Pub Date : 1996-10-01DOI: 10.1109/EUMA.1996.337646
X. Ding, A. Jacob
A new broadband slot antenna with low cross-polarization is presented. It is realized by introducing metal stubs in the aperture of a conventional bow-tie slot antenna. A spectral domain moment method analysis shows that the cross-polarization can be reduced by about 15 dB. The SWR remains below 1.6 in the bandwidth fupper/flower=2.8. Experimental data are in good agreement with theoretical predictions.
{"title":"Novel broadband slot antenna with low cross-polarization","authors":"X. Ding, A. Jacob","doi":"10.1109/EUMA.1996.337646","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337646","url":null,"abstract":"A new broadband slot antenna with low cross-polarization is presented. It is realized by introducing metal stubs in the aperture of a conventional bow-tie slot antenna. A spectral domain moment method analysis shows that the cross-polarization can be reduced by about 15 dB. The SWR remains below 1.6 in the bandwidth fupper/flower=2.8. Experimental data are in good agreement with theoretical predictions.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"4 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":"125450150","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.1996.337634
M. Barciela, P. Tasker, M. Demmler, E. Sánchez
A nonquasi-static nonlinear table-based FET model, which has been implemented into a commercial Harmonic Balance Simulator (MDS), is described and demonstrated. It makes use of a simplified nonquasi-static charge formulation and also accounts for low frequency dispersion phenomena. It can be derived, fast and simply, from dc and small signal S-parameters and is general and technology and process independent. The model is accurate under dc, small and large signal operating conditions being able to perform excellent predictions up to high frequencies and over a wide bias range. Dynamic large signal model behaviour has been validated using pseudomorphic HEMT structures, by comparing measured and simulated input and output waveforms, dynamic load line and transfer characteristics. Excellent agreement between measurements and simulation results has been achieved in the frequency range from 2 to 50 GHz.
{"title":"A simplified nonquasi-static table based FET model","authors":"M. Barciela, P. Tasker, M. Demmler, E. Sánchez","doi":"10.1109/EUMA.1996.337634","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337634","url":null,"abstract":"A nonquasi-static nonlinear table-based FET model, which has been implemented into a commercial Harmonic Balance Simulator (MDS), is described and demonstrated. It makes use of a simplified nonquasi-static charge formulation and also accounts for low frequency dispersion phenomena. It can be derived, fast and simply, from dc and small signal S-parameters and is general and technology and process independent. The model is accurate under dc, small and large signal operating conditions being able to perform excellent predictions up to high frequencies and over a wide bias range. Dynamic large signal model behaviour has been validated using pseudomorphic HEMT structures, by comparing measured and simulated input and output waveforms, dynamic load line and transfer characteristics. Excellent agreement between measurements and simulation results has been achieved in the frequency range from 2 to 50 GHz.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"1 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":"123408523","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.1996.337729
C. Peixeiro, P. Dufrane, Y. Guillerme, A. Boulouard, E. Delhaye, B. Byzery
The 60 GHz microstrip patch antenna work carried out in the frame work of RACE project 2067 Mobile Broadband System (MBS) is described. Two approaches have been taken: develop both low cost antennas printed on plastic substrates and MMIC transmit and receive active integrated antennas printed on GaAs substrates. Some configurations have been designed, fabricated and tested. Simulated and experimental results are presented.
{"title":"Microstrip patch antennas at 60 GHz for RACE project MBS","authors":"C. Peixeiro, P. Dufrane, Y. Guillerme, A. Boulouard, E. Delhaye, B. Byzery","doi":"10.1109/EUMA.1996.337729","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337729","url":null,"abstract":"The 60 GHz microstrip patch antenna work carried out in the frame work of RACE project 2067 Mobile Broadband System (MBS) is described. Two approaches have been taken: develop both low cost antennas printed on plastic substrates and MMIC transmit and receive active integrated antennas printed on GaAs substrates. Some configurations have been designed, fabricated and tested. Simulated and experimental results are presented.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"75 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":"122451986","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.1996.337562
J. Alonso, J. M. Blas, J. Ramos, L. Garcia, J. Grajal, J. de Pablos, J. Gismero, F. Perez
An antenna system including antenna elements and a satellite tracking method is considered a key technology in implementing larid mobile satellite communications. This paper describes the development of two L-band satellite-tracking mobile-vehicular antenna systems for communications and navigation projects. The design and implementation of the different parts of both demonstrators, from stacked microstrip. patch array antenna to the signal processing circuits, including the microwave ICs and IF stages, will be addressed in this paper. Simulations and experimental data showing the performance of both demonstrators will be presented as well.
