Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276625
W. Ali
An experimental investigation is presented on the impedance bandwidth of an electromagnetically coupled, probe-fed square microstrip patch antenna with suspended parasitic. A bandwidth of 25.5 % is achieved around a center frequency of 5.441 GHz. Measurements on gain and patterns are also presented. The antenna presented is small in the overall size, i.e. 55 mm * 55 mm, and suitable for use in planar and conformal arrays. It could find application in the industrial, scientific and medical (TSM) frequency band as well as in the 3G wireless local area network.
实验研究了悬浮寄生式电磁耦合探针馈电方形微带贴片天线的阻抗带宽。在5.441 GHz的中心频率附近实现了25.5%的带宽。还介绍了增益和模式的测量。该天线整体尺寸较小，为55 mm * 55 mm，适用于平面和共形阵列。它可以在工业、科学和医疗(TSM)频段以及3G无线局域网中找到应用。
{"title":"Broadband square microstrip patch antenna with suspended parasitic element","authors":"W. Ali","doi":"10.1109/ISAPE.2003.1276625","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276625","url":null,"abstract":"An experimental investigation is presented on the impedance bandwidth of an electromagnetically coupled, probe-fed square microstrip patch antenna with suspended parasitic. A bandwidth of 25.5 % is achieved around a center frequency of 5.441 GHz. Measurements on gain and patterns are also presented. The antenna presented is small in the overall size, i.e. 55 mm * 55 mm, and suitable for use in planar and conformal arrays. It could find application in the industrial, scientific and medical (TSM) frequency band as well as in the 3G wireless local area network.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116243621","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.2003.1276734
Chunhua Yang, Huaibei Zhou
In this paper, a vector synthesis method is proposed to analyze the scattering by a composite system of a target with rough surface: specifically, the multi-path scattering has been investigated. The results from the direct target scattering have been compared with the composite system scattering to illustrate the characteristics of multi-path scattering. The simulation results have demonstrated some interesting results.
{"title":"The study of electromagnetic scattering by a target with fractal rough surface","authors":"Chunhua Yang, Huaibei Zhou","doi":"10.1109/ISAPE.2003.1276734","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276734","url":null,"abstract":"In this paper, a vector synthesis method is proposed to analyze the scattering by a composite system of a target with rough surface: specifically, the multi-path scattering has been investigated. The results from the direct target scattering have been compared with the composite system scattering to illustrate the characteristics of multi-path scattering. The simulation results have demonstrated some interesting results.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121724900","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.2003.1276720
Tang Song, Liu Qi-zhong
The facet noise in RCS prediction is studied in this paper. Faster speed of computation and higher accuracy is obtained with a proper facet model build. The number of facets needed to model a target increases with the size of the target and the frequency of the incident wave. The criterion of facetization is discussed and some helpful results are obtained.
{"title":"Facet noise in RCS prediction","authors":"Tang Song, Liu Qi-zhong","doi":"10.1109/ISAPE.2003.1276720","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276720","url":null,"abstract":"The facet noise in RCS prediction is studied in this paper. Faster speed of computation and higher accuracy is obtained with a proper facet model build. The number of facets needed to model a target increases with the size of the target and the frequency of the incident wave. The criterion of facetization is discussed and some helpful results are obtained.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125134463","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.2003.1276723
W. Ewe, Lewei Li, M. Leong
This paper presents the adaptive integral method (AIM) to solve scattering problem of mixed dielectric/conducting object. The scattering problem is formulated using the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) and electric field integral equation approach for the dielectric and conducting body respectively. The integral equations using these approaches eliminate the interior resonance and produce accurate result. Method of moments (MOM) apply to discretize the integral equations. The resultant matrix system is solved by iterative solver with AIM. Numerical results are presented to demonstrate the accuracy and efficiency of the technique.
{"title":"Solution to scattering problem of composite conducting/dielectric body using adaptive integral method","authors":"W. Ewe, Lewei Li, M. Leong","doi":"10.1109/ISAPE.2003.1276723","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276723","url":null,"abstract":"This paper presents the adaptive integral method (AIM) to solve scattering problem of mixed dielectric/conducting object. The scattering problem is formulated using the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) and electric field integral equation approach for the dielectric and conducting body respectively. The integral equations using these approaches eliminate the interior resonance and produce accurate result. Method of moments (MOM) apply to discretize the integral equations. The resultant matrix system is solved by iterative solver with AIM. Numerical results are presented to demonstrate the accuracy and efficiency of the technique.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131274472","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.2003.1276746
Lu Xun, Hou De-tin, Zhou Dong-fang, Niu Zhong-xia, Wang Yu-guang, Li Shi-zheng
In this paper, air breakdown by high power microwave pulse is modeled using the parameters between electrons and air neutral molecules. When high power microwave (HPM) pulse propagates in self-generated plasma, the influence of plasma can't be omitted.
