IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)最新文献
In this paper, a multipoint moment-matching technique is implemented to obtain a reduced-order model solution of the electromagnetic field in hybrid systems comprising transmission lines and lumped linear circuit elements. The transmission lines and the lumped linear elements are modeled by considering a unique electromagnetic system described by the Maxwell equations in the S-domain. Accurate frequency responses of these hybrid systems are obtained by using only a few selected frequency points, thus reducing substantially the necessary computational effort.
{"title":"Reduced-order models for the field analysis of hybrid systems","authors":"L.Y. Li, L. Ciric","doi":"10.1109/APS.1999.788284","DOIUrl":"https://doi.org/10.1109/APS.1999.788284","url":null,"abstract":"In this paper, a multipoint moment-matching technique is implemented to obtain a reduced-order model solution of the electromagnetic field in hybrid systems comprising transmission lines and lumped linear circuit elements. The transmission lines and the lumped linear elements are modeled by considering a unique electromagnetic system described by the Maxwell equations in the S-domain. Accurate frequency responses of these hybrid systems are obtained by using only a few selected frequency points, thus reducing substantially the necessary computational effort.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126418578","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}
One of the most detrimental aspects of microstrip antennas despite their many advantages is narrow bandwidth. Even though numerous successful results have been reported, a bandwidth more than 20% is difficult to achieve. In this paper a new technique is introduced to increase the bandwidth of a microstrip antenna drastically using a leaky-wave concept. Experimental results are shown.
{"title":"Bandwidth enhancement of microstrip antenna with leaky-wave excitation","authors":"V. Nalbandian, C.S. Lee","doi":"10.1109/APS.1999.789534","DOIUrl":"https://doi.org/10.1109/APS.1999.789534","url":null,"abstract":"One of the most detrimental aspects of microstrip antennas despite their many advantages is narrow bandwidth. Even though numerous successful results have been reported, a bandwidth more than 20% is difficult to achieve. In this paper a new technique is introduced to increase the bandwidth of a microstrip antenna drastically using a leaky-wave concept. Experimental results are shown.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125977822","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}
A low profile antenna/pedestal system for the Milstar program was developed at Raytheon under an Air Force contract. The system was designed to have minimum intrusion inside the aircraft and no protrusion outside the aircraft so that the radome is flush to the fuselage. The main drivers of this antenna design include low cost, minimum height, and high efficiencies for both K-band (20.2-21.2 GHz) and Q-band (43.5-45.5 GHz).
{"title":"A Milstar low profile antenna","authors":"Y. Chang, M. Sarcione, F. Beltrán","doi":"10.1109/APS.1999.789230","DOIUrl":"https://doi.org/10.1109/APS.1999.789230","url":null,"abstract":"A low profile antenna/pedestal system for the Milstar program was developed at Raytheon under an Air Force contract. The system was designed to have minimum intrusion inside the aircraft and no protrusion outside the aircraft so that the radome is flush to the fuselage. The main drivers of this antenna design include low cost, minimum height, and high efficiencies for both K-band (20.2-21.2 GHz) and Q-band (43.5-45.5 GHz).","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115772906","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}
A fast integral equation formulation is implemented in conjunction with the generalised scattering matrix (GSM) to analyze waveguide-based CPW spatial power combiners. The GSM includes internal ports to account for active MMIC devices with passive circuit elements. The Kummer transformation is applied to accelerate slowly converging double series that occur in evaluating the impedance matrix elements.
{"title":"Analysis of shielded CPW spatial power combiners","authors":"A. Khalil, A. Yakovlev, M. Steer","doi":"10.1109/APS.1999.788311","DOIUrl":"https://doi.org/10.1109/APS.1999.788311","url":null,"abstract":"A fast integral equation formulation is implemented in conjunction with the generalised scattering matrix (GSM) to analyze waveguide-based CPW spatial power combiners. The GSM includes internal ports to account for active MMIC devices with passive circuit elements. The Kummer transformation is applied to accelerate slowly converging double series that occur in evaluating the impedance matrix elements.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115866241","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}
This paper describes a low-cost adaptive array system suitable for both vector channel measurements and field evaluation of array signal processing techniques. This system processes signals from four antennae with a bandwidth of 2 MHz. Low cost is achieved by sending digitised receiver output directly to the internal memory of a personal computer, as opposed to traditional architectures which use a dedicated high speed bus or interconnected DSPs. The current system acquires up to 7 seconds of data in this manner before stopping to process the data. Additional cost savings are achieved using an undersampling A/D downconverter scheme, a two stage modular downconverter which allows system operation in both VHF and L-band, and a simple passive array calibration scheme. A demonstration of the system for direction-of-arrival estimation at 220 MHz is presented. Ongoing work in developing an improved system is also presented.
{"title":"Low-cost adaptive arrays for analysis of wireless systems","authors":"S. Ellingson, H.J. Kim, K. Ayotte","doi":"10.1109/APS.1999.789505","DOIUrl":"https://doi.org/10.1109/APS.1999.789505","url":null,"abstract":"This paper describes a low-cost adaptive array system suitable for both vector channel measurements and field evaluation of array signal processing techniques. This system processes signals from four antennae with a bandwidth of 2 MHz. Low cost is achieved by sending digitised receiver output directly to the internal memory of a personal computer, as opposed to traditional architectures which use a dedicated high speed bus or interconnected DSPs. The current system acquires up to 7 seconds of data in this manner before stopping to process the data. Additional cost savings are achieved using an undersampling A/D downconverter scheme, a two stage modular downconverter which allows system operation in both VHF and L-band, and a simple passive array calibration scheme. A demonstration of the system for direction-of-arrival estimation at 220 MHz is presented. Ongoing work in developing an improved system is also presented.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131918931","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}
An adjustable "scanning mode" multifilar helical antenna with reduced frequency scanning is described. The antenna was designed for the Australian Mobile Satellite System, operating at about 1.6 GHz. The design described features a centre-fed arrangement, which is shown to substantially reduce frequency scanning in this type of antenna. A novel mechanical adjustment technique is also described, which allows the main beam of the antenna to be tilted.
