Pub Date : 2001-10-01DOI: 10.1109/EUMA.2001.339058
P. Eskelinen, H. Eskelinen, A. Serkola, J. Peltonen
Through careful dimensioning, avoidance of line transition discontinuities and by using special blocking elements to reduce stray couplings across the internal airgap together with inductive fine-tuning posts, a conventional ring hybrid can be an attractive RF power combiner for L- or S-band transceiver applications, where a high isolation is desired between the transmitter output arrangement and the receiving front-end, or for antenna arrays. When typical commercial units hardly exceed 40 dB, an improved narrow-band isolation up to 90 dB and more is demonstrated here while keeping the residual attenuation for desired coupling below 0.15 dB. The required milling and mounting uncertainty for a successful and repeatable result in a combined metallic / PTFE stripline form was found to be 0.01 mm.
{"title":"A High-Isolation S-Band Ring Hybrid Combiner","authors":"P. Eskelinen, H. Eskelinen, A. Serkola, J. Peltonen","doi":"10.1109/EUMA.2001.339058","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339058","url":null,"abstract":"Through careful dimensioning, avoidance of line transition discontinuities and by using special blocking elements to reduce stray couplings across the internal airgap together with inductive fine-tuning posts, a conventional ring hybrid can be an attractive RF power combiner for L- or S-band transceiver applications, where a high isolation is desired between the transmitter output arrangement and the receiving front-end, or for antenna arrays. When typical commercial units hardly exceed 40 dB, an improved narrow-band isolation up to 90 dB and more is demonstrated here while keeping the residual attenuation for desired coupling below 0.15 dB. The required milling and mounting uncertainty for a successful and repeatable result in a combined metallic / PTFE stripline form was found to be 0.01 mm.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131350226","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 : 2001-10-01DOI: 10.1109/EUMA.2001.338963
G. Macchiarella, Alberto Bovatti
This paper describes how to approach the design of microstrip filters with requirements in one passband and one stopband, both of finite extension (single-sided filters). Suitable filter topologies have been investigated, which allow having the filter passband either above or below the filter stopband. A design procedure, originally developed for waveguide single-sided filters, has been adapted also for this class of filters; the designed filters exhibit a quasi equiripple response both in the passband and in the stopband. The procedure has been first verified with electromagnetic simulations (using planar commercial simulators); then, using the proposed approach, a test microstrip filter in the DCS 1800 cellular band has been designed and fabricated employing standard PCB technology; the measurements have shown a satisfactory agreement with the simulations.
{"title":"Single-Sided Filters in Microstrip Technology","authors":"G. Macchiarella, Alberto Bovatti","doi":"10.1109/EUMA.2001.338963","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338963","url":null,"abstract":"This paper describes how to approach the design of microstrip filters with requirements in one passband and one stopband, both of finite extension (single-sided filters). Suitable filter topologies have been investigated, which allow having the filter passband either above or below the filter stopband. A design procedure, originally developed for waveguide single-sided filters, has been adapted also for this class of filters; the designed filters exhibit a quasi equiripple response both in the passband and in the stopband. The procedure has been first verified with electromagnetic simulations (using planar commercial simulators); then, using the proposed approach, a test microstrip filter in the DCS 1800 cellular band has been designed and fabricated employing standard PCB technology; the measurements have shown a satisfactory agreement with the simulations.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132112023","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339097
J. Shaker, M. Cuhaci, J. Sydor
A novel multilayer Frequency Selective Surface (FSS) is proposed for the suppression of far side lobes of radiating elements. Based on the affinity of the proposed structure with a Fabry-Perot resonator, a method is developed for its analysis and design. A double layer filter is designed, fabricated, and used in conjunction with several radiating elements that suppressed side lobes in the angular range of 40° - 50° by 15dB.
{"title":"Application of Fabry-Perot resonator for sidelobe suppression of antenna elements and arrays","authors":"J. Shaker, M. Cuhaci, J. Sydor","doi":"10.1109/EUMA.2001.339097","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339097","url":null,"abstract":"A novel multilayer Frequency Selective Surface (FSS) is proposed for the suppression of far side lobes of radiating elements. Based on the affinity of the proposed structure with a Fabry-Perot resonator, a method is developed for its analysis and design. A double layer filter is designed, fabricated, and used in conjunction with several radiating elements that suppressed side lobes in the angular range of 40° - 50° by 15dB.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132476086","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339076
T. Meyer, A. Jostingmeier, A. Omar
A novel imaging method for the permittivity distribution in biological tissues is presented. It allows for the simultaneous reconstruction of real and imaginary parts of the permittivity and is applicable to strong scatterers and media with losses as high as in most biological tissues. The method is based on the spectral expansion of the permittivity function in the material under test. Availability is demonstrated on simulation results and actual measurement data. The necessary adaptations and the application of the new method in non-TEM structures such as waveguides are described and verified. The method showed very good accuracy and excellent stability in all cases.