{"title":"Two prototypes of adaptive antenna receivers for mobile systems","authors":"J. Alonso, J. M. Blas, J. Ramos, L. Garcia, J. Grajal, J. de Pablos, J. Gismero, F. Perez","doi":"10.1109/EUMA.1996.337562","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337562","url":null,"abstract":"An antenna system including antenna elements and a satellite tracking method is considered a key technology in implementing larid mobile satellite communications. This paper describes the development of two L-band satellite-tracking mobile-vehicular antenna systems for communications and navigation projects. The design and implementation of the different parts of both demonstrators, from stacked microstrip. patch array antenna to the signal processing circuits, including the microwave ICs and IF stages, will be addressed in this paper. Simulations and experimental data showing the performance of both demonstrators will be presented as well.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"74 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":"126470025","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.1996.337623
J. L. Cáceres
A new dual mode cavity concept is presented based on the independent tuning of two orthogonal resonant modes inside a cavity. The use of this principle has been claimed in the past very frequently but violated in practice due to a confusing association between the electromagnetic system and its equivalent network representation. It is shown that the desired coupling effect inside the cavity is simply obtained when both resonant modes are simultaneously excited and tuned to different frequencies. A generic network representation for the dual mode cavity is proposed which is more clearly associated to the real electromagnetic system. The relation of this network with the standard filter synthesis network is shown and some fundamental design implications are derived that are not in full agreement with the classical design techniques. Based on this new understanding a simple tuning mechanism has been experimentally verified on typical channel filters.
{"title":"A new dual mode cavity concept","authors":"J. L. Cáceres","doi":"10.1109/EUMA.1996.337623","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337623","url":null,"abstract":"A new dual mode cavity concept is presented based on the independent tuning of two orthogonal resonant modes inside a cavity. The use of this principle has been claimed in the past very frequently but violated in practice due to a confusing association between the electromagnetic system and its equivalent network representation. It is shown that the desired coupling effect inside the cavity is simply obtained when both resonant modes are simultaneously excited and tuned to different frequencies. A generic network representation for the dual mode cavity is proposed which is more clearly associated to the real electromagnetic system. The relation of this network with the standard filter synthesis network is shown and some fundamental design implications are derived that are not in full agreement with the classical design techniques. Based on this new understanding a simple tuning mechanism has been experimentally verified on typical channel filters.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"10 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":"121040428","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.1996.337701
I. M. Boese, R. Collier
The paper will describe a novel measurement system which is part of a research project on the design of M3ICs at 140 GHz. The intension is to characterise on-wafer devices within the waveguide band 110 - 170 GHz using a dielectric waveguide multistate reflectometer (DMR). Although a lot of work has been done in recent years on realising 6 port and then 4 port reflectometers they either were built for frequency ranges below 100 GHz or they were realised using metallic waveguide technology.
{"title":"Novel measurement system within 110-170 GHz using a dielectric multistate refiectometer","authors":"I. M. Boese, R. Collier","doi":"10.1109/EUMA.1996.337701","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337701","url":null,"abstract":"The paper will describe a novel measurement system which is part of a research project on the design of M3ICs at 140 GHz. The intension is to characterise on-wafer devices within the waveguide band 110 - 170 GHz using a dielectric waveguide multistate reflectometer (DMR). Although a lot of work has been done in recent years on realising 6 port and then 4 port reflectometers they either were built for frequency ranges below 100 GHz or they were realised using metallic waveguide technology.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"22 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":"124942784","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.1996.337692
Y. N. Pchel'nikov
New way of calculation the fingers slow-wave structures of a two-wire type, based on the theory of multiconductors' lines and on the replacement of a real structure by an equivalent to it two-wire long line is offered. The offered method permits to calculate the dispersion characteristics not only one-row, but also of the two-row fingers structures. For the first time by calculation and on the basis of direct measurements the opportunity of an essential increase of electromagnetic waves' deceleration in fingers combs, located in parallel one upon the other, is shown. Results of experimental researches of effect of fingers' width and of the period of their arrangement on the value of deceleration are shown also.
