Pub Date : 1996-10-01DOI: 10.1109/EUMA.1996.337531
J. Mallat, P. Piironen, P. Lehikoinen, A. Lehto, J. Tuovinen, A. Raisanen
Awaveguide ring filter design for the 119 GHz heterodyne receiver of the Odin satellite is reported. The relatively narrow band filter is designed to operate without external tuners although the ambient temperature can vary from 100 K to 300 K. The critical temperature related changes in the center frequency of 114.85 GHz are compensated by the mechanical design with use of suitable materials. A maximum frequency shift of 440 MHz was reduced to 80 MHz in the first prototype, with further improvements to be expected in later models.
{"title":"Tunerless millimeter wave ring filter for wide temperature range","authors":"J. Mallat, P. Piironen, P. Lehikoinen, A. Lehto, J. Tuovinen, A. Raisanen","doi":"10.1109/EUMA.1996.337531","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337531","url":null,"abstract":"Awaveguide ring filter design for the 119 GHz heterodyne receiver of the Odin satellite is reported. The relatively narrow band filter is designed to operate without external tuners although the ambient temperature can vary from 100 K to 300 K. The critical temperature related changes in the center frequency of 114.85 GHz are compensated by the mechanical design with use of suitable materials. A maximum frequency shift of 440 MHz was reduced to 80 MHz in the first prototype, with further improvements to be expected in later models.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"240 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123990631","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337686
P. Greiling
InP-based device technology has superior microwave/millimeterwave performance for low noise, high efficiency power and high speed digital/analog applications. Presently InP-based devices are being utilized in communication satellites. In the future as military and commercial applications require wider bandwidths and higher operating frequencies, InP-based technology will be key to the deployment of these systems.
{"title":"InP-based microwave/millimeterwave technology for military and commercial markets","authors":"P. Greiling","doi":"10.1109/EUMA.1996.337686","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337686","url":null,"abstract":"InP-based device technology has superior microwave/millimeterwave performance for low noise, high efficiency power and high speed digital/analog applications. Presently InP-based devices are being utilized in communication satellites. In the future as military and commercial applications require wider bandwidths and higher operating frequencies, InP-based technology will be key to the deployment of these systems.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124208533","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337657
M. Ding, M. Al-Nuaimi
Fresnel-Kirchhoff diffraction theory, in essence physical optics, has been used to predict building reflection and scatter Bramely and Cherry (1) and Noerpel (2). Its strength in near and very near fields was clearly demonstrated by comparisons between predictions and measurements made on a number of buildings Al-Nuaimi and Ding (3). This method nevertheless involves complex surface integrals which are computationally expensive particularly for large buildings. For purposes of radio system planning, simple engineering prediction models are much desirable. In this paper, expansions of the Fresnel integral are approximated based on the very near field characteristics of buildings reflection and scatter concluded from the predictions and measurements (3). Building reflection and scatter patterns are expressed as simple functions of angle and distance dependencies. In comparison with the results of measurements and predictions of the more complete Fresnel-Kirchhoff method (3), validity of the model is assessed in presence of building features and background scatters which are not accounted for in this simple solution.
{"title":"Characterisation of building reflection and scatter of microwaves using Fresnel-Kirchhoff diffraction theory","authors":"M. Ding, M. Al-Nuaimi","doi":"10.1109/EUMA.1996.337657","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337657","url":null,"abstract":"Fresnel-Kirchhoff diffraction theory, in essence physical optics, has been used to predict building reflection and scatter Bramely and Cherry (1) and Noerpel (2). Its strength in near and very near fields was clearly demonstrated by comparisons between predictions and measurements made on a number of buildings Al-Nuaimi and Ding (3). This method nevertheless involves complex surface integrals which are computationally expensive particularly for large buildings. For purposes of radio system planning, simple engineering prediction models are much desirable. In this paper, expansions of the Fresnel integral are approximated based on the very near field characteristics of buildings reflection and scatter concluded from the predictions and measurements (3). Building reflection and scatter patterns are expressed as simple functions of angle and distance dependencies. In comparison with the results of measurements and predictions of the more complete Fresnel-Kirchhoff method (3), validity of the model is assessed in presence of building features and background scatters which are not accounted for in this simple solution.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121589095","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337718
A. Lerer, S. Tsvetkovskaya
Picosecond electromagnetic pulse diffraction was investigated by numerical - analytical method developed by authors to solve integral equatlons in the time domain.
