Pub Date : 2001-10-01DOI: 10.1109/EUMA.2001.338973
A. Yarovoy, P. van Genderen, L. Ligthart
The paper describes the design of a multi-sensor ultra wideband GPR front-end suitable for subsurface imaging with resolution sufficient for antipersonnel mine recognition. The front-end comprises two sensors: a multi-static video impulse radar and a bistatic stepped-frequency continuous wave radar. In comparison with commercially available video impulse GPR systems the key advantages of the video impulse system are considerably larger bandwidth, high precision of measurements of scattered field, ability to measure polarimetric structure of the scattered field and high pulse repetition rate resulting in fast data acquistion. The principal advantage of the stepped-frequency continuous wave sensor over its predecessors is very short data acquisition time, which is comparable with that of video impulse radars.
{"title":"Experimental Multi-Sensor GPR System for Humanitarian Demining","authors":"A. Yarovoy, P. van Genderen, L. Ligthart","doi":"10.1109/EUMA.2001.338973","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338973","url":null,"abstract":"The paper describes the design of a multi-sensor ultra wideband GPR front-end suitable for subsurface imaging with resolution sufficient for antipersonnel mine recognition. The front-end comprises two sensors: a multi-static video impulse radar and a bistatic stepped-frequency continuous wave radar. In comparison with commercially available video impulse GPR systems the key advantages of the video impulse system are considerably larger bandwidth, high precision of measurements of scattered field, ability to measure polarimetric structure of the scattered field and high pulse repetition rate resulting in fast data acquistion. The principal advantage of the stepped-frequency continuous wave sensor over its predecessors is very short data acquisition time, which is comparable with that of video impulse radars.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"10 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":"130871365","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.2001.338916
J. Saily, J. Mallat, A. Raisanen
The design and construction of a submillimetre wave phase-locked backward-wave oscillator source and its application for extending the dynamic range of a vector network analyzer are presented. Measured dynamic range improvement with this new source system over a frequency-multiplied Gunn oscillator varies between 16-20 dB over the frequency range of 300-400 GHz. Estimated improvement based on the power level difference at 700 GHz is about 40 dB.
{"title":"Using a Phase-Locked Backward-Wave Oscillator (BWO) to Extend the Dynamic Range of a Vector Network Analyzer at Submillimetre Wavelengths","authors":"J. Saily, J. Mallat, A. Raisanen","doi":"10.1109/EUMA.2001.338916","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338916","url":null,"abstract":"The design and construction of a submillimetre wave phase-locked backward-wave oscillator source and its application for extending the dynamic range of a vector network analyzer are presented. Measured dynamic range improvement with this new source system over a frequency-multiplied Gunn oscillator varies between 16-20 dB over the frequency range of 300-400 GHz. Estimated improvement based on the power level difference at 700 GHz is about 40 dB.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"32 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":"127870918","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.2001.339174
U. Rosenberg, J. Bornemann, S. Amari
A novel 90-degree waveguide twist is presented. The design features compactness by utilizing a central triple-mode quarter-wave transformer region between input and output waveguides of different cross sections. Return-loss values in excess of 30 dB are obtained over an operating bandwidth close to 20 percent. Larger bandwidths are obtained by using additional quarter-wave steps preceding and/or succeeding the central transformer region. Several different design examples at 4, 6, 19 and 26 GHz are presented for this unique 90-degree twist transformer approach. Experimental verification is provided in the 6 and 19 GHz range.
{"title":"A Compact and Broadband 90-Degree Waveguide Twist Transformer for Integrated Waveguide Subsystems","authors":"U. Rosenberg, J. Bornemann, S. Amari","doi":"10.1109/EUMA.2001.339174","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339174","url":null,"abstract":"A novel 90-degree waveguide twist is presented. The design features compactness by utilizing a central triple-mode quarter-wave transformer region between input and output waveguides of different cross sections. Return-loss values in excess of 30 dB are obtained over an operating bandwidth close to 20 percent. Larger bandwidths are obtained by using additional quarter-wave steps preceding and/or succeeding the central transformer region. Several different design examples at 4, 6, 19 and 26 GHz are presented for this unique 90-degree twist transformer approach. Experimental verification is provided in the 6 and 19 GHz range.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"9 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":"126755381","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.2001.339072
Cham Kiong Queck, L. Davis
A 4-port microstrip Ferrite Coupled-Line (FCL) circulator is designed at 11.4 GHz by cascading a longitudinally-magnetized FCL structure with a 180° hybrid coupler. A broadband 180° hybrid ring with a bandwidth of approximately 7 GHz is realised by employing stepped impedance sections on the hybrid coupler. The simulated results of the respective sections are presented in this paper. The scattering matrix of the cascaded 4-port microstrip FCL circulator is predicted using a power flow diagram.
