using the classical Broyden update, producing dramatic results right from the first step. A high-temperature superconducting filter design solution emerges after fewer EM analyses than the number of designable parameters! For the first time, Space Mapping is extended to the parameter extraction phase, overcoming severely misaligned starting points induced by inadequate empirical models.<>
{"title":"Aggressive space mapping for electromagnetic design","authors":"J. Bandler, R. Biernacki, S. H. Chen, R. Hemmers, Kristoffer Hougaard Madsen","doi":"10.1109/MWSYM.1995.406247","DOIUrl":"https://doi.org/10.1109/MWSYM.1995.406247","url":null,"abstract":"We propose a new aggressive Space Mapping strategy for electromagnetic (EM) optimization. Instead of waiting for upfront EM analyses at several base points, it exploits every available EM analysis using the classical Broyden update, producing dramatic results right from the first step. A high-temperature superconducting filter design solution emerges after fewer EM analyses than the number of designable parameters! For the first time, Space Mapping is extended to the parameter extraction phase, overcoming severely misaligned starting points induced by inadequate empirical models.<<ETX>>","PeriodicalId":239581,"journal":{"name":"Proceedings of 1995 IEEE MTT-S International Microwave Symposium","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122162554","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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