Pub Date : 1985-06-04DOI: 10.1109/MWSYM.1985.1131932
P. Goldsmith
We review the propagation of Gaussian beams of radiation through asymmetric elements which focus in only one direction perpendicular to the axis of propagation: these are most commonly cylindrical lenses or mirrors. We develop formulas for Gaussian beam imaging with fixed total distance between input and output waists, and use them to derive simple expressions for the case where the input and output waists are located in the same plane. This situation is required for correcting the beam patterns of certain types of feedhorns to improve the symmetry of their radiation patterns, as well as for the illumination of asymmetric antennas. A cylindrical lens has been used to transform the symmetric beam of a 100 GHz scalar feedhorn into an elliptical pattern; the results are in good agreement with the imaging formulas and demonstrate the utility of this technique.
{"title":"Gaussian Beam Imaging with Cylindrical Optics","authors":"P. Goldsmith","doi":"10.1109/MWSYM.1985.1131932","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131932","url":null,"abstract":"We review the propagation of Gaussian beams of radiation through asymmetric elements which focus in only one direction perpendicular to the axis of propagation: these are most commonly cylindrical lenses or mirrors. We develop formulas for Gaussian beam imaging with fixed total distance between input and output waists, and use them to derive simple expressions for the case where the input and output waists are located in the same plane. This situation is required for correcting the beam patterns of certain types of feedhorns to improve the symmetry of their radiation patterns, as well as for the illumination of asymmetric antennas. A cylindrical lens has been used to transform the symmetric beam of a 100 GHz scalar feedhorn into an elliptical pattern; the results are in good agreement with the imaging formulas and demonstrate the utility of this technique.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"48 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":"125574199","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.1985.1131969
M. Ramadan
A theoretical and experimental investigation is made to determine the feasibility of transmitting analog video signal over fiber at 1.3 µm. Effects of LED current and optical modulation index on various parameters such as second and third order intetmodulation, and differential gain (DG) and differential phase (DP) were evaluated. Preemphasis effects on signal-to-noise ratio (S/N) and DG and DP were also presented. Experimental results were in close agreement with theory.
{"title":"Analog Signals Transmission Over Optical Fiber Systems","authors":"M. Ramadan","doi":"10.1109/MWSYM.1985.1131969","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131969","url":null,"abstract":"A theoretical and experimental investigation is made to determine the feasibility of transmitting analog video signal over fiber at 1.3 µm. Effects of LED current and optical modulation index on various parameters such as second and third order intetmodulation, and differential gain (DG) and differential phase (DP) were evaluated. Preemphasis effects on signal-to-noise ratio (S/N) and DG and DP were also presented. Experimental results were in close agreement with theory.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"46 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":"126159637","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.1985.1132069
E. Loser
An experimental 3-band varactor diode power upconverter for SSB-AM communications has been linearized by predistortion at IF. Several types of simple predistortion linearizes have been tested and compared. Linearization factors from 10 to 22 dB have been achieved within a frequency band of 40 MHz or a dynamic range of 10 to 20 dB.
{"title":"An Experimental Linearized Power Upconverter for SSB Signals","authors":"E. Loser","doi":"10.1109/MWSYM.1985.1132069","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132069","url":null,"abstract":"An experimental 3-band varactor diode power upconverter for SSB-AM communications has been linearized by predistortion at IF. Several types of simple predistortion linearizes have been tested and compared. Linearization factors from 10 to 22 dB have been achieved within a frequency band of 40 MHz or a dynamic range of 10 to 20 dB.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"26 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":"124471483","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.1985.1131921
A. Omar, K. Schunemann
The singular integral equation technique is used to determine the normal modes of propagation in general planar transmission lines. Taking fin-lines as example it is demonstrated, how high-order modes can effectively and accurately be calculated. Some of these modes show an unusual evanescent nature for certain combinations of parameters. The modes of this type exist always in pairs with their squared propagation constants being complex conjugate.
{"title":"Formulation of the Singular Integral Equation Technique for General Planar Transmission Lines","authors":"A. Omar, K. Schunemann","doi":"10.1109/MWSYM.1985.1131921","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131921","url":null,"abstract":"The singular integral equation technique is used to determine the normal modes of propagation in general planar transmission lines. Taking fin-lines as example it is demonstrated, how high-order modes can effectively and accurately be calculated. Some of these modes show an unusual evanescent nature for certain combinations of parameters. The modes of this type exist always in pairs with their squared propagation constants being complex conjugate.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"56 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":"123717399","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.1985.1131956
A. Riddle, R. Trew
A novel GaAs FET oscillator circuit is presented. This circuit is capable of reducing phase noise up to 20 db. A source-coupled pair of GaAs FETs has a balanced characteristic which can eliminate both the reactive and resistive modulation mechanisms which upconvert l/f noise. This circuit is inherently broadband and ideal for monolithic implementations.