{"title":"Research on high power microwave pulse in the air breakdown","authors":"Lu Xun, Hou De-tin, Zhou Dong-fang, Niu Zhong-xia, Wang Yu-guang, Li Shi-zheng","doi":"10.1109/ISAPE.2003.1276746","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276746","url":null,"abstract":"In this paper, air breakdown by high power microwave pulse is modeled using the parameters between electrons and air neutral molecules. When high power microwave (HPM) pulse propagates in self-generated plasma, the influence of plasma can't be omitted.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131360665","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.2003.1276675
Yi Zhan, Qiang Chen, Zewei Zhang
This paper describes a small uniform circular array (UCA) designed for super-resolution direction finding and spatial signal separation. The experiment results with the UCA reveal there are considerable differences on accuracy, resolution capacity and other performances between theoretical predicted and measured results. We find array errors are the main reasons that make such differences. Several error estimation techniques are developed. Examples shown in this paper demonstrate the performances can get a great improvement after compensation. Thus, the major benefits of using such system in radio communication system are confirmed.
{"title":"An experimental study of a small signal processing array","authors":"Yi Zhan, Qiang Chen, Zewei Zhang","doi":"10.1109/ISAPE.2003.1276675","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276675","url":null,"abstract":"This paper describes a small uniform circular array (UCA) designed for super-resolution direction finding and spatial signal separation. The experiment results with the UCA reveal there are considerable differences on accuracy, resolution capacity and other performances between theoretical predicted and measured results. We find array errors are the main reasons that make such differences. Several error estimation techniques are developed. Examples shown in this paper demonstrate the performances can get a great improvement after compensation. Thus, the major benefits of using such system in radio communication system are confirmed.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127007990","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.2003.1276735
G. Lixin, Guan Xiuguo
Based on the Kirchhoff approximation for rough surface scattering and by calculating the shadowing function of the rough surface, the formula of the scattering cross section of the fractal rough surface is present with consideration of the shadowing effect. The influence of the shadowing effect on the bistatic scattering cross section for different fractal dimension and fundamental spatial frequency is discussed in detail.
{"title":"Study on the electromagnetic scattering from the fractal surface with considering the shadowing effect","authors":"G. Lixin, Guan Xiuguo","doi":"10.1109/ISAPE.2003.1276735","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276735","url":null,"abstract":"Based on the Kirchhoff approximation for rough surface scattering and by calculating the shadowing function of the rough surface, the formula of the scattering cross section of the fractal rough surface is present with consideration of the shadowing effect. The influence of the shadowing effect on the bistatic scattering cross section for different fractal dimension and fundamental spatial frequency is discussed in detail.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134283126","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.2003.1276710
H. Weidong, Sun Houjun, Lv Xin, Deng Ciping
While stealth technologies for large scale targets were researched, RCS static measurement method was adopted, which is often used under non-far field condition. Therefore a theoretical premise was deduced, and a stepped frequency pulse compression system was designed for RCS measurement, especially a novel RF channel was designed to keep the system stable. Not only the simulation but also the experimental result is presented LU the paper; at the same time, some practical difficulties are designated.
{"title":"Research on RCS measurement under non-far field condition","authors":"H. Weidong, Sun Houjun, Lv Xin, Deng Ciping","doi":"10.1109/ISAPE.2003.1276710","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276710","url":null,"abstract":"While stealth technologies for large scale targets were researched, RCS static measurement method was adopted, which is often used under non-far field condition. Therefore a theoretical premise was deduced, and a stepped frequency pulse compression system was designed for RCS measurement, especially a novel RF channel was designed to keep the system stable. Not only the simulation but also the experimental result is presented LU the paper; at the same time, some practical difficulties are designated.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133046860","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":"44 1","pages":"0"},"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.2003.1276754
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":"44 1","pages":"0"},"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}
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