{"title":"Microwave Imaging Using Spectral Expansion of the Object Function","authors":"T. Meyer, A. Jostingmeier, A. Omar","doi":"10.1109/EUMA.2001.339076","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339076","url":null,"abstract":"A novel imaging method for the permittivity distribution in biological tissues is presented. It allows for the simultaneous reconstruction of real and imaginary parts of the permittivity and is applicable to strong scatterers and media with losses as high as in most biological tissues. The method is based on the spectral expansion of the permittivity function in the material under test. Availability is demonstrated on simulation results and actual measurement data. The necessary adaptations and the application of the new method in non-TEM structures such as waveguides are described and verified. The method showed very good accuracy and excellent stability in all cases.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130405403","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339003
M. Farina, Amedeo Grilli, A. Panzeri, T. Rozzi
In this contribution we describe the design and the measured performances of a quasi-optical self-oscillating balanced mixer for C-band, integrating a couple of discrete pHEMTs in a coplanar antenna.
{"title":"A C-Band Quasi-Optical Self-Oscillating Balanced Mixer","authors":"M. Farina, Amedeo Grilli, A. Panzeri, T. Rozzi","doi":"10.1109/EUMA.2001.339003","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339003","url":null,"abstract":"In this contribution we describe the design and the measured performances of a quasi-optical self-oscillating balanced mixer for C-band, integrating a couple of discrete pHEMTs in a coplanar antenna.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130864770","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339039
G. Michaud, J. Bulgarelli, M. Pouysegur, P. de Chateau Thierry, L. Rey
Alcatel developed a new generation of dual-frequency radar altimeter (POSEIDON 2) which works in C and Ku band. This article discusses about the radiofrequency unit (RFU) which plays a major role for the stringent performances of the altimeter. The compact RF unit has been designed with a modular concept. It uses the new advanced technologies: extensively use of MMIC, pHemt LNA and hybrid HFET power amplifiers. The transmitted peak power level is greater than 23W in C band and 7W in Ku band.
{"title":"New generation of RF unit for radar altimeter","authors":"G. Michaud, J. Bulgarelli, M. Pouysegur, P. de Chateau Thierry, L. Rey","doi":"10.1109/EUMA.2001.339039","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339039","url":null,"abstract":"Alcatel developed a new generation of dual-frequency radar altimeter (POSEIDON 2) which works in C and Ku band. This article discusses about the radiofrequency unit (RFU) which plays a major role for the stringent performances of the altimeter. The compact RF unit has been designed with a modular concept. It uses the new advanced technologies: extensively use of MMIC, pHemt LNA and hybrid HFET power amplifiers. The transmitted peak power level is greater than 23W in C band and 7W in Ku band.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133634424","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 : 2001-10-01DOI: 10.1109/EUMA.2001.338914
D. Ahn, Chul-Soo Kim, Jun-Seok Park, Kwang-Yong Kang
In this paper, a coupled line type waveguide bandpass filter is newly proposed. The proposed bandpass filter configuration consists of magnetically coupled waveguide cavities. In order to show the background of the proposed waveguide bandpass filter, the general coupled line TEM bandpass filter theory, which means the coupled line filter with arbitrary coupled line length and impedance level, will be briefly introduced. Measured result of an implemented coupled line type waveguide filter is presented.
