Pub Date : 1985-06-04DOI: 10.1109/MWSYM.1985.1132041
Y. Shih, L. Bui, T. Ltoh
A novel design of W-band (75-110 GHz) non-contiguous diplexers is described. The common port of the diplexer is fed by suspended probe transitions which are suitable for wide-band applications. The circuit is printed on a single substrate and easily assembled in a split-block housing. The insertion loss at the passbands is about 1 dB.
{"title":"Millimeter-Wave Diplexers with Printed Circuit Elements","authors":"Y. Shih, L. Bui, T. Ltoh","doi":"10.1109/MWSYM.1985.1132041","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132041","url":null,"abstract":"A novel design of W-band (75-110 GHz) non-contiguous diplexers is described. The common port of the diplexer is fed by suspended probe transitions which are suitable for wide-band applications. The circuit is printed on a single substrate and easily assembled in a split-block housing. The insertion loss at the passbands is about 1 dB.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134256958","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1132051
D. Boire, J. Degenford, H. Cohn
This paper describes a wideband phase shifter suitable for hybrid and monolithic phased array modules. The phase shifter employs a 180° digital bit and one or two analog sections to obtain a full 360° phase shift range. The design of the phase shifter and experimental results are presented.
{"title":"A 4.5 to 18 GHz Phase Shifter","authors":"D. Boire, J. Degenford, H. Cohn","doi":"10.1109/MWSYM.1985.1132051","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132051","url":null,"abstract":"This paper describes a wideband phase shifter suitable for hybrid and monolithic phased array modules. The phase shifter employs a 180° digital bit and one or two analog sections to obtain a full 360° phase shift range. The design of the phase shifter and experimental results are presented.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134293868","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1131905
T. Felderman, J. Shaeffer, A.M. El-Mahdj, K. Carr, J. Stecker
Varicocele, a varicose enlargement of the veins in the spermatic cord, is found in 21-39% of men being evaluated for infertility. Thermometric detection of this condition was attempted by microwave radiometry as well as by contact thermometry using thermistor probes. The inguinal and scrotal regions of 44 male subjects and inguinal regions of 11 female subjects were studied. Substantially different thermal patterns were obtained by thermistors (surface temperature) and microwave radiometry (subsurface temperature). There was a correlation between left scrotal varicocele and a temperature elevation of the left spermatic cord using microwave radiometry. This thermal defect appeared to be corrected following surgery.
{"title":"Microwave Radiometric Detection of Thermal Asymmetry of Varicocele","authors":"T. Felderman, J. Shaeffer, A.M. El-Mahdj, K. Carr, J. Stecker","doi":"10.1109/MWSYM.1985.1131905","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131905","url":null,"abstract":"Varicocele, a varicose enlargement of the veins in the spermatic cord, is found in 21-39% of men being evaluated for infertility. Thermometric detection of this condition was attempted by microwave radiometry as well as by contact thermometry using thermistor probes. The inguinal and scrotal regions of 44 male subjects and inguinal regions of 11 female subjects were studied. Substantially different thermal patterns were obtained by thermistors (surface temperature) and microwave radiometry (subsurface temperature). There was a correlation between left scrotal varicocele and a temperature elevation of the left spermatic cord using microwave radiometry. This thermal defect appeared to be corrected following surgery.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132536651","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1132074
G. Kalivas, R. Harrison
A novel frequency-halving structure employs a matched pair of varactors in a configuration composed of both slotline and microstrip transmission-line sections. A planar 4th-order Marchand balun simultaneously provides both output matching and a balance-to-unbalance transition.
{"title":"A New Slotline-Microstrip Frequency Halver","authors":"G. Kalivas, R. Harrison","doi":"10.1109/MWSYM.1985.1132074","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132074","url":null,"abstract":"A novel frequency-halving structure employs a matched pair of varactors in a configuration composed of both slotline and microstrip transmission-line sections. A planar 4th-order Marchand balun simultaneously provides both output matching and a balance-to-unbalance transition.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132296395","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1132062
K. Stephan, G. Perks
Noise-figure measurements of an X-band slot-ring mixer using quasi-optical coupling of LO and RF energy are described. The mixer noise figure varies from 5.5 to 9 dB over the IF band, and extension of this design to millimeter wavelengths should be straight-forward.
{"title":"Quasi-Optical Slot Ring Mixer Noise Figure Measurements","authors":"K. Stephan, G. Perks","doi":"10.1109/MWSYM.1985.1132062","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132062","url":null,"abstract":"Noise-figure measurements of an X-band slot-ring mixer using quasi-optical coupling of LO and RF energy are described. The mixer noise figure varies from 5.5 to 9 dB over the IF band, and extension of this design to millimeter wavelengths should be straight-forward.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115836334","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1131915
L. Yuan, P. Asher
A fully monolithic balanced mixer fabricated on a GaAs substrate for operation at W-Band (75 to 110 GHz) is described. The overall size of the mixer chip is 0.075"x 0.075"x0.004". A minimum conversion loss of 4.6 dB has been measured at 91.1 GHz for narrow band operation. For broadband operation, a conversion loss of less than 8 dB has been achieved over an RF range of 73.6 to 83.6 GHz with a corresponding IF range of 8 to 18 GHz.