{"title":"4-port Microstrip Ferrite Coupled-Line Circulator","authors":"Cham Kiong Queck, L. Davis","doi":"10.1109/EUMA.2001.339072","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339072","url":null,"abstract":"A 4-port microstrip Ferrite Coupled-Line (FCL) circulator is designed at 11.4 GHz by cascading a longitudinally-magnetized FCL structure with a 180° hybrid coupler. A broadband 180° hybrid ring with a bandwidth of approximately 7 GHz is realised by employing stepped impedance sections on the hybrid coupler. The simulated results of the respective sections are presented in this paper. The scattering matrix of the cascaded 4-port microstrip FCL circulator is predicted using a power flow diagram.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"21 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":"126889923","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.2001.339164
N. Siripon, M. Chongcheawchamnan, I. Robertson
A novel sub-harmonic injection-locked balanced oscillator is proposed. The circuit provides two outputs with a 180° phase difference by employing a transmission line section for impedance transformation to meet the oscillation conditions. A coupling network is connected at the mid-point of the transmission line to inject the sub-harmonic frequency. This eliminates the need for a circulator or balun. The circuit is small and consumes low DC power. Under the locking state, the circuit provides double the injection frequency and also the phase noise of the two outputs is substantially improved.
{"title":"Novel Sub-Harmonic Injection-Locked Balanced Oscillator","authors":"N. Siripon, M. Chongcheawchamnan, I. Robertson","doi":"10.1109/EUMA.2001.339164","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339164","url":null,"abstract":"A novel sub-harmonic injection-locked balanced oscillator is proposed. The circuit provides two outputs with a 180° phase difference by employing a transmission line section for impedance transformation to meet the oscillation conditions. A coupling network is connected at the mid-point of the transmission line to inject the sub-harmonic frequency. This eliminates the need for a circulator or balun. The circuit is small and consumes low DC power. Under the locking state, the circuit provides double the injection frequency and also the phase noise of the two outputs is substantially improved.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"29 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":"126509956","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.2001.338905
M. Zheng, H. J. Shapter
A compact Planar Inverted-F Antenna (PIFA) with a coplanar parasitic element for WCDMA mobile communication handset terminals is presented. The antenna has small size, good radiation performance, minimal degradation of performance caused by user proximity, wide bandwidth and two unique close resonant frequencies that are ideally suited for Frequency Division Duplex (FDD) WCDMA systems with a 190MHz-frequency separation.
{"title":"Low-profile WCDMA Internal Antenna","authors":"M. Zheng, H. J. Shapter","doi":"10.1109/EUMA.2001.338905","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338905","url":null,"abstract":"A compact Planar Inverted-F Antenna (PIFA) with a coplanar parasitic element for WCDMA mobile communication handset terminals is presented. The antenna has small size, good radiation performance, minimal degradation of performance caused by user proximity, wide bandwidth and two unique close resonant frequencies that are ideally suited for Frequency Division Duplex (FDD) WCDMA systems with a 190MHz-frequency separation.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"69 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":"116753212","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.2001.339103
J. Vrba, G. Saliba, L. Oppl, R. Chovanec, I. Zuna, P. Peschke, L. Pousek, P. Novák
Microwave thermotherapy is being used in medicine for the cancer treatment and treatment of some other diseases since early eighties [1,2,3,4]. Until now in temperature monitoring and control there is a lack of non-invasive 3D thermometry system, e. g. either Nuclear Magnetic Resonance (NMR) or ultrasound (US). The goal of this paper is to describe design and experimental evaluation of a new type applicator for microwave thermotherapy, which will be compatible with NMR. The first applicator of this type is just being used for a hyperthermia treatment of the experimentally induced pedicle tumours of the rat.
