Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276649
Dong Tao, Xu Xiao-wen, Xiao Jiang
The reflector antenna distortion model is built by explosion test results. The radiation characteristics of a kind of distorted shaped reflector antenna are computed by using PTD method, and the radiation characteristics of the reflector antenna with holes on the surface are also computed. Good results are achieved, which can provide theoretical guidance for the radar attackers.
{"title":"Analysis of the radiation characteristics of the reflector antenna with surface distortion and holes using PTD","authors":"Dong Tao, Xu Xiao-wen, Xiao Jiang","doi":"10.1109/ISAPE.2003.1276649","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276649","url":null,"abstract":"The reflector antenna distortion model is built by explosion test results. The radiation characteristics of a kind of distorted shaped reflector antenna are computed by using PTD method, and the radiation characteristics of the reflector antenna with holes on the surface are also computed. Good results are achieved, which can provide theoretical guidance for the radar attackers.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125164603","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276812
A. Butrym, Zheng Yu, O. Tretyakov
The paper is dealt with pulse wave propagation in a waveguide uniformly loaded with lossy medium. Maxwell's equations are solved directly in time-domain by modal basis method [O.A. Tretyakov, 1989, 1993, 2002]. Electromagnetic fields of the time-domain modes are products of some functions of the transverse waveguide coordinates, which originate the modal basis, and the modal amplitudes, which are some functions of axial coordinate z and time t. Modal amplitudes are governed by evolutionary equations which can be reduced to the Klein-Gordon's equation. The solution to this equation is written in the integral form. The energy flow is under study. Some diagrams with space-time distributions of energy density and energy flow speed are plotted for Lagerr impulse wave propagation.
{"title":"Energy flow in lossy waveguides for impulse wave propagation","authors":"A. Butrym, Zheng Yu, O. Tretyakov","doi":"10.1109/ISAPE.2003.1276812","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276812","url":null,"abstract":"The paper is dealt with pulse wave propagation in a waveguide uniformly loaded with lossy medium. Maxwell's equations are solved directly in time-domain by modal basis method [O.A. Tretyakov, 1989, 1993, 2002]. Electromagnetic fields of the time-domain modes are products of some functions of the transverse waveguide coordinates, which originate the modal basis, and the modal amplitudes, which are some functions of axial coordinate z and time t. Modal amplitudes are governed by evolutionary equations which can be reduced to the Klein-Gordon's equation. The solution to this equation is written in the integral form. The energy flow is under study. Some diagrams with space-time distributions of energy density and energy flow speed are plotted for Lagerr impulse wave propagation.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129844653","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276802
Qin Zhi-an, Zhong Hai-yang
A new method for solving Maxwell equations of electromagnetic field in chiral media is presented. By using this method, the problem of solving the non-divergence electromagnetic field in chiral media can be transformed into the problem for solving a scalar equation.
{"title":"An approach for solving maxwell equations of electromagnetic field in chiral media","authors":"Qin Zhi-an, Zhong Hai-yang","doi":"10.1109/ISAPE.2003.1276802","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276802","url":null,"abstract":"A new method for solving Maxwell equations of electromagnetic field in chiral media is presented. By using this method, the problem of solving the non-divergence electromagnetic field in chiral media can be transformed into the problem for solving a scalar equation.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129872580","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276721
T. Sengor
Surface currents induced by high-frequency whispering gallery waves on a spherically curved impedance sheet having different impedance faces are obtained. The influences of several diffraction phenomena on surface currents are given explicitly. The causes and forms of surface currents are described, and the scattered fields are determined from those currents. The results explain the contribution of surface currents to the scattered field in a quite simple form. When the impedance tends to zero the expressions reduce to those of the perfectly conducting sheet. The results are independent of the actual source configuration and applicable to more complicated scattering and inverse scattering phenomena.
