Pub Date : 1981-06-15DOI: 10.1109/MWSYM.1981.1129963
I. Bahl, S. Stuchly, J. Lagendijk, M. Stuchly
Two new microstrip radiators for inducing local hyperthermia designed to operate at 433 MHz and 915 MHz are described. Empirical design methods and experimental results obtained with phantoms are presented. The radiators have a desired uniform radiation pattern and are well matched to the muscle tissue or a water bolus.
{"title":"Microstrip Loop Radiators for Local Hyperthermia","authors":"I. Bahl, S. Stuchly, J. Lagendijk, M. Stuchly","doi":"10.1109/MWSYM.1981.1129963","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129963","url":null,"abstract":"Two new microstrip radiators for inducing local hyperthermia designed to operate at 433 MHz and 915 MHz are described. Empirical design methods and experimental results obtained with phantoms are presented. The radiators have a desired uniform radiation pattern and are well matched to the muscle tissue or a water bolus.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116347055","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129831
H.B. Jacard, G. G. Gomez
The dielectric constant and loss tangent values of several mixtures of sand, water and salt are measured at 9.3 GHz, in order to investigate the feasibility of microwave modelling of H.F. antennas which operate over imperfectly conducting ground. A particular mixture is used for modelling a monopole antenna over a circular metal disk which is lying on a lossy half-space. Good agreement between theoretical and experimental results is obtained for both input impedance and radiation pattern as a function of the radius of the ground system.
{"title":"Microwave Modelling of H. F. Antennas Over Lossy Earth","authors":"H.B. Jacard, G. G. Gomez","doi":"10.1109/MWSYM.1981.1129831","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129831","url":null,"abstract":"The dielectric constant and loss tangent values of several mixtures of sand, water and salt are measured at 9.3 GHz, in order to investigate the feasibility of microwave modelling of H.F. antennas which operate over imperfectly conducting ground. A particular mixture is used for modelling a monopole antenna over a circular metal disk which is lying on a lossy half-space. Good agreement between theoretical and experimental results is obtained for both input impedance and radiation pattern as a function of the radius of the ground system.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129894411","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129952
Y. Gazit, H. C. Johnson
A Ku-band microstrip phase shifter capable of continuous phase and amplitude control is described. Three dual-gate FET amplifiers provide variable amplitude vectors that are separated by 120/spl deg/ and summed through an arrangement of quadrature couplers. The described phase shifter provides a full 360/spl deg/ shift with an amplitude weighting capability of more than 20 dB.
{"title":"A Continuously Variable Ku-Band Phase/amplitude Control Module","authors":"Y. Gazit, H. C. Johnson","doi":"10.1109/MWSYM.1981.1129952","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129952","url":null,"abstract":"A Ku-band microstrip phase shifter capable of continuous phase and amplitude control is described. Three dual-gate FET amplifiers provide variable amplitude vectors that are separated by 120/spl deg/ and summed through an arrangement of quadrature couplers. The described phase shifter provides a full 360/spl deg/ shift with an amplitude weighting capability of more than 20 dB.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132413497","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129978
G.R. Simpson
An extension of the common two-port cascade connection to a generalized n-port cascade connection is described. An efficient matrix algorithm is then derived which computes the S-parameters of the resulting network from the S-parameters of the two connected networks.
{"title":"A Generalized n-Port Cascade Connection","authors":"G.R. Simpson","doi":"10.1109/MWSYM.1981.1129978","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129978","url":null,"abstract":"An extension of the common two-port cascade connection to a generalized n-port cascade connection is described. An efficient matrix algorithm is then derived which computes the S-parameters of the resulting network from the S-parameters of the two connected networks.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130917399","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129825
P. Rozenfeld, L. Mello, A. Filho
The finite-difference method is a numerical technique which accuracy strongly depends on the precision of the reconstruction of the boundary of a waveguide. Usually the figure is reconstructed either by an outside or an inside approximation, or by using a much more complex method of unequal-arm finite-difference operator. This paper describes a computer program which maintains the simplicity of the usual finite-difference method and which uses the best-fit approximation to the cross-section of a waveguide. As a result a better precision is obtained and smaller computer time is used in the solution of the dominant mode of the hollow homogeneous waveguide problem. Computed values of the cutoff frequencies for several waveguides are presented.