采用作者提出的求解时域积分方程的数值解析方法研究了皮秒电磁脉冲衍射。
{"title":"Narrow electromagnetic pulse diffraction by slot","authors":"A. Lerer, S. Tsvetkovskaya","doi":"10.1109/EUMA.1996.337718","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337718","url":null,"abstract":"Picosecond electromagnetic pulse diffraction was investigated by numerical - analytical method developed by authors to solve integral equatlons in the time domain.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"437 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127604195","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337662
N. Roddis, G. Kitching
A compact L band antenna feed system is needed for use on 25m cassegrain radio telescopes. A horn fed lens antenna has been designed using CAD, and a scale model constructed. A mounting and positioning system has been devised for the full-size feed system. Results oftests on the model have been encouraging, and the initial computer model has been improved.
{"title":"A compact L band feed for a multi-frequency cassegrain radio telescope","authors":"N. Roddis, G. Kitching","doi":"10.1109/EUMA.1996.337662","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337662","url":null,"abstract":"A compact L band antenna feed system is needed for use on 25m cassegrain radio telescopes. A horn fed lens antenna has been designed using CAD, and a scale model constructed. A mounting and positioning system has been devised for the full-size feed system. Results oftests on the model have been encouraging, and the initial computer model has been improved.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128110502","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337712
S. Hagelin, L. Wernlund
In this contribution the conditions for obtaining circulator function in a ring network composed of nonreciprocal phase shifters and power dividers are studied. Analytical results and simulations of prestanda are presented. It is found that only one nonreciprocal phase shifter is needed, which leads to novel circulator configurations with more flexibility in the physical realisation. When realising the circulator with latched ferrite phase shifters no permanent magnet is required, which makes this circulator type a possible candidate for multilayer applications in densely packed microwave circuit architectures.
{"title":"Ferrite circulators for multilayer applications","authors":"S. Hagelin, L. Wernlund","doi":"10.1109/EUMA.1996.337712","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337712","url":null,"abstract":"In this contribution the conditions for obtaining circulator function in a ring network composed of nonreciprocal phase shifters and power dividers are studied. Analytical results and simulations of prestanda are presented. It is found that only one nonreciprocal phase shifter is needed, which leads to novel circulator configurations with more flexibility in the physical realisation. When realising the circulator with latched ferrite phase shifters no permanent magnet is required, which makes this circulator type a possible candidate for multilayer applications in densely packed microwave circuit architectures.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"326 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122259928","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337523
T. Musch
A low noise and low cost YIG-oscillator has been developed. In order to achieve a good phase noise performance it has been simulated employing only the linear scattering parameters of the transistors. Measurements on self built prototype circuits showed a good correspondence with the calculation. The frequency range up to 12 GHz was achieved using only standard Surface-Mounted-Devices (SMD). This grants for a low cost design because the components are not expensive and the circuit is easy to produce.
