Pub Date : 2006-10-01DOI: 10.1109/ISAPE.2006.353552
Zhong-cai Yuan, Jia-ming Shi, Jia-chun Wang
The effective-medium theory is extended to calculate the equivalent dielectric constants of hollow spheres. The Maxwell-Garnett, inverted Maxwell-Garnett, and Monecke rules are adopted to investigate the hollow ice spheres. Compared with P. Yang's paper, very different Maxwell-Garnett and inverted Maxwell-Garnett formulas but identical mean permittivity values are presented. In order to verify the validity of effective-medium theory in Mie scattering calculation of hollow dielectric spheres, n-layered Mie solution is adopted to calculate the scattering of hollow ice spheres. The mean permittivity values are used in common Mie scattering calculation of uniform sphere. By comparison, it is evident that the effective-medium theory is suitable for small size parameters. For size parameter is about ten, the effective theory is suitable for a very thin hollow ice sphere. At last, it is pointed out that the effective-medium theory make Mie scattering calculation of hollow spheres easier, and can be extended further to non-uniform and eccentric hollow spheres.
{"title":"Validity of effective-medium theory in Mie scattering calculation of hollow dielectric sphere","authors":"Zhong-cai Yuan, Jia-ming Shi, Jia-chun Wang","doi":"10.1109/ISAPE.2006.353552","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353552","url":null,"abstract":"The effective-medium theory is extended to calculate the equivalent dielectric constants of hollow spheres. The Maxwell-Garnett, inverted Maxwell-Garnett, and Monecke rules are adopted to investigate the hollow ice spheres. Compared with P. Yang's paper, very different Maxwell-Garnett and inverted Maxwell-Garnett formulas but identical mean permittivity values are presented. In order to verify the validity of effective-medium theory in Mie scattering calculation of hollow dielectric spheres, n-layered Mie solution is adopted to calculate the scattering of hollow ice spheres. The mean permittivity values are used in common Mie scattering calculation of uniform sphere. By comparison, it is evident that the effective-medium theory is suitable for small size parameters. For size parameter is about ten, the effective theory is suitable for a very thin hollow ice sphere. At last, it is pointed out that the effective-medium theory make Mie scattering calculation of hollow spheres easier, and can be extended further to non-uniform and eccentric hollow spheres.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132225524","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353455
Yang Fang, Zhang Peng, G. C. Jiang, X. Dong
A multi-arm conical spiral wire antenna used in low orbit satellite communications is proposed, which can form cardio or conical patterns by adjusting its geometrical parameters. It has better polarization characteristic than the two-arm spiral antenna proposed in the reference. With the increase of its height and spiral constant its beam deviation from the axis increase while its power gain decrease to form conical radiation patterns. Several graphs about the influence of the parameters on radiation patterns are presented in this paper for the optimization of the antenna.
{"title":"Analysis and synthesis of a multi-arm conical spiral antenna to form shaped-conical radiation patterns","authors":"Yang Fang, Zhang Peng, G. C. Jiang, X. Dong","doi":"10.1109/ISAPE.2006.353455","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353455","url":null,"abstract":"A multi-arm conical spiral wire antenna used in low orbit satellite communications is proposed, which can form cardio or conical patterns by adjusting its geometrical parameters. It has better polarization characteristic than the two-arm spiral antenna proposed in the reference. With the increase of its height and spiral constant its beam deviation from the axis increase while its power gain decrease to form conical radiation patterns. Several graphs about the influence of the parameters on radiation patterns are presented in this paper for the optimization of the antenna.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134331268","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353387
Ming Liu, Chaowei Yuan, Tian-Song Li, Hong-Hai Wu
In this paper, compared with genetic algorithm (GA), an improved quantum genetic algorithm (QGA) was proposed, and it was used to calculate the complex excitations, amplitudes and phases of adaptive antenna arrays. The optimization goal is to maximize the output power of the desired signal and minimize the total output power of the interfering signals. Simulation results show that the improved QGA has better performance than existing GA.
{"title":"Radiation Pattern Synthesis for Adaptive Antenna Arrays Using Improved Quantum Genetic Algorithm","authors":"Ming Liu, Chaowei Yuan, Tian-Song Li, Hong-Hai Wu","doi":"10.1109/ISAPE.2006.353387","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353387","url":null,"abstract":"In this paper, compared with genetic algorithm (GA), an improved quantum genetic algorithm (QGA) was proposed, and it was used to calculate the complex excitations, amplitudes and phases of adaptive antenna arrays. The optimization goal is to maximize the output power of the desired signal and minimize the total output power of the interfering signals. Simulation results show that the improved QGA has better performance than existing GA.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122192006","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353407
Wan Liang, C. Xiande, H. Guoyu, Zhang Zhuoran
A new method based on time-gating technique for correcting phase errors caused by flexing cable is introduced, which can be used in planar near-field test systems. It was shown by simulation and experiments that this method is valid on X band and could be easily put into practice.