{"title":"A W-Band Monolithic Balanced Mixer","authors":"L. Yuan, P. Asher","doi":"10.1109/MWSYM.1985.1131915","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131915","url":null,"abstract":"A fully monolithic balanced mixer fabricated on a GaAs substrate for operation at W-Band (75 to 110 GHz) is described. The overall size of the mixer chip is 0.075\"x 0.075\"x0.004\". A minimum conversion loss of 4.6 dB has been measured at 91.1 GHz for narrow band operation. For broadband operation, a conversion loss of less than 8 dB has been achieved over an RF range of 73.6 to 83.6 GHz with a corresponding IF range of 8 to 18 GHz.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124098293","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1131922
A. Beyer, D. Kother, I. Wolff
Among other components directional couplers are employed in millimeterwave finline circuits. The method presented here allows a simple calculation of all modes which can exist on such couplers under consideration of the thickness of the metallization. In this way a 3-dB coupler has been developed for the Ka-band. Numerical and experimental results illustrate the applicability of this method.
{"title":"Development of a Coupler in Finline Technique","authors":"A. Beyer, D. Kother, I. Wolff","doi":"10.1109/MWSYM.1985.1131922","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131922","url":null,"abstract":"Among other components directional couplers are employed in millimeterwave finline circuits. The method presented here allows a simple calculation of all modes which can exist on such couplers under consideration of the thickness of the metallization. In this way a 3-dB coupler has been developed for the Ka-band. Numerical and experimental results illustrate the applicability of this method.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124078444","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1132037
M. Shelley, J. Berenz, A. Nichols, K. Nakano, R. Sawires, J. Abell
This paper describes the design and development of a multistage low noise High Electron Mobility Transistor (HEMT) amplifier that exhibits state-of-the-art performance over the frequency range of 36-40 GHz. The amplifier utilizes a series of three single ended stages that are each designed around TRW's HEMT device. Typical performance to date has been 15-17 dB gain with an associated noise figure of 4.0 to 4.6 dB.
{"title":"36.0 - 40.0 GHz HEMT Low Noise Amplifier","authors":"M. Shelley, J. Berenz, A. Nichols, K. Nakano, R. Sawires, J. Abell","doi":"10.1109/MWSYM.1985.1132037","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132037","url":null,"abstract":"This paper describes the design and development of a multistage low noise High Electron Mobility Transistor (HEMT) amplifier that exhibits state-of-the-art performance over the frequency range of 36-40 GHz. The amplifier utilizes a series of three single ended stages that are each designed around TRW's HEMT device. Typical performance to date has been 15-17 dB gain with an associated noise figure of 4.0 to 4.6 dB.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"333 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122849450","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1131976
E. Crescenzi, R. Besser, B. A. Tucker, T. R. Kritzer
A 2-6 GHz microwave limiting amplifier has been constructed using alternating MMIC limiters and GaAs FET amplifier stages. The function of the limiters is to restrict signal levels such that the gain stages operate in a linear region. A multistage prototype amplifier maintained second harmonic levels at least 28 dB below the fundamental output, when driven 30 dB into saturation.
{"title":"Wide-Band Limiting Amplifiers with Low Second Harmonic Distortion, Utilizing GaAs MMIC Limiters","authors":"E. Crescenzi, R. Besser, B. A. Tucker, T. R. Kritzer","doi":"10.1109/MWSYM.1985.1131976","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131976","url":null,"abstract":"A 2-6 GHz microwave limiting amplifier has been constructed using alternating MMIC limiters and GaAs FET amplifier stages. The function of the limiters is to restrict signal levels such that the gain stages operate in a linear region. A multistage prototype amplifier maintained second harmonic levels at least 28 dB below the fundamental output, when driven 30 dB into saturation.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"5 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122979765","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 : 1985-06-04DOI: 10.1109/MWSYM.1985.1131996
W. Curtice, M. Ettenberg
A nonlinear equivalent circuit model for the GaAs FET has been developed based upon the small-signal device model and separate current measurements, including drain-gate avalanche current data. The harmonic balance technique is used to develop the FET rf load-pull characteristics in an amplifier configuration under large signal operation. Computed and experimental load-pull results show good agreement.
{"title":"A Nonlinear GaAs FET Model for Use in the Design of Output Circuits for Power Amplifiers","authors":"W. Curtice, M. Ettenberg","doi":"10.1109/MWSYM.1985.1131996","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131996","url":null,"abstract":"A nonlinear equivalent circuit model for the GaAs FET has been developed based upon the small-signal device model and separate current measurements, including drain-gate avalanche current data. The harmonic balance technique is used to develop the FET rf load-pull characteristics in an amplifier configuration under large signal operation. Computed and experimental load-pull results show good agreement.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123118369","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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