{"title":"A Coupled Line Type Waveguide Bandpass Filter","authors":"D. Ahn, Chul-Soo Kim, Jun-Seok Park, Kwang-Yong Kang","doi":"10.1109/EUMA.2001.338914","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338914","url":null,"abstract":"In this paper, a coupled line type waveguide bandpass filter is newly proposed. The proposed bandpass filter configuration consists of magnetically coupled waveguide cavities. In order to show the background of the proposed waveguide bandpass filter, the general coupled line TEM bandpass filter theory, which means the coupled line filter with arbitrary coupled line length and impedance level, will be briefly introduced. Measured result of an implemented coupled line type waveguide filter is presented.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114676928","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339193
R. Koller, A. Stelzer, K.-H. Abt, R. Weigel
The demand for ever increasing talking times and reduced weight of modern GSM handsets can only be achieved by a significant reduction of the power consumption of the cellular handset, mostly the power the power amplifier (PA). The constant evelope modulation scheme of the GSM system allows the desing of high efficiency power amplifier, such as switching amplifiers. Among them. them, the Class-E amplifier concept is best suited, because it allows about 80% efficiency, while maintaining an excellent output spectrum and reasonable gain. Another advantage is the possibility to an a-priori design an characterization of the amplifier stage by simulation this fact is demonstrated in this paper, by comparing simulation and measurement results of a 45-MHz Class-E amplifier as a 1:20 frequency scaled model of a 900-MHz GSM power amplifier. The excellent match between theory and measurement allows a good prediction of the final Class-E amplifier characteristics by simulation.
{"title":"A Novel High Effciency Power Amplifier Concept for GSM Handsets","authors":"R. Koller, A. Stelzer, K.-H. Abt, R. Weigel","doi":"10.1109/EUMA.2001.339193","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339193","url":null,"abstract":"The demand for ever increasing talking times and reduced weight of modern GSM handsets can only be achieved by a significant reduction of the power consumption of the cellular handset, mostly the power the power amplifier (PA). The constant evelope modulation scheme of the GSM system allows the desing of high efficiency power amplifier, such as switching amplifiers. Among them. them, the Class-E amplifier concept is best suited, because it allows about 80% efficiency, while maintaining an excellent output spectrum and reasonable gain. Another advantage is the possibility to an a-priori design an characterization of the amplifier stage by simulation this fact is demonstrated in this paper, by comparing simulation and measurement results of a 45-MHz Class-E amplifier as a 1:20 frequency scaled model of a 900-MHz GSM power amplifier. The excellent match between theory and measurement allows a good prediction of the final Class-E amplifier characteristics by simulation.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"1655 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114930723","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339034
R. Ispir, A. Miyata, K. Kawahata, M. Ida, Y. Ishikawa
A linear array of oscillators each connected to a radiator to combine output power of the oscillators in free-space can be used in order to scan the radiated beam electronically by controlling free-running frequencies of both end oscillators. We applied this technique to Frequency Modulated Continuous Wave (FMCW) radar to perform electronically beam scanning to detect angle information in addition to range and speed information of the target. A two-element coupled voltage controlled oscillator array with frequency modulation capability was constructed at 10.4GHz. The radiation beam could be scanned 24° continuously.
{"title":"Frequency Modulated Coupled Oscillator Arrays","authors":"R. Ispir, A. Miyata, K. Kawahata, M. Ida, Y. Ishikawa","doi":"10.1109/EUMA.2001.339034","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339034","url":null,"abstract":"A linear array of oscillators each connected to a radiator to combine output power of the oscillators in free-space can be used in order to scan the radiated beam electronically by controlling free-running frequencies of both end oscillators. We applied this technique to Frequency Modulated Continuous Wave (FMCW) radar to perform electronically beam scanning to detect angle information in addition to range and speed information of the target. A two-element coupled voltage controlled oscillator array with frequency modulation capability was constructed at 10.4GHz. The radiation beam could be scanned 24° continuously.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116892821","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 : 2001-10-01DOI: 10.1109/EUMA.2001.339157
C. Railton
In this contribution it is shown that small changes to the choice of cell size in the FDTD and TLM methods can have a large effect on the predicted behaviour of a microstrip filter but that the use of Pre-calculated Correction Factors (PCFs) can vastly reduce this effect and also yield more accurate answers for a specified cell size.
{"title":"The Choice of Cell Size and the use of Pre-Calculated Correction Factors in the Analysis of Planar Circuits using FDTD and TLM","authors":"C. Railton","doi":"10.1109/EUMA.2001.339157","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339157","url":null,"abstract":"In this contribution it is shown that small changes to the choice of cell size in the FDTD and TLM methods can have a large effect on the predicted behaviour of a microstrip filter but that the use of Pre-calculated Correction Factors (PCFs) can vastly reduce this effect and also yield more accurate answers for a specified cell size.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117234477","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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