Pub Date : 1978-10-01DOI: 10.1109/EUMA.1978.332627
N. Gremillet, G. Thomin, J. Marcou
High density component integration in guided optics needs reflecting devices. A holographic grating on the guide acting under Bragg conditions deviate the guided light. This reflexinn causes polarization changes so that a T.E. incident wave will give some T.M. reflected wave. Devices of this type have been experimentally studied with special attention to mode conversion efficacity. Theorical study is also reported in a two dimensional calculation. Vectorial normalization conditions in the unperturbed case are derived from Maxwell's equations. Coupled mode treatment of the perturbed propagation is given explaining main experimental results.
{"title":"Mode Conversion in Oblique Bragg Gratings for Integrated Optics","authors":"N. Gremillet, G. Thomin, J. Marcou","doi":"10.1109/EUMA.1978.332627","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332627","url":null,"abstract":"High density component integration in guided optics needs reflecting devices. A holographic grating on the guide acting under Bragg conditions deviate the guided light. This reflexinn causes polarization changes so that a T.E. incident wave will give some T.M. reflected wave. Devices of this type have been experimentally studied with special attention to mode conversion efficacity. Theorical study is also reported in a two dimensional calculation. Vectorial normalization conditions in the unperturbed case are derived from Maxwell's equations. Coupled mode treatment of the perturbed propagation is given explaining main experimental results.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125321675","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332526
H. Steyskal
Two identical MIC-transmit-receive units wlih 1 W CW output each were. forming a twin module. GaAs IMPATT diode power amplifiers and ferrite phase shifters were used. This type of components produced phase tracking of about 0.8 phase degrees/°C in CW operation, thereby setting limits for uncontrolled temperature differences in larger arrays. With 3 m us pulses, an intra-pulse phase variation of less tan 10 degrees was measured. Improvements concerning phase stability and efficiency are expected by the use of GaAs FETs and temperature compesated ferrites or replacement of ferrites by nonferrite components.
两个相同的mic收发单元，各有1w连续波输出。形成双模块。采用了GaAs IMPATT二极管功率放大器和铁氧体移相器。这种类型的组件在连续波操作中产生约0.8相度/°C的相位跟踪，从而限制了较大阵列中不受控制的温差。使用3 m us脉冲，测量到脉冲内相位变化小于10度。通过使用砷化镓场效应管和温度补偿铁氧体或用非铁氧体元件替代铁氧体，有望改善相稳定性和效率。
{"title":"Active X-Band Phased Array Modulesand their Phase Stability","authors":"H. Steyskal","doi":"10.1109/EUMA.1978.332526","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332526","url":null,"abstract":"Two identical MIC-transmit-receive units wlih 1 W CW output each were. forming a twin module. GaAs IMPATT diode power amplifiers and ferrite phase shifters were used. This type of components produced phase tracking of about 0.8 phase degrees/°C in CW operation, thereby setting limits for uncontrolled temperature differences in larger arrays. With 3 m us pulses, an intra-pulse phase variation of less tan 10 degrees was measured. Improvements concerning phase stability and efficiency are expected by the use of GaAs FETs and temperature compesated ferrites or replacement of ferrites by nonferrite components.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126510204","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332547
G. Basawapatna
This paper discusses the design and performance of a multi-stage wideband GaAs MESFET amplifier. The amplifier had a small signal gain of 12 to 20 dB in the frequency range of 2 to 18 GHz. The l-dB gain-compression point of the amplifier was 13 dBm and the saturated power output exceeded 16 dBm. The wideband matching techniques used and the trade-offs involved are discussed. Also discussed are the device parameters and their relationships to the performance of the amplifier.
{"title":"Design and Performance of a 2 to 18 GHz Medium Power Ga As Mesfet Amplifier","authors":"G. Basawapatna","doi":"10.1109/EUMA.1978.332547","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332547","url":null,"abstract":"This paper discusses the design and performance of a multi-stage wideband GaAs MESFET amplifier. The amplifier had a small signal gain of 12 to 20 dB in the frequency range of 2 to 18 GHz. The l-dB gain-compression point of the amplifier was 13 dBm and the saturated power output exceeded 16 dBm. The wideband matching techniques used and the trade-offs involved are discussed. Also discussed are the device parameters and their relationships to the performance of the amplifier.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"248 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125531487","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332507
V. Tulaja
A new structure for realization of commensurate TEM bandpass filters having equalized group delay in the passband has been developed and successfully tested. Two layers carrying the same short-shunt-stub structure are coupled over a dielectric interface. For the symmetrical case, the synthesis is described and the results obtained with trial filters are discussed.
