Pub Date : 1994-10-01DOI: 10.1109/EUMA.1994.337250
D. Kinowski, M. Guglielmi
Angular bandpass filters find application in advanced antenna feed systems for space applications as diplexers or as devices to reduce the effects of unwanted grating lobes. In this paper a new approach for the design of angular bandpass filters composed of cascaded metal-strip gratings is proposed. Contrary to the conventional "diffraction" approach where the resonating element is the grating itself, in the new approach the basic resonator is composed of two cascaded gratings. The distance between the two gratings represents the length of the resonator while the inter-resonator coupling can be adjusted by varying the widths of the metal strips. This alternative approach, called the "guided" approach, does not add significant complication to the structure but greatly enhances its electrical performances. It will be shown in fact that, following the approach we propose, the frequency behavior of the filter can be completely decoupled from its angular behavior in the design process thereby considerably increasing the design freedom.
{"title":"Synthesis of Angular Bandpass Filters","authors":"D. Kinowski, M. Guglielmi","doi":"10.1109/EUMA.1994.337250","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337250","url":null,"abstract":"Angular bandpass filters find application in advanced antenna feed systems for space applications as diplexers or as devices to reduce the effects of unwanted grating lobes. In this paper a new approach for the design of angular bandpass filters composed of cascaded metal-strip gratings is proposed. Contrary to the conventional \"diffraction\" approach where the resonating element is the grating itself, in the new approach the basic resonator is composed of two cascaded gratings. The distance between the two gratings represents the length of the resonator while the inter-resonator coupling can be adjusted by varying the widths of the metal strips. This alternative approach, called the \"guided\" approach, does not add significant complication to the structure but greatly enhances its electrical performances. It will be shown in fact that, following the approach we propose, the frequency behavior of the filter can be completely decoupled from its angular behavior in the design process thereby considerably increasing the design freedom.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131279069","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337440
C. Pinatel, S. Vuye, A. Konczykowska, H. Wang
Different HBTs operating classes have been compared using a simulated multiharmonic load-pull type optimization taking into account the supply voltage criteria. The optimum operating class taking into account the power density and the thermal effect has been discussed. The low bias voltage operation of HBT has been investigated. An HBT amplifier has been designed and fabricated for DCS1800. 1 W output power with a power-added efficiency df 50% has been measured.
{"title":"High power efficiency AlGaAs-GaAs HBT for mobile communications","authors":"C. Pinatel, S. Vuye, A. Konczykowska, H. Wang","doi":"10.1109/EUMA.1994.337440","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337440","url":null,"abstract":"Different HBTs operating classes have been compared using a simulated multiharmonic load-pull type optimization taking into account the supply voltage criteria. The optimum operating class taking into account the power density and the thermal effect has been discussed. The low bias voltage operation of HBT has been investigated. An HBT amplifier has been designed and fabricated for DCS1800. 1 W output power with a power-added efficiency df 50% has been measured.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121875838","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337476
D. Sánchez-Hernández, I. Robertson
This paper presents a 60 GHz-band active microstrip patch antema using a Gunn diode as an oscillator in a reflection amplifier configuration. The oscillator consists of a patch antenna, the matching and bias circuit and an Alpha Industries DGB8266 packaged Gunn diode. 9.26 mW are obtained at 63.24 GHz. A tuning bandwidth of 1 GHz is attained by varying the dc bias voltage. The radiation pattems agree well with the theory and low level cross-polarisation patterns are achieved over a broad bandwidth. The 60 GHz-band is particularly important for micro-cellular mobile communications, and this active antenna is ideally suited for base-station applications in the 62.5/63.5 GHz bands intended for the European Mobile Broadband System (MBS).