{"title":"A Time-Gating-Based Method for Correcting Phase Errors Caused by Cable Flexing in Planar Near-Field Measurements","authors":"Wan Liang, C. Xiande, H. Guoyu, Zhang Zhuoran","doi":"10.1109/ISAPE.2006.353407","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353407","url":null,"abstract":"A new method based on time-gating technique for correcting phase errors caused by flexing cable is introduced, which can be used in planar near-field test systems. It was shown by simulation and experiments that this method is valid on X band and could be easily put into practice.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115818907","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353284
Hou Xuan, Bai Zhen-xing
An airborne identification system is designed, which has been named airborne synthesized friend or foe and electronic countermeasure system (ASIFFC) and incorporates technology of identification friend or foe (IFF) and electronic countermeasure. ASIFFC uses the coordination type IFF technology and the non- coordination type IFF technology, and it has independent capability in identification and tracking. ASIFFC presents a plan that is the combination application of many kinds of identification technology, and it is development trend of IFF technology. In the article, firstly, it carries on the system design to ASIFFC. Secondly, subsystems have been given a minute description. The Sending device of LSID sends radio frequency inquiry signal to the goal object which has been locked by the radar. The receiving device of LSID receives reflection signal of goal object. The LSID is carried on IFF on the basis of the receiving or sending signals. The pattern identification device (PID) withdraws the image information of a goal object and contrasts them with the data in the image database and distinguishes the friend and foe attribute of object. The dual identification technology enormously enhanced the identification reliability.
{"title":"Study of Design of Airborne Synthesized IFF and Electronic Countermeasure System","authors":"Hou Xuan, Bai Zhen-xing","doi":"10.1109/ISAPE.2006.353284","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353284","url":null,"abstract":"An airborne identification system is designed, which has been named airborne synthesized friend or foe and electronic countermeasure system (ASIFFC) and incorporates technology of identification friend or foe (IFF) and electronic countermeasure. ASIFFC uses the coordination type IFF technology and the non- coordination type IFF technology, and it has independent capability in identification and tracking. ASIFFC presents a plan that is the combination application of many kinds of identification technology, and it is development trend of IFF technology. In the article, firstly, it carries on the system design to ASIFFC. Secondly, subsystems have been given a minute description. The Sending device of LSID sends radio frequency inquiry signal to the goal object which has been locked by the radar. The receiving device of LSID receives reflection signal of goal object. The LSID is carried on IFF on the basis of the receiving or sending signals. The pattern identification device (PID) withdraws the image information of a goal object and contrasts them with the data in the image database and distinguishes the friend and foe attribute of object. The dual identification technology enormously enhanced the identification reliability.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131827914","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353269
Du Yong-Xing, Xi Xiao-li, Wang Li-li
A new microwave hyperthermia antenna that isn't sensitive to neither its parameters nor fluctuation of the inputting frequency is presented in this paper. The finite element method was used to simulate the distributions of the electromagnetic fields and the specific absorption rate (SAR) of the Archimedes planar spiral antenna in phantom muscle tissues. The factors that affect the antenna performance including spiral wire's diameter, space of adjacent spiral circle and circle numbers are compared.
{"title":"The Analysis and Simulation of Planar Spiral Antenna for Microwave Hyperthermia","authors":"Du Yong-Xing, Xi Xiao-li, Wang Li-li","doi":"10.1109/ISAPE.2006.353269","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353269","url":null,"abstract":"A new microwave hyperthermia antenna that isn't sensitive to neither its parameters nor fluctuation of the inputting frequency is presented in this paper. The finite element method was used to simulate the distributions of the electromagnetic fields and the specific absorption rate (SAR) of the Archimedes planar spiral antenna in phantom muscle tissues. The factors that affect the antenna performance including spiral wire's diameter, space of adjacent spiral circle and circle numbers are compared.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131638169","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353449
X. Lian, Jianjiang Zhou
This paper introduces the propagator method (PM) to 2-D direction of arrival (DOA) estimation for uniform circular arrays (UCA). Two kinds of PM are presented, PM-ESPRIT and PM-MUSIC. Both operate in beamspace and require no eigen-decomposition calculation, therefore reduce the computational load significantly. PM-ESPRIT, which has natural pair matching structure, can provide accurate searching starts for PM-MUSIC, after introducing a new random process with zero mean. PM-MUSIC, based on real-valued beamspace manifold, achieves high resolution in 2-D DOA estimation for incoherent signal sources and has a better performance in dealing with the highly coherent sources than UCA-RB-MUSIC.
