Pub Date : 2007-04-18DOI: 10.1109/ICMMT.2007.381369
Xiao Chun-lai, Yang Li
The modes supported in air-core Bragg fibers are modeled and simulated by using a full-vectorial 1-Dimensional finite-difference frequency-domain method (FDFD). A perfectly matched layer (PML) terminated by a zero boundary condition is applied as numerical absorption boundary condition such that with proper PML parameters, three types of modes are well defined and divided into branches in the mode spectrum. The three types of modes can be identified as quasi-guided modes, mainly depending on Bragg fiber properties; leaky modes, having tricky relationship with the parameters of both Bragg fiber and PML; and PML modes, mainly depending on the parameters of PML.
{"title":"Modes in Air-core Bragg Fibers","authors":"Xiao Chun-lai, Yang Li","doi":"10.1109/ICMMT.2007.381369","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381369","url":null,"abstract":"The modes supported in air-core Bragg fibers are modeled and simulated by using a full-vectorial 1-Dimensional finite-difference frequency-domain method (FDFD). A perfectly matched layer (PML) terminated by a zero boundary condition is applied as numerical absorption boundary condition such that with proper PML parameters, three types of modes are well defined and divided into branches in the mode spectrum. The three types of modes can be identified as quasi-guided modes, mainly depending on Bragg fiber properties; leaky modes, having tricky relationship with the parameters of both Bragg fiber and PML; and PML modes, mainly depending on the parameters of PML.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116643091","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381411
Wang Peng, Hao Qing, Wang Jian, Chen Yaqin
Low noise amplifier with switch can effectively solve the problem of the high level and the wide dynamic rang of the input signal in communication systems. This paper presents two types of C-band microstrip LNA circuits with switches. Both using two stages of amplifier and microstrip matching networks, one circuit realizes the adjustable gain about -4 dB to 19 dB, a gain deviation about ldB, noise figure less than 1.6 dB and the work bandwidth over 200 MHz; the other realizes the adjustable gain about -6 dB to 29 dB, max input power about 23 dBm, noise figure less than 1.5 dB, the max gain about 29 dB at 5.25 GHz, a gain deviation about ldB and the work bandwidth over 200 MHz. Additionally, comparisons between these two circuits and between the simulated and measured results are also presented.
{"title":"Design of C-band Low Noise Amplifier with Switch","authors":"Wang Peng, Hao Qing, Wang Jian, Chen Yaqin","doi":"10.1109/ICMMT.2007.381411","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381411","url":null,"abstract":"Low noise amplifier with switch can effectively solve the problem of the high level and the wide dynamic rang of the input signal in communication systems. This paper presents two types of C-band microstrip LNA circuits with switches. Both using two stages of amplifier and microstrip matching networks, one circuit realizes the adjustable gain about -4 dB to 19 dB, a gain deviation about ldB, noise figure less than 1.6 dB and the work bandwidth over 200 MHz; the other realizes the adjustable gain about -6 dB to 29 dB, max input power about 23 dBm, noise figure less than 1.5 dB, the max gain about 29 dB at 5.25 GHz, a gain deviation about ldB and the work bandwidth over 200 MHz. Additionally, comparisons between these two circuits and between the simulated and measured results are also presented.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"117 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120840650","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381290
J. Qiu, Bo Zhao, Lingling Zhong
This paper propose a new kind of circular polarization antenna, i.e. CPA , composed of fold crossed dipole. The fold dipoles are vertical in space, and there is 90 degree phase difference between their feeding current. With the software CST Microwave StudioR , we conclude that there is almost no difference between fold and non-fold crossed dipole about their properties, except their size, the size of fold crossed dipole is about 50% of non-fold crossed dipole.