{"title":"Adjustable multifilar helical antenna with reduced frequency scanning","authors":"P. E. Chadwick, R. Butland, R. Vaughan","doi":"10.1109/APS.1999.789060","DOIUrl":"https://doi.org/10.1109/APS.1999.789060","url":null,"abstract":"An adjustable \"scanning mode\" multifilar helical antenna with reduced frequency scanning is described. The antenna was designed for the Australian Mobile Satellite System, operating at about 1.6 GHz. The design described features a centre-fed arrangement, which is shown to substantially reduce frequency scanning in this type of antenna. A novel mechanical adjustment technique is also described, which allows the main beam of the antenna to be tilted.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132318266","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}
Y. Ojiro, Y. Iitsuka, H. Kawakami, G. Sato, S. Sumihiro
The characteristics of the batwing radiator, which is the heart of the superturnstile antenna system for VHF-TV broadcasting, are broad bandwidth. We investigate the modified batwing antenna for UHF used for digital terrestrial broadcasting. The characteristics of the 2-element modified batwing antenna with an infinite reflector and with a wire screen for the finite reflector are calculated by NEC-Win Pro. These antennas are connected with each element by a parallel feed line and fed at the center of this line. We estimate these antennas from 470 MHz to 770 MHz of the UHF-TV broadcasting band in Japan. The broad-band properties and the power gain of about 11 dBi are obtained in these frequencies.
{"title":"Characteristics of digital terrestrial broadcasting antennas","authors":"Y. Ojiro, Y. Iitsuka, H. Kawakami, G. Sato, S. Sumihiro","doi":"10.1109/APS.1999.788244","DOIUrl":"https://doi.org/10.1109/APS.1999.788244","url":null,"abstract":"The characteristics of the batwing radiator, which is the heart of the superturnstile antenna system for VHF-TV broadcasting, are broad bandwidth. We investigate the modified batwing antenna for UHF used for digital terrestrial broadcasting. The characteristics of the 2-element modified batwing antenna with an infinite reflector and with a wire screen for the finite reflector are calculated by NEC-Win Pro. These antennas are connected with each element by a parallel feed line and fed at the center of this line. We estimate these antennas from 470 MHz to 770 MHz of the UHF-TV broadcasting band in Japan. The broad-band properties and the power gain of about 11 dBi are obtained in these frequencies.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134251898","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}
Quasi-static characteristics of the asymmetric cylindrical coplanar waveguide (CCPW) are investigated using three different techniques: the conformal mapping method (CMM), the point matching method (PMM), and the finite difference method (FDM). The effect of various parameters on be characteristics of the CCPW is studied.
{"title":"Quasi-static analysis of asymmetric cylindrical coplanar waveguide","authors":"A. Al-Zoubi, K. Obeidat, N. Dib","doi":"10.1109/APS.1999.788310","DOIUrl":"https://doi.org/10.1109/APS.1999.788310","url":null,"abstract":"Quasi-static characteristics of the asymmetric cylindrical coplanar waveguide (CCPW) are investigated using three different techniques: the conformal mapping method (CMM), the point matching method (PMM), and the finite difference method (FDM). The effect of various parameters on be characteristics of the CCPW is studied.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126591783","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}
We have solved the transient scattering problem by a CGFFT iterative method, both in space and time. We do not need the doubling of the time interval in the conjugate gradient method described in (Tijhuis 1991). In each iteration the computational complexity is roughly of the order of MNPlog(MNP).
{"title":"A conjugate gradient FFT method for transient scattering by dielectric cylinders","authors":"R. Bloemenkamp, P. M. van den Berg","doi":"10.1109/APS.1999.789570","DOIUrl":"https://doi.org/10.1109/APS.1999.789570","url":null,"abstract":"We have solved the transient scattering problem by a CGFFT iterative method, both in space and time. We do not need the doubling of the time interval in the conjugate gradient method described in (Tijhuis 1991). In each iteration the computational complexity is roughly of the order of MNPlog(MNP).","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"149 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130817027","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}
The purpose of this study is to develop a database of measured radar cross section (RCS) values for penetrable targets and provide an example of its use for code comparisons. The material used in this research is polyethylene with a relative dielectric constant of approximately 2.3 over the frequency range of interest The target shapes include a mini-arrow and an ogive.
{"title":"Scattering from dielectric bodies","authors":"J.M. Parks, P. Collins","doi":"10.1109/APS.1999.789579","DOIUrl":"https://doi.org/10.1109/APS.1999.789579","url":null,"abstract":"The purpose of this study is to develop a database of measured radar cross section (RCS) values for penetrable targets and provide an example of its use for code comparisons. The material used in this research is polyethylene with a relative dielectric constant of approximately 2.3 over the frequency range of interest The target shapes include a mini-arrow and an ogive.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130871888","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}
IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)
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