{"title":"Surface currents and diffraction of whispering gallery modes by a spherical impedance cap","authors":"T. Sengor","doi":"10.1109/ISAPE.2003.1276721","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276721","url":null,"abstract":"Surface currents induced by high-frequency whispering gallery waves on a spherically curved impedance sheet having different impedance faces are obtained. The influences of several diffraction phenomena on surface currents are given explicitly. The causes and forms of surface currents are described, and the scattered fields are determined from those currents. The results explain the contribution of surface currents to the scattered field in a quite simple form. When the impedance tends to zero the expressions reduce to those of the perfectly conducting sheet. The results are independent of the actual source configuration and applicable to more complicated scattering and inverse scattering phenomena.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123780378","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276623
Zhu Xiang-qin, Ge De-biao, Wu Yue-li
To analyze the radiation of a monopole covered with plasma, a shift operator method in FDTD is applied. By using this scheme we compute the radiation of a monopole antenna with the coverage of plasma. We observe from the numerical results that the plasma can greatly absorb electromagnetic waves and can impede the Gaussian pulse travelling along the antenna. In addition, the high frequency components in the radiation fields are decreased, and the resonant frequencies are shifted.
{"title":"FDTD analysis of radiation from monopole antenna with plasma coating","authors":"Zhu Xiang-qin, Ge De-biao, Wu Yue-li","doi":"10.1109/ISAPE.2003.1276623","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276623","url":null,"abstract":"To analyze the radiation of a monopole covered with plasma, a shift operator method in FDTD is applied. By using this scheme we compute the radiation of a monopole antenna with the coverage of plasma. We observe from the numerical results that the plasma can greatly absorb electromagnetic waves and can impede the Gaussian pulse travelling along the antenna. In addition, the high frequency components in the radiation fields are decreased, and the resonant frequencies are shifted.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127701787","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276754
R. Sen, M.P. Singh
In this paper an attempt has been made to compute cross polarization of millimeter waves in the 30-35 GHz frequency range due to rain. Assuming Laws and Parson's [Laws JO and Parsons DA, 1943] drop size distributions for oblate spheroid drops at 20 /spl deg/C ITU-R method [ITU-R, 1990] has been used to predict depolarization (XPD) for circular polarization. The study includes a number of earth stations in a temperate country like India, namely, Allahabad, Ahmadabad, Bangalore, Calcutta, Delhi, Gangtok, Jodhpur, Madras, Nagpur and Trivandrum. Variations of co-polar attenuation with XPD ha been shown. Cumulative time distribution of XPD has also been presented. The study reveals that cross polarization depends on frequency, path elevation angle, co-polar attenuation and rainfall rate.
本文尝试计算30 ~ 35ghz频率范围内毫米波在降雨作用下的交叉极化。假设Laws和Parson的[Laws JO和Parsons DA, 1943]在20 /spl度/C下扁球体液滴的尺寸分布ITU-R方法[ITU-R, 1990]已被用于预测圆极化的去极化(XPD)。这项研究包括设在象印度这样的温带国家的若干地面站，即阿拉哈巴德、艾哈迈达巴德、班加罗尔、加尔各答、德里、甘托克、焦特布尔、马德拉斯、那格浦尔和特里凡得琅。共极性衰减随XPD的变化。给出了XPD的累积时间分布。研究表明，交叉极化与频率、路径仰角、共极衰减和降雨速率有关。
{"title":"Estimation of cross polarization of millimeter waves due to rain over few stations in India and its modification incorporating measured values of rain height","authors":"R. Sen, M.P. Singh","doi":"10.1109/ISAPE.2003.1276754","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276754","url":null,"abstract":"In this paper an attempt has been made to compute cross polarization of millimeter waves in the 30-35 GHz frequency range due to rain. Assuming Laws and Parson's [Laws JO and Parsons DA, 1943] drop size distributions for oblate spheroid drops at 20 /spl deg/C ITU-R method [ITU-R, 1990] has been used to predict depolarization (XPD) for circular polarization. The study includes a number of earth stations in a temperate country like India, namely, Allahabad, Ahmadabad, Bangalore, Calcutta, Delhi, Gangtok, Jodhpur, Madras, Nagpur and Trivandrum. Variations of co-polar attenuation with XPD ha been shown. Cumulative time distribution of XPD has also been presented. The study reveals that cross polarization depends on frequency, path elevation angle, co-polar attenuation and rainfall rate.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122017739","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276669
Z. Xiaofei, Xu Dazhuan
The antenna array characteristics like sensor location, gain and phase response are rarely perfectly known in realistic situations. Self-calibration algorithms estimate both source DOAs and perturbed array response vector parameters simultaneously. In this paper calibration errors are usually assumed Io be small and a first order approximation to the perturbed array response vector is often used to simplify the estimation procedure. We introduce two classes of self-calibration algorithms for solving the sensor location error problem. This paper investigates the performance of these algorithms. Simulation results show that iterative approach and MAP-NSF algorithm are much better than MUSIC algorithm, and the iterative approach is preferred. But the iterative approach is very sensitive to initialization. A novel algorithm, using the MAP-NSF algorithm results as the input to the iterative approach, is proposed to eliminate sensor location errors and remove the sensitivity to initialization. Further simulation results demonstrate the improved performance of the new approach.