{"title":"Hyperthermia Applicator Compatible with \"NMR\"","authors":"J. Vrba, G. Saliba, L. Oppl, R. Chovanec, I. Zuna, P. Peschke, L. Pousek, P. Novák","doi":"10.1109/EUMA.2001.339103","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339103","url":null,"abstract":"Microwave thermotherapy is being used in medicine for the cancer treatment and treatment of some other diseases since early eighties [1,2,3,4]. Until now in temperature monitoring and control there is a lack of non-invasive 3D thermometry system, e. g. either Nuclear Magnetic Resonance (NMR) or ultrasound (US). The goal of this paper is to describe design and experimental evaluation of a new type applicator for microwave thermotherapy, which will be compatible with NMR. The first applicator of this type is just being used for a hyperthermia treatment of the experimentally induced pedicle tumours of the rat.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"60 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":"122667348","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.2001.338994
Y. Chen, Ching-Kuang C. Tzuang
Rigorous full-wave modal analyses of a uniform microstrip on a UC-PBG ground plane are presented. Brillouin diagram clearly depicts various types of modes propagating in the UC-PBG structure, namely, forward and backward traveling waves in the passbands, and complex waves in the stopband. Oscillatory behavior of the complex waves is reported and discussed. The theoretical results also successfully explain formation of two passbands and its stopband in between.
{"title":"Fields and Waves in Microstrip on Uniplanar Compact Photonic-Bandgap (UC-PBG) Ground Plane","authors":"Y. Chen, Ching-Kuang C. Tzuang","doi":"10.1109/EUMA.2001.338994","DOIUrl":"https://doi.org/10.1109/EUMA.2001.338994","url":null,"abstract":"Rigorous full-wave modal analyses of a uniform microstrip on a UC-PBG ground plane are presented. Brillouin diagram clearly depicts various types of modes propagating in the UC-PBG structure, namely, forward and backward traveling waves in the passbands, and complex waves in the stopband. Oscillatory behavior of the complex waves is reported and discussed. The theoretical results also successfully explain formation of two passbands and its stopband in between.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"49 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":"122788694","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.2001.339061
V. Sherman, K. Astafiev, A. Tagantsev, N. Setter, I. Vendik, O. Vendik
A reflection type phase shifter based on a tunable ferroelectric capacitor is under consideration. A design and characteristics of the one-bit ferroelectric phase shifter is proposed and discussed. The minimal insertion loss of the phase shifter is limited by the commutation quality factor of the capacitor and can be achieved in the case when the losses of the phase shifter in both states have the same value. The layout of the phase shifter based on a coplanar waveguide structure is shown. Measured characteristics of the phase shifter are compared with the predicted ones.
{"title":"Design and Investigation of Ferroelectric Digital Phase Shifter","authors":"V. Sherman, K. Astafiev, A. Tagantsev, N. Setter, I. Vendik, O. Vendik","doi":"10.1109/EUMA.2001.339061","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339061","url":null,"abstract":"A reflection type phase shifter based on a tunable ferroelectric capacitor is under consideration. A design and characteristics of the one-bit ferroelectric phase shifter is proposed and discussed. The minimal insertion loss of the phase shifter is limited by the commutation quality factor of the capacitor and can be achieved in the case when the losses of the phase shifter in both states have the same value. The layout of the phase shifter based on a coplanar waveguide structure is shown. Measured characteristics of the phase shifter are compared with the predicted ones.","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":"133162451","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.2001.339116
J. K. Kim, H. J. Lee, H. S. Oh
In this paper, the wideband microstrip antennas for the PCS & IMT-2000 dual band are studied. Experimental and simulation results on the dual band antenna are presented. Simulation results are in good agreement with measurements. The experimental and simulation results confirm the wideband characteristics of the antenna. The studied antenna satisfied the wideband characteristics that are required characteristics for above 420MHz impedance bandwidth for the PCS & IMT-2000 dual band antenna. In this paper, through the designing of a dual band antenna, we have presented the availability for PCS & IMT-2000 base station antenna.
{"title":"Design of electromagnetically coupled patch array with u-slot","authors":"J. K. Kim, H. J. Lee, H. S. Oh","doi":"10.1109/EUMA.2001.339116","DOIUrl":"https://doi.org/10.1109/EUMA.2001.339116","url":null,"abstract":"In this paper, the wideband microstrip antennas for the PCS & IMT-2000 dual band are studied. Experimental and simulation results on the dual band antenna are presented. Simulation results are in good agreement with measurements. The experimental and simulation results confirm the wideband characteristics of the antenna. The studied antenna satisfied the wideband characteristics that are required characteristics for above 420MHz impedance bandwidth for the PCS & IMT-2000 dual band antenna. In this paper, through the designing of a dual band antenna, we have presented the availability for PCS & IMT-2000 base station antenna.","PeriodicalId":207696,"journal":{"name":"2001 31st European Microwave Conference","volume":"13 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":"133674839","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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