{"title":"A low noise and low cost YIG-oscillator in the frequency range from 4.5 GHz to 12 GHz","authors":"T. Musch","doi":"10.1109/EUMA.1996.337523","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337523","url":null,"abstract":"A low noise and low cost YIG-oscillator has been developed. In order to achieve a good phase noise performance it has been simulated employing only the linear scattering parameters of the transistors. Measurements on self built prototype circuits showed a good correspondence with the calculation. The frequency range up to 12 GHz was achieved using only standard Surface-Mounted-Devices (SMD). This grants for a low cost design because the components are not expensive and the circuit is easy to produce.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134052655","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337599
A. H. Darsinooieh, O. Palamutcuoglu
The nonlinear analysis of subharmonically drain pumped lumped and distributed MESFET mixers have been performed to find the optimum operation conditions. The isolation between the pump and RF ports is readily achieved in drain pumping. Furthermore, since the LO frequency is approximately half of RF signal very simple filter construction is sufficient to provide isolation between the two ports. The efficiency of the mixer is doubled by pumping the drain of two MESFET's with 180° phase difference. In the practical side of this work broadband operation has been achieved from a microwave mixer operating in X band by using microstrip ladder matching structure at RF side and 1:1 suspended microstrip balun for LO injection. The measured conversion gain at optimum bias and LO level conditions is around 1 dB. In the second step of this work the performance characteristics of three sections of unbalance and two sections of balance distributed mixer which are subharmonically drain pumped are considered to achieve wider bandwidth. Different bias conditions and scattering parameters over a frequency range of 2-18 GHz are used for the transistor's parameter optimizing. The whole circuit is also optimized with the aid of nonlinear simulator in Microwave Harmonica Program, version 5.5.
{"title":"Subharmonically drain pumped wideband lumped and distributed microwave MESFET mixers","authors":"A. H. Darsinooieh, O. Palamutcuoglu","doi":"10.1109/EUMA.1996.337599","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337599","url":null,"abstract":"The nonlinear analysis of subharmonically drain pumped lumped and distributed MESFET mixers have been performed to find the optimum operation conditions. The isolation between the pump and RF ports is readily achieved in drain pumping. Furthermore, since the LO frequency is approximately half of RF signal very simple filter construction is sufficient to provide isolation between the two ports. The efficiency of the mixer is doubled by pumping the drain of two MESFET's with 180° phase difference. In the practical side of this work broadband operation has been achieved from a microwave mixer operating in X band by using microstrip ladder matching structure at RF side and 1:1 suspended microstrip balun for LO injection. The measured conversion gain at optimum bias and LO level conditions is around 1 dB. In the second step of this work the performance characteristics of three sections of unbalance and two sections of balance distributed mixer which are subharmonically drain pumped are considered to achieve wider bandwidth. Different bias conditions and scattering parameters over a frequency range of 2-18 GHz are used for the transistor's parameter optimizing. The whole circuit is also optimized with the aid of nonlinear simulator in Microwave Harmonica Program, version 5.5.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126588154","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337659
G. N. Lebedeva
Requirements for a radiation pattern of a spherical reflecting antenna determine a permissible phase error over the illuminated aperture. In order to extend an illuminated range of the aperture plane with a permissible phase error, several added separate phased feeds (located beyond the axis of a spherical reflector) with the necessary parameters are suited. The numerical analysis (by means of geometrical optics) of a phase error at the aperture plane as a function of the deep of a spherical reflector for the added phased feed located beyond the axis was carried out and the results are presented graphically.
{"title":"Separate phased feeds for correcting spherical aberration","authors":"G. N. Lebedeva","doi":"10.1109/EUMA.1996.337659","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337659","url":null,"abstract":"Requirements for a radiation pattern of a spherical reflecting antenna determine a permissible phase error over the illuminated aperture. In order to extend an illuminated range of the aperture plane with a permissible phase error, several added separate phased feeds (located beyond the axis of a spherical reflector) with the necessary parameters are suited. The numerical analysis (by means of geometrical optics) of a phase error at the aperture plane as a function of the deep of a spherical reflector for the added phased feed located beyond the axis was carried out and the results are presented graphically.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131015721","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337682
A. Morini, T. Rozzi
Maxwell's equations for hollow metallic waveguides of arbitrary shape are solved by the power series method. The above technique is very flexible in application and permits to recover eigenvalues and eigenfunctions with excellent accuracy.
{"title":"Power series solution of Maxwell's equations of arbitrary shaped hollow waveguides","authors":"A. Morini, T. Rozzi","doi":"10.1109/EUMA.1996.337682","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337682","url":null,"abstract":"Maxwell's equations for hollow metallic waveguides of arbitrary shape are solved by the power series method. The above technique is very flexible in application and permits to recover eigenvalues and eigenfunctions with excellent accuracy.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"225 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133396093","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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