{"title":"A Kind of New Minimize Technology of Circular Polarization Antenna","authors":"J. Qiu, Bo Zhao, Lingling Zhong","doi":"10.1109/ICMMT.2007.381290","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381290","url":null,"abstract":"This paper propose a new kind of circular polarization antenna, i.e. CPA , composed of fold crossed dipole. The fold dipoles are vertical in space, and there is 90 degree phase difference between their feeding current. With the software CST Microwave StudioR , we conclude that there is almost no difference between fold and non-fold crossed dipole about their properties, except their size, the size of fold crossed dipole is about 50% of non-fold crossed dipole.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125942744","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381279
R. Karthikkumar, A. Sudha, N. Gunasekaran
This paper employs the Modified Taylor Distribution to achieve individual sidelobe control and signal to interference and noise ratio improvement with simultaneous main beam steering and sidelobe nulling . An adaptive array antenna element designed for beamforming application has been modeled and analyzed.
{"title":"Design and Analysis of Modified Taylor Distributed Adaptive Beamforming Array Element","authors":"R. Karthikkumar, A. Sudha, N. Gunasekaran","doi":"10.1109/ICMMT.2007.381279","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381279","url":null,"abstract":"This paper employs the Modified Taylor Distribution to achieve individual sidelobe control and signal to interference and noise ratio improvement with simultaneous main beam steering and sidelobe nulling . An adaptive array antenna element designed for beamforming application has been modeled and analyzed.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125390746","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381302
Yang Fang, Guo Chen-jiang, Xu Jia-dong, Xie Chun-jian, Ding You-jun
A four-arm conical spiral antenna with arbitrary configuration and excited by different modes is analyzed by the method of moments. Both Archimedean and equiangular spiral antennas are unified in its coordinate equation. The results show that backfire and endure shaped-conical beams can be obtained by different exciting types. The relationship between its radiation characteristics and winding denseness as well as its feeding modes is discussed. With the increase of the winding denseness the beam deviation from the axis augments while its beam conformity deteriorates. To get the best radiation performance, an octo-filar spiral antenna that can generate backfire radiation patterns is proposed.
{"title":"Backfire/Endfire conical beam properties of conical spiral antennas with arbitrary configurations","authors":"Yang Fang, Guo Chen-jiang, Xu Jia-dong, Xie Chun-jian, Ding You-jun","doi":"10.1109/ICMMT.2007.381302","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381302","url":null,"abstract":"A four-arm conical spiral antenna with arbitrary configuration and excited by different modes is analyzed by the method of moments. Both Archimedean and equiangular spiral antennas are unified in its coordinate equation. The results show that backfire and endure shaped-conical beams can be obtained by different exciting types. The relationship between its radiation characteristics and winding denseness as well as its feeding modes is discussed. With the increase of the winding denseness the beam deviation from the axis augments while its beam conformity deteriorates. To get the best radiation performance, an octo-filar spiral antenna that can generate backfire radiation patterns is proposed.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116409862","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381281
Minggang Liu, Zhenghe Feng
Base on the classic REV method, a new combined REV method is proposed for the calibration of large-scale phase array. Different from the classical method, the new method synchronously alters the phases of a group of elements by their phaseshifters. When this method is used in nearfield calibration, the signal-to-noise ratio is improved and the dynamic range of the signal is limited, and higher precision could be achieved.
{"title":"Combined Rotating-element Electric-field Vector (CREV) Method for nearfield Calibration of Phased Array Antenna","authors":"Minggang Liu, Zhenghe Feng","doi":"10.1109/ICMMT.2007.381281","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381281","url":null,"abstract":"Base on the classic REV method, a new combined REV method is proposed for the calibration of large-scale phase array. Different from the classical method, the new method synchronously alters the phases of a group of elements by their phaseshifters. When this method is used in nearfield calibration, the signal-to-noise ratio is improved and the dynamic range of the signal is limited, and higher precision could be achieved.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122678835","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381461
Jiwen Zhu, Zhenghe Feng
The use of radial stubs in microstrip stepped-impedance resonator bandpass filters is investigated. It is noticed that the stopband rejection level can be enhanced with minor deterioration in the filter's passband characteristics. Demonstration filters were fabricated with the measured and simulated results presented.