{"title":"Fingers slow-wave structures","authors":"Y. N. Pchel'nikov","doi":"10.1109/EUMA.1996.337692","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337692","url":null,"abstract":"New way of calculation the fingers slow-wave structures of a two-wire type, based on the theory of multiconductors' lines and on the replacement of a real structure by an equivalent to it two-wire long line is offered. The offered method permits to calculate the dispersion characteristics not only one-row, but also of the two-row fingers structures. For the first time by calculation and on the basis of direct measurements the opportunity of an essential increase of electromagnetic waves' deceleration in fingers combs, located in parallel one upon the other, is shown. Results of experimental researches of effect of fingers' width and of the period of their arrangement on the value of deceleration are shown also.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"99 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":"125172905","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.1996.337568
Byung-sung Kim, Sangwook Nam
This paper presents a new large signal modeling technique for FET devices. The proposed method employs distributed approach using nonlinear transmission line based on GCA(Gradual Channel Approximation). The modeling procedure needs only a few S parameter measurements under cold bias condition and simple I-V measurements. The former is used to extract the channel conductance and gate capacitance and the latter to optimize the velocity-field relation. The large signal model can be directly established without any active biased S parameter measurements, ECP extraction, and laborious fitting procedures required in conventional empirical modelings.
{"title":"Nonlinear transmission line as a large signal model for HEMT","authors":"Byung-sung Kim, Sangwook Nam","doi":"10.1109/EUMA.1996.337568","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337568","url":null,"abstract":"This paper presents a new large signal modeling technique for FET devices. The proposed method employs distributed approach using nonlinear transmission line based on GCA(Gradual Channel Approximation). The modeling procedure needs only a few S parameter measurements under cold bias condition and simple I-V measurements. The former is used to extract the channel conductance and gate capacitance and the latter to optimize the velocity-field relation. The large signal model can be directly established without any active biased S parameter measurements, ECP extraction, and laborious fitting procedures required in conventional empirical modelings.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"34 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":"125642544","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.1996.337517
M. Pejanovic, Z. Veljovic, Z. Petrovíc
In this paper effects of trellis coded modulation in mobile radio systems are evaluated. The specific channel with timeselective fading process is considered. The complete descriptions of such channel and an appropriate receiver is given. General model for bit error rate calculations is presented. That model enables error determination for every type of fading encountered in mobile radio systems as well as for different TCM schemes. Here we chose to analyse trellis encoding in combination with PSK, PSK with pilot tone and DPSK.
{"title":"Evaluation of trellis coded modulation effects in time-selective fading mobile radio channel","authors":"M. Pejanovic, Z. Veljovic, Z. Petrovíc","doi":"10.1109/EUMA.1996.337517","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337517","url":null,"abstract":"In this paper effects of trellis coded modulation in mobile radio systems are evaluated. The specific channel with timeselective fading process is considered. The complete descriptions of such channel and an appropriate receiver is given. General model for bit error rate calculations is presented. That model enables error determination for every type of fading encountered in mobile radio systems as well as for different TCM schemes. Here we chose to analyse trellis encoding in combination with PSK, PSK with pilot tone and DPSK.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"17 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":"125618409","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.1996.337586
L. Priou, B. Uguen, G. Chassay
A noise scattering matrix statistical model of the Anechoïc Chamber measurement channel is first developed in the frequential domain, then in the time domain and in the holographic radar images domain. Building these models allows one to analyse the sensitivity of a common target classification tool, the Huynen parameters, for any target and then to construct a prediction model of the Huynen parameters sensitivity based on the measure of a single target scattering matrix [S].
{"title":"A dedicated radar imaging statistical model of the scattering matrix initially characterised in an anechoic chamber - Application to the Huynen parameters sensitivity analysis","authors":"L. Priou, B. Uguen, G. Chassay","doi":"10.1109/EUMA.1996.337586","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337586","url":null,"abstract":"A noise scattering matrix statistical model of the Anechoïc Chamber measurement channel is first developed in the frequential domain, then in the time domain and in the holographic radar images domain. Building these models allows one to analyse the sensitivity of a common target classification tool, the Huynen parameters, for any target and then to construct a prediction model of the Huynen parameters sensitivity based on the measure of a single target scattering matrix [S].","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"41 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979129","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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