{"title":"60 GHz-Band Active Patch Antenna for Spatial Power Combining Arrays in European Mobile Communication Systems","authors":"D. Sánchez-Hernández, I. Robertson","doi":"10.1109/EUMA.1994.337476","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337476","url":null,"abstract":"This paper presents a 60 GHz-band active microstrip patch antema using a Gunn diode as an oscillator in a reflection amplifier configuration. The oscillator consists of a patch antenna, the matching and bias circuit and an Alpha Industries DGB8266 packaged Gunn diode. 9.26 mW are obtained at 63.24 GHz. A tuning bandwidth of 1 GHz is attained by varying the dc bias voltage. The radiation pattems agree well with the theory and low level cross-polarisation patterns are achieved over a broad bandwidth. The 60 GHz-band is particularly important for micro-cellular mobile communications, and this active antenna is ideally suited for base-station applications in the 62.5/63.5 GHz bands intended for the European Mobile Broadband System (MBS).","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"875 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128128914","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337417
P. Febvre, W. Mcgrath, B. Bumble, H. Leduc, S. George, G. Ruffié, G. Beaudin
Heterodyne receivers using SIS (Superconductor-Insulator-Superconductor) junctions are the most sensitive receivers for radioastronomy in the millimeter wave and submillimeter wave frequency range. These instruments use superconducting RF tuning circuits to resonate out the high shunt capacitance of the SIS junction in order to provide a good impedance match with the microwave envionment at the frequency of operation. An accurate model to determine the electrical propeties of impedance matching circuits has been developed. An analysis of superconducting microstrip lines and radial stubs taking into account the fringing fields of the thick electrode, the step discontinuities, and the Mattis-Bardeen complex conductivity for the superconductor surface impedance is presented. This model is used to calculate the resonance frequencies of the matching circuit with the capacitively-'shunted SIS junction. Good agreement is found between calculated and experimentally measured resonance frequencies at 550-600 GHz.
{"title":"Superconducting RF tuning circuits for low-noise submillimeter wave SIS receivers","authors":"P. Febvre, W. Mcgrath, B. Bumble, H. Leduc, S. George, G. Ruffié, G. Beaudin","doi":"10.1109/EUMA.1994.337417","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337417","url":null,"abstract":"Heterodyne receivers using SIS (Superconductor-Insulator-Superconductor) junctions are the most sensitive receivers for radioastronomy in the millimeter wave and submillimeter wave frequency range. These instruments use superconducting RF tuning circuits to resonate out the high shunt capacitance of the SIS junction in order to provide a good impedance match with the microwave envionment at the frequency of operation. An accurate model to determine the electrical propeties of impedance matching circuits has been developed. An analysis of superconducting microstrip lines and radial stubs taking into account the fringing fields of the thick electrode, the step discontinuities, and the Mattis-Bardeen complex conductivity for the superconductor surface impedance is presented. This model is used to calculate the resonance frequencies of the matching circuit with the capacitively-'shunted SIS junction. Good agreement is found between calculated and experimentally measured resonance frequencies at 550-600 GHz.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"382 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132909093","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337387
H. Jin, R. Vahldieck, H. Minkus
Flip-chip interconnections between MMIC's and the motherboard are analyzed rigorously using the frequency-domain TLM (FDTLM) method. It is found that flip-chip packaging shows generally better performance than wire bond transitions and that the reflections from the bump discontinuity depends critically on the bump height and the type of transmission line used. Bump discontinuities between CPW motherboard and CPW chip show better transition performance than bump transitions between mincrostrip lines. For small overlap length between transmission lines the effect on the s-parameters is negligible.
{"title":"FDTLM Analysis of Broadband Flip-Chip Interconnections","authors":"H. Jin, R. Vahldieck, H. Minkus","doi":"10.1109/EUMA.1994.337387","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337387","url":null,"abstract":"Flip-chip interconnections between MMIC's and the motherboard are analyzed rigorously using the frequency-domain TLM (FDTLM) method. It is found that flip-chip packaging shows generally better performance than wire bond transitions and that the reflections from the bump discontinuity depends critically on the bump height and the type of transmission line used. Bump discontinuities between CPW motherboard and CPW chip show better transition performance than bump transitions between mincrostrip lines. For small overlap length between transmission lines the effect on the s-parameters is negligible.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124994683","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337399
P. Rolland, H. Blanck, A. Tachafine, J. Belquin, S. Delage, E. Chartier
2D and 1 D hydrodynamic non stationary models of HBT's have been developed and used for the optimisation of GaInP/GaAs HBT structures for high power amplification at X band. These physical models can be coupled to the circuit either in the time domain or using an harmonic balance procedure. Linear and non linear electrical circuits of these devices were also extracted from the physical simulation results. This approach allows a good understanding of the main physical phenomena and an accurate description of the electrical parameters as a function of the various bias conditions and operating temperature.