{"title":"A Novel GaAs FET Oscillator with Low Phase Noise","authors":"A. Riddle, R. Trew","doi":"10.1109/MWSYM.1985.1131956","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131956","url":null,"abstract":"A novel GaAs FET oscillator circuit is presented. This circuit is capable of reducing phase noise up to 20 db. A source-coupled pair of GaAs FETs has a balanced characteristic which can eliminate both the reactive and resistive modulation mechanisms which upconvert l/f noise. This circuit is inherently broadband and ideal for monolithic implementations.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"9 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":"121486561","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.1985.1131937
T. M. Nelson, M. Kline
The purpose of this study is to provide a comparative evaluation of the quality of RF grounds used with microstrip circuitry on aluminum clad soft substrates. The data obtained by the study is documented and analyzed in the report with appropriate conclusions and recommendations provided.
{"title":"Investigation and Evaluation of Low Loss Interconnects on Soft Substrates Clad to Aluminum","authors":"T. M. Nelson, M. Kline","doi":"10.1109/MWSYM.1985.1131937","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131937","url":null,"abstract":"The purpose of this study is to provide a comparative evaluation of the quality of RF grounds used with microstrip circuitry on aluminum clad soft substrates. The data obtained by the study is documented and analyzed in the report with appropriate conclusions and recommendations provided.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"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":"130488823","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.1985.1132076
K. Kawamoto, K. Hirota, N. Niizaki, Y. Fujiwara, K. Ueki
A hybrid mode analysis of the coupled microstrip-coplanar lines was done, and the transmission and reflection characteristics at each port of the lines were calculated. Applying the coupling characteristics of these lines, a double-sided and miniaturized VCO was made.
{"title":"Small Size VCO Module for 900 MHz Band Using Coupled Microstrip-Coplanar Lines","authors":"K. Kawamoto, K. Hirota, N. Niizaki, Y. Fujiwara, K. Ueki","doi":"10.1109/MWSYM.1985.1132076","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132076","url":null,"abstract":"A hybrid mode analysis of the coupled microstrip-coplanar lines was done, and the transmission and reflection characteristics at each port of the lines were calculated. Applying the coupling characteristics of these lines, a double-sided and miniaturized VCO was made.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"66 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":"122261914","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.1985.1132093
E. Alanen, I. V. Linden
A method based on the exact image theory to calculate the near field distribution of a horn antenna in direct contact with the skin is introduced. Being exact, the method is not restricted by parameter values and can be applied in optimization of horn aperture function to produce focus fields in the human body. The method observes the effect of the skin layer and can be applied for an arbitrary aperture function. The optimization is demonstrated with few examples.
{"title":"Exact Image Theory for Field Calculationin Layered Biological Medium","authors":"E. Alanen, I. V. Linden","doi":"10.1109/MWSYM.1985.1132093","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132093","url":null,"abstract":"A method based on the exact image theory to calculate the near field distribution of a horn antenna in direct contact with the skin is introduced. Being exact, the method is not restricted by parameter values and can be applied in optimization of horn aperture function to produce focus fields in the human body. The method observes the effect of the skin layer and can be applied for an arbitrary aperture function. The optimization is demonstrated with few examples.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"101 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":"127072459","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.1985.1132021
B. Harris, P. Mayes
Techniques have previously been developed to determine the scattering parameters for lines or guides witn a single geometric step discontinuity ([1], [2], [7]). However, for a system with more than one closely spaced discontinuity the field interaction between the discontinuities must be taken into account. A technique outlined below, can in theory handle any number of closely spaced discontinuities.
{"title":"Analysis and Synthesis of Guides with Closely Spaced Discontinuities","authors":"B. Harris, P. Mayes","doi":"10.1109/MWSYM.1985.1132021","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1132021","url":null,"abstract":"Techniques have previously been developed to determine the scattering parameters for lines or guides witn a single geometric step discontinuity ([1], [2], [7]). However, for a system with more than one closely spaced discontinuity the field interaction between the discontinuities must be taken into account. A technique outlined below, can in theory handle any number of closely spaced discontinuities.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"37 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":"134138857","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.1985.1131944
B. Janiczak
The spectral domain technique is used to analyze multiconductor printed transmission-line structures containing layered dielectric substrate. Starting from general analytical formulation a useful modification of the procedure is suggesteti for accurate description of multiconductor interdigitated microstrip circuit with equally dimensioned conductors. Frequency dependent numerical results for some new microstrip and coplanar structures with more than two coupled lines are shown, discussed with respect to high-directivity multiconductor coupler applications.
{"title":"Multiconductor Planar Transmission-Line Structures for High-Directivity Coupler Applications","authors":"B. Janiczak","doi":"10.1109/MWSYM.1985.1131944","DOIUrl":"https://doi.org/10.1109/MWSYM.1985.1131944","url":null,"abstract":"The spectral domain technique is used to analyze multiconductor printed transmission-line structures containing layered dielectric substrate. Starting from general analytical formulation a useful modification of the procedure is suggesteti for accurate description of multiconductor interdigitated microstrip circuit with equally dimensioned conductors. Frequency dependent numerical results for some new microstrip and coplanar structures with more than two coupled lines are shown, discussed with respect to high-directivity multiconductor coupler applications.","PeriodicalId":446741,"journal":{"name":"1985 IEEE MTT-S International Microwave Symposium Digest","volume":"47 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":"134244939","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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