{"title":"Commensurate Stripline Bandpass Filters with Equalized Group Delay Characteristics","authors":"V. Tulaja","doi":"10.1109/EUMA.1978.332507","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332507","url":null,"abstract":"A new structure for realization of commensurate TEM bandpass filters having equalized group delay in the passband has been developed and successfully tested. Two layers carrying the same short-shunt-stub structure are coupled over a dielectric interface. For the symmetrical case, the synthesis is described and the results obtained with trial filters are discussed.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128877509","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332529
A.A. Goaaher
An 18 channel, phase-matched Upconverter has been developed by Marconi Space and Defence Systems Ltd. The Upconverter translates the 18 separate IF signals from 30MHz to L-Band while maintaining the channel phase and amplitude relationships. To ease phase tracking problems a sub-harmonically pumped mixer is used. This provides an effective LO rejection greater than 50dB and thus enables a single conversion to be used without high-order filtering. The applications and limitations of sub-harmonically pumped mixing schemes applied to upconverters are discussed.
{"title":"An 18 Channel, Phase-Matched, Single-Conversion Upconverter from 30MHz to L-Band","authors":"A.A. Goaaher","doi":"10.1109/EUMA.1978.332529","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332529","url":null,"abstract":"An 18 channel, phase-matched Upconverter has been developed by Marconi Space and Defence Systems Ltd. The Upconverter translates the 18 separate IF signals from 30MHz to L-Band while maintaining the channel phase and amplitude relationships. To ease phase tracking problems a sub-harmonically pumped mixer is used. This provides an effective LO rejection greater than 50dB and thus enables a single conversion to be used without high-order filtering. The applications and limitations of sub-harmonically pumped mixing schemes applied to upconverters are discussed.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"19 23-24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133283275","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332634
P. Gibeau, J. Lacombe
{"title":"Gunn Effect Diodes for Millimeter Wavelengths","authors":"P. Gibeau, J. Lacombe","doi":"10.1109/EUMA.1978.332634","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332634","url":null,"abstract":"","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133933249","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332511
C. Liechti
Over the last decade, GaAs FET's have made dramatic advances in low-noise and efficient power amplification. These advances are highlighted and possible pathways for future developments are shown. Looking further ahead, it is important to realize that GaAs technology holds the key to microwave monolithic-integrated circuits.** "Where are GaAs IC's today, and where do we go from here?" These and related questions are briefly covered in this paper.
{"title":"Microwave FET's - What's Next?","authors":"C. Liechti","doi":"10.1109/EUMA.1978.332511","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332511","url":null,"abstract":"Over the last decade, GaAs FET's have made dramatic advances in low-noise and efficient power amplification. These advances are highlighted and possible pathways for future developments are shown. Looking further ahead, it is important to realize that GaAs technology holds the key to microwave monolithic-integrated circuits.** \"Where are GaAs IC's today, and where do we go from here?\" These and related questions are briefly covered in this paper.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132820845","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332575
B. Raicu, G. Dinca
{"title":"Microstrips for Microwave Circuits Made by ION Plating","authors":"B. Raicu, G. Dinca","doi":"10.1109/EUMA.1978.332575","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332575","url":null,"abstract":"","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129932137","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332542
A. Mohsen
The matrix eigenvalue problem resulting from the finite-difference analysis of waveguides is treated using the power method. The method does not require prior estimate of the eigenvalue and demands minimum computer storage. The rapidity of convergence is demonstrated and methods to accelerate the convergence are presented. The advantages of the method compared to direct and other iterative approaches are discussed. The reduction of some design criterion to forms which can be treated by the method is also presented.
{"title":"The Power Method: A Technique for Guiding Structure Analysis and an Approach to Microwave Circuit Synthesis","authors":"A. Mohsen","doi":"10.1109/EUMA.1978.332542","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332542","url":null,"abstract":"The matrix eigenvalue problem resulting from the finite-difference analysis of waveguides is treated using the power method. The method does not require prior estimate of the eigenvalue and demands minimum computer storage. The rapidity of convergence is demonstrated and methods to accelerate the convergence are presented. The advantages of the method compared to direct and other iterative approaches are discussed. The reduction of some design criterion to forms which can be treated by the method is also presented.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129367901","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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