{"title":"Optimisation of GaInP/GaAs HBT structures for high power operation at X-band and extraction of non linear electrical circuits for CAD","authors":"P. Rolland, H. Blanck, A. Tachafine, J. Belquin, S. Delage, E. Chartier","doi":"10.1109/EUMA.1994.337399","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337399","url":null,"abstract":"2D and 1 D hydrodynamic non stationary models of HBT's have been developed and used for the optimisation of GaInP/GaAs HBT structures for high power amplification at X band. These physical models can be coupled to the circuit either in the time domain or using an harmonic balance procedure. Linear and non linear electrical circuits of these devices were also extracted from the physical simulation results. This approach allows a good understanding of the main physical phenomena and an accurate description of the electrical parameters as a function of the various bias conditions and operating temperature.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125479818","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337209
M. Akaike
Recent growing demand, both in quantity and quality, for communications triggers the communication technology to incorporate and integrate media of two different genre, i.e., microwaves and lightwaves (optics). Devices and systems utilizing both microwave and optical technologies are investigated. Recent research and development in this field are reviewed in this paper. Characteristics of radio and optical fibers are reviewed, and subcarrier multiplexing systems and opto-microwave devices are described.
{"title":"Trends of Research on Microwaves/Optics in Japan","authors":"M. Akaike","doi":"10.1109/EUMA.1994.337209","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337209","url":null,"abstract":"Recent growing demand, both in quantity and quality, for communications triggers the communication technology to incorporate and integrate media of two different genre, i.e., microwaves and lightwaves (optics). Devices and systems utilizing both microwave and optical technologies are investigated. Recent research and development in this field are reviewed in this paper. Characteristics of radio and optical fibers are reviewed, and subcarrier multiplexing systems and opto-microwave devices are described.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134099225","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337385
T. Rother, K. Schmidt
A new formalism for studying electromagnetic scattering on nonspherical axisymmetric particles is presented. The main advantages of this formalism are the strong similarity to the well-known Mie theory, the simple convergence behaviour and the use of expansion functions that are better adapted to the nonspherical scatterer geometry than spherical harmonics. Numerical results for the scattering characteristics of an ellipsoid and a sphere in the microwave region will be given.
{"title":"The Discretized Mie - Formalism for Electromagnetic Scattering on Nonspherbcal Axisymmetric Particles in the Microwave Region","authors":"T. Rother, K. Schmidt","doi":"10.1109/EUMA.1994.337385","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337385","url":null,"abstract":"A new formalism for studying electromagnetic scattering on nonspherical axisymmetric particles is presented. The main advantages of this formalism are the strong similarity to the well-known Mie theory, the simple convergence behaviour and the use of expansion functions that are better adapted to the nonspherical scatterer geometry than spherical harmonics. Numerical results for the scattering characteristics of an ellipsoid and a sphere in the microwave region will be given.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134144585","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 : 1994-10-01DOI: 10.1109/EUMA.1994.337510
H. Buret, M. Hutbner, B. Rattay, A. Recly, C. Tronche
A set of MMICs at Ka-band including a 30GHz Low Noise Amplifier, a 30/ 20GHz Down-converting Mixer, a 20GHz Low Level Amplifier and a 20GHz Analog Attenuator has been designed at the LEMMIC1, manufactured and measured. Performances at the end of the first design cycle are in very good agreement with simulations.
{"title":"MMICs for 30/20GHz Space Equipments","authors":"H. Buret, M. Hutbner, B. Rattay, A. Recly, C. Tronche","doi":"10.1109/EUMA.1994.337510","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337510","url":null,"abstract":"A set of MMICs at Ka-band including a 30GHz Low Noise Amplifier, a 30/ 20GHz Down-converting Mixer, a 20GHz Low Level Amplifier and a 20GHz Analog Attenuator has been designed at the LEMMIC1, manufactured and measured. Performances at the end of the first design cycle are in very good agreement with simulations.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134498567","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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