{"title":"Antenna array self-calibration algorithm with sensor location errors","authors":"Z. Xiaofei, Xu Dazhuan","doi":"10.1109/ISAPE.2003.1276669","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276669","url":null,"abstract":"The antenna array characteristics like sensor location, gain and phase response are rarely perfectly known in realistic situations. Self-calibration algorithms estimate both source DOAs and perturbed array response vector parameters simultaneously. In this paper calibration errors are usually assumed Io be small and a first order approximation to the perturbed array response vector is often used to simplify the estimation procedure. We introduce two classes of self-calibration algorithms for solving the sensor location error problem. This paper investigates the performance of these algorithms. Simulation results show that iterative approach and MAP-NSF algorithm are much better than MUSIC algorithm, and the iterative approach is preferred. But the iterative approach is very sensitive to initialization. A novel algorithm, using the MAP-NSF algorithm results as the input to the iterative approach, is proposed to eliminate sensor location errors and remove the sensitivity to initialization. Further simulation results demonstrate the improved performance of the new approach.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129117153","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276711
Jin Yongqi, H. Guoyu, X. Ding
In this paper is presented a new technique to improve the VCO linearity by resampling the measured IF signal in short-range frequency modulated continuous wave (FM/CW) radar based on a known reflecting reference, which caused intentionally by a specially fabricated paraboloidal antenna. The basic principle and special attention are given in following discussion. Moreover, a confirmed experiment in microwave non-reflective chamber is simulated. The result shows the feasibility of our self-made antenna and this method satisfactorily.
{"title":"A new realizable technique to improve the VCO linearity","authors":"Jin Yongqi, H. Guoyu, X. Ding","doi":"10.1109/ISAPE.2003.1276711","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276711","url":null,"abstract":"In this paper is presented a new technique to improve the VCO linearity by resampling the measured IF signal in short-range frequency modulated continuous wave (FM/CW) radar based on a known reflecting reference, which caused intentionally by a specially fabricated paraboloidal antenna. The basic principle and special attention are given in following discussion. Moreover, a confirmed experiment in microwave non-reflective chamber is simulated. The result shows the feasibility of our self-made antenna and this method satisfactorily.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122222502","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276726
Jin Ming, Qiao Xiaolin, Zhao Yinan, Jia Shilou
Angular glint caused by a target of dual point sources is discussed in phase gradient method. Deterministic relation between phase gradient and RCS is deduced. On the basis of that, a RCS based compensation method of angular glint is presented. The validity is verified by simulation. For target of multi-point sources, compensation for angular glint error is similar if it is treated as a target of dual point sources.
{"title":"Analyses and compensation for radar target angular glint","authors":"Jin Ming, Qiao Xiaolin, Zhao Yinan, Jia Shilou","doi":"10.1109/ISAPE.2003.1276726","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276726","url":null,"abstract":"Angular glint caused by a target of dual point sources is discussed in phase gradient method. Deterministic relation between phase gradient and RCS is deduced. On the basis of that, a RCS based compensation method of angular glint is presented. The validity is verified by simulation. For target of multi-point sources, compensation for angular glint error is similar if it is treated as a target of dual point sources.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116616797","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276671
Ling-Ling Wang, D. Fang
An approach based on a combination of genetic algorithm and fast Fourier transform is presented for array failure correction. It speeds up the evaluation of array pattern by using FFT, so it provides the possibility to speed up the GA. Simulation results demonstrate its effectiveness.
{"title":"Combination of genetic algorithm and fast Fourier transform for array failure correction","authors":"Ling-Ling Wang, D. Fang","doi":"10.1109/ISAPE.2003.1276671","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276671","url":null,"abstract":"An approach based on a combination of genetic algorithm and fast Fourier transform is presented for array failure correction. It speeds up the evaluation of array pattern by using FFT, so it provides the possibility to speed up the GA. Simulation results demonstrate its effectiveness.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116686095","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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