{"title":"Enhancement of Stopband Rejection of Microstrip Bandpass Filters by Radial Stubs","authors":"Jiwen Zhu, Zhenghe Feng","doi":"10.1109/ICMMT.2007.381461","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381461","url":null,"abstract":"The use of radial stubs in microstrip stepped-impedance resonator bandpass filters is investigated. It is noticed that the stopband rejection level can be enhanced with minor deterioration in the filter's passband characteristics. Demonstration filters were fabricated with the measured and simulated results presented.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122749802","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381491
Daiying Zhou
A novel subspace method of radar target recognition, which is named as kernel projection subspace (KPS) method, is proposed in this paper, in which geometric relations are preserved according to prior class-label information and nonlinear variations of range profiles are represented by nonlinear mapping. So, the KPS can be used to extract target feature for enhancing local within-class relations. The experimental results of four kinds of planes demonstrate the efficiency of approach proposed in this paper.
{"title":"Recognition of Radar Target Based on Kernel Projection Subspace using Range Profiles","authors":"Daiying Zhou","doi":"10.1109/ICMMT.2007.381491","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381491","url":null,"abstract":"A novel subspace method of radar target recognition, which is named as kernel projection subspace (KPS) method, is proposed in this paper, in which geometric relations are preserved according to prior class-label information and nonlinear variations of range profiles are represented by nonlinear mapping. So, the KPS can be used to extract target feature for enhancing local within-class relations. The experimental results of four kinds of planes demonstrate the efficiency of approach proposed in this paper.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122061763","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381465
Wanchun Tang, Baozheng Jiang, Xuemei Chen, Y. Chow
This paper derives simple computer-aided design (CAD) formulas of the components of silicon based radio frequency integrated circuits (Si-RFIC) by synthetic asymptote. The formulas include those for microstrip line, patch capacitor, and spiral inductor. These formulas are simple, accurate, with good physical insights and few arbitrary constants. Compared with numerical solutions, the average errors are less than 2%.
{"title":"Improved CAD Formulas of Silicon Based RFIC Components by Synthetic Asymptote with Physical Insights","authors":"Wanchun Tang, Baozheng Jiang, Xuemei Chen, Y. Chow","doi":"10.1109/ICMMT.2007.381465","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381465","url":null,"abstract":"This paper derives simple computer-aided design (CAD) formulas of the components of silicon based radio frequency integrated circuits (Si-RFIC) by synthetic asymptote. The formulas include those for microstrip line, patch capacitor, and spiral inductor. These formulas are simple, accurate, with good physical insights and few arbitrary constants. Compared with numerical solutions, the average errors are less than 2%.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"598 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123328936","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381289
H. Elkamchouchi, M. Nasr
A multiband and wideband 3D-ordinary and reversed fractal Hilbert antennas made of flat conducting plates are introduced. The proposed antennas have acceptable antenna gain. The finite element method (FEM) is used to obtain the radiation characteristics, return loss, input impedance, gain and radiation patterns. The obtained impedance bandwidths cover the required bandwidth of DCS (1710-1880 MHz), PSC (1850-1990 MHz), UMTS (1920-2170MHz) , Bluetooth bands and wireless local area network (WLAN) applications.
{"title":"3D-Fractal Hilbert Antennas Made of Conducting Plates","authors":"H. Elkamchouchi, M. Nasr","doi":"10.1109/ICMMT.2007.381289","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381289","url":null,"abstract":"A multiband and wideband 3D-ordinary and reversed fractal Hilbert antennas made of flat conducting plates are introduced. The proposed antennas have acceptable antenna gain. The finite element method (FEM) is used to obtain the radiation characteristics, return loss, input impedance, gain and radiation patterns. The obtained impedance bandwidths cover the required bandwidth of DCS (1710-1880 MHz), PSC (1850-1990 MHz), UMTS (1920-2170MHz) , Bluetooth bands and wireless local area network (WLAN) applications.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114312784","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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