{"title":"Finite-Difference Method for the Arbitrary Cross-Section Waveguide Problem Using the Best-Fit Boundary Approximation","authors":"P. Rozenfeld, L. Mello, A. Filho","doi":"10.1109/MWSYM.1981.1129825","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129825","url":null,"abstract":"The finite-difference method is a numerical technique which accuracy strongly depends on the precision of the reconstruction of the boundary of a waveguide. Usually the figure is reconstructed either by an outside or an inside approximation, or by using a much more complex method of unequal-arm finite-difference operator. This paper describes a computer program which maintains the simplicity of the usual finite-difference method and which uses the best-fit approximation to the cross-section of a waveguide. As a result a better precision is obtained and smaller computer time is used in the solution of the dominant mode of the hollow homogeneous waveguide problem. Computed values of the cutoff frequencies for several waveguides are presented.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"313 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122495589","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129806
T. Trinh, R. Mittra, R. J. Paleta
A novel approach for designing a frequency-scanning millimeter-wave antenna is described. The antenna is constructed by using an image wide leaky-wave antenna embedded in a long trough with metal flares along both sides. The optimum flare angle for achieving maximum gain is theoretically predicted. The design of the leaky-wave antenna, which is comprised of metallic-strip perturbations on top of a dielectric guide, is also discussed.
{"title":"Horn Image Guide Leaky-Wave Antenna","authors":"T. Trinh, R. Mittra, R. J. Paleta","doi":"10.1109/MWSYM.1981.1129806","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129806","url":null,"abstract":"A novel approach for designing a frequency-scanning millimeter-wave antenna is described. The antenna is constructed by using an image wide leaky-wave antenna embedded in a long trough with metal flares along both sides. The optimum flare angle for achieving maximum gain is theoretically predicted. The design of the leaky-wave antenna, which is comprised of metallic-strip perturbations on top of a dielectric guide, is also discussed.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121270874","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129810
S. Nelson, H. Macksey
A GaAs FET amplifier using a 600 mu m gate width device has achieved ~ 300 mW output with 20-25% power-added efficiency across 2 to 18 GHz. With a 1350 mu m FET, 0.5 W output power was obtained from 7 to 16.5 GHz. Extending its large-signal performance to 2 GHz appears feasible.
{"title":"2-18 GHz, High-Efficiency, Medium-Power GaAs FET Amplifiers","authors":"S. Nelson, H. Macksey","doi":"10.1109/MWSYM.1981.1129810","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129810","url":null,"abstract":"A GaAs FET amplifier using a 600 mu m gate width device has achieved ~ 300 mW output with 20-25% power-added efficiency across 2 to 18 GHz. With a 1350 mu m FET, 0.5 W output power was obtained from 7 to 16.5 GHz. Extending its large-signal performance to 2 GHz appears feasible.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115364567","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129844
V. Sokolov, R. Bennett
Recent results are presented in the development of multi-stage GaAs FET power amplifiers operating in the 12 to 16 GHz frequency band. Microstrip circuit level power combining is used to achieve 4.5 W output power with 26 dB gain at 13.3 GHz with an efficiency of 15.8%, and a 1 dB bandwidth of 1.7 GHz.
{"title":"A 4.5 W, 26 dB Gain FET Power Amplifier at Ku-Band","authors":"V. Sokolov, R. Bennett","doi":"10.1109/MWSYM.1981.1129844","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129844","url":null,"abstract":"Recent results are presented in the development of multi-stage GaAs FET power amplifiers operating in the 12 to 16 GHz frequency band. Microstrip circuit level power combining is used to achieve 4.5 W output power with 26 dB gain at 13.3 GHz with an efficiency of 15.8%, and a 1 dB bandwidth of 1.7 GHz.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"480 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123004028","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129905
D. Kajfez, S. Bokka, C.E. Smith
A design procedure is described for dc blocks using asymmetric coupled microstrip which exhibit a rippled frequency response, while at the same time acting as impedance transformers. Lumped capacitances are added in order to compensate for the difference in propagation constants of two quasi TEM modes.
{"title":"Asymmetric Microstrip DC Blocks with Rippled Response","authors":"D. Kajfez, S. Bokka, C.E. Smith","doi":"10.1109/MWSYM.1981.1129905","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129905","url":null,"abstract":"A design procedure is described for dc blocks using asymmetric coupled microstrip which exhibit a rippled frequency response, while at the same time acting as impedance transformers. Lumped capacitances are added in order to compensate for the difference in propagation constants of two quasi TEM modes.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130229274","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 : 1981-06-15DOI: 10.1109/MWSYM.1981.1129837
W. Hoefer
The equivalent circuit parameters of inductive strips and of impedance steps in unilateral fin line are presented. They have been obtained from the measured resonant frequencies of a rectangular cavity containing these circuit elements.
{"title":"Experimental Characterization of Fin Line Discontinuities Using Resonant Techniques","authors":"W. Hoefer","doi":"10.1109/MWSYM.1981.1129837","DOIUrl":"https://doi.org/10.1109/MWSYM.1981.1129837","url":null,"abstract":"The equivalent circuit parameters of inductive strips and of impedance steps in unilateral fin line are presented. They have been obtained from the measured resonant frequencies of a rectangular cavity containing these circuit elements.","PeriodicalId":120372,"journal":{"name":"1981 IEEE MTT-S International Microwave Symposium Digest","volume":"1998 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123788214","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：