{"title":"2-D DOA Estimation for Uniform Circular Arrays with PM","authors":"X. Lian, Jianjiang Zhou","doi":"10.1109/ISAPE.2006.353449","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353449","url":null,"abstract":"This paper introduces the propagator method (PM) to 2-D direction of arrival (DOA) estimation for uniform circular arrays (UCA). Two kinds of PM are presented, PM-ESPRIT and PM-MUSIC. Both operate in beamspace and require no eigen-decomposition calculation, therefore reduce the computational load significantly. PM-ESPRIT, which has natural pair matching structure, can provide accurate searching starts for PM-MUSIC, after introducing a new random process with zero mean. PM-MUSIC, based on real-valued beamspace manifold, achieves high resolution in 2-D DOA estimation for incoherent signal sources and has a better performance in dealing with the highly coherent sources than UCA-RB-MUSIC.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"375 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133287193","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353217
Jun Gao, Xiangyu Cao, J. Qin, K. Luk
In this paper, the fast and efficient method based on MOM is proposed for the analysis antenna with bodies of revolution. The Fourier series is as the base function along the direction of revolution, the order of matrix is efficiency reduced. The FFT transform is used to avoid singularity. Take the wire antenna mounted on a finite solid conducting cylinder as an example, the impedance characteristics and radiation pattern is computation, The good agreement that numerical data obtained using above analysis are compared with those of CST soft shows the method is efficient.
{"title":"The Impedance Characteristics Analysis of Antenna with Bodies of Revolution","authors":"Jun Gao, Xiangyu Cao, J. Qin, K. Luk","doi":"10.1109/ISAPE.2006.353217","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353217","url":null,"abstract":"In this paper, the fast and efficient method based on MOM is proposed for the analysis antenna with bodies of revolution. The Fourier series is as the base function along the direction of revolution, the order of matrix is efficiency reduced. The FFT transform is used to avoid singularity. Take the wire antenna mounted on a finite solid conducting cylinder as an example, the impedance characteristics and radiation pattern is computation, The good agreement that numerical data obtained using above analysis are compared with those of CST soft shows the method is efficient.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132233871","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353231
Lu Gui-zhen, Li Yan-fei
The application of spectral element method in electromagnetics is developed in this paper. It is extensively used in the computing mathematics. In this paper, the EM scattering problem is discussed by spectral element method. The comparison is made between finite element method and spectral element method.
{"title":"The Study of Spectral Element method in Electromagnetic Fields","authors":"Lu Gui-zhen, Li Yan-fei","doi":"10.1109/ISAPE.2006.353231","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353231","url":null,"abstract":"The application of spectral element method in electromagnetics is developed in this paper. It is extensively used in the computing mathematics. In this paper, the EM scattering problem is discussed by spectral element method. The comparison is made between finite element method and spectral element method.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133415648","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 : 2006-10-01DOI: 10.1109/ISAPE.2006.353374
L. Ping-an, Q. Wei, Sun Qin
Applying smart antennas to an OFDMA system is investigated. A simple resource allocation scheme for array-antenna based OFDMA systems is proposed. The resource allocation algorithm is applied to the pilot data when no beam is formed and channel estimation in frequency-domain is implemented. After piloting, a beam is formed for each user to enhance the performance of the system. Simulations based on the SUI channel model according to the standard of IEEE 802.16e WMAN are carried out to examine the performance of the proposed approach.
{"title":"A Simple Approach of Resource Allocation in Antenna-Array Based OFDMA Systems","authors":"L. Ping-an, Q. Wei, Sun Qin","doi":"10.1109/ISAPE.2006.353374","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353374","url":null,"abstract":"Applying smart antennas to an OFDMA system is investigated. A simple resource allocation scheme for array-antenna based OFDMA systems is proposed. The resource allocation algorithm is applied to the pilot data when no beam is formed and channel estimation in frequency-domain is implemented. After piloting, a beam is formed for each user to enhance the performance of the system. Simulations based on the SUI channel model according to the standard of IEEE 802.16e WMAN are carried out to examine the performance of the proposed approach.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132576737","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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