Pub Date : 2006-10-01DOI: 10.1109/ISAPE.2006.353378
Liguo Liu, Yibing Gai, Haisong Wang, Guowen Ding
The direction-of-arrival (DOA) estimation for coherent signal is always an important aspect, because it will cause rank loss of the spatial covariance matrix. The conventional solution is to use smoothing algorithm, but recently a new technique is proposed, which reconstructs the spatial covariance matrix in Toeplitz pattern and no longer be affected by coherency. In this paper, an improved algorithm based the new technique is proposed, which can reduce the computational burden. Finally, a 2-D coherent DOA estimation method using 3-aixs crossed array is suggested. Simulation results are presented to verify the efficacy.
{"title":"An Improved ESPRIT-like Algorithm for Coherent Signal and Its Application for 2-D DOA Estimation","authors":"Liguo Liu, Yibing Gai, Haisong Wang, Guowen Ding","doi":"10.1109/ISAPE.2006.353378","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353378","url":null,"abstract":"The direction-of-arrival (DOA) estimation for coherent signal is always an important aspect, because it will cause rank loss of the spatial covariance matrix. The conventional solution is to use smoothing algorithm, but recently a new technique is proposed, which reconstructs the spatial covariance matrix in Toeplitz pattern and no longer be affected by coherency. In this paper, an improved algorithm based the new technique is proposed, which can reduce the computational burden. Finally, a 2-D coherent DOA estimation method using 3-aixs crossed array is suggested. Simulation results are presented to verify the efficacy.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"53 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":"122129638","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.2006.353291
Jungil Heo, Wooshik Kim
AODV is one of the various routing protocol on ad-hoc networks. This paper analyzes information about the user who moves from among the multi techniques which composes the ubiquitous environment, and proposes about the network configuration and management to execute ubiquitous system. In this paper, we propose efficient method that has AODV protocol advantage and the property of power efficiency and reliable data transmission in the hospital or home environment. Our proposed method uses the mobile nodes which have the sensor and the role and an operational process of each system configuration is described in this paper.
{"title":"Ad-hoc routing Protocol-based Ubiquitous Network System In the Hospital Environment","authors":"Jungil Heo, Wooshik Kim","doi":"10.1109/ISAPE.2006.353291","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353291","url":null,"abstract":"AODV is one of the various routing protocol on ad-hoc networks. This paper analyzes information about the user who moves from among the multi techniques which composes the ubiquitous environment, and proposes about the network configuration and management to execute ubiquitous system. In this paper, we propose efficient method that has AODV protocol advantage and the property of power efficiency and reliable data transmission in the hospital or home environment. Our proposed method uses the mobile nodes which have the sensor and the role and an operational process of each system configuration is described in this paper.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"24 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":"116849382","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}
In this paper, a novel high-performance size-reduced fractal-shaped dual planar photonic bandgap (DP-PBG) microstrip low-pass filter is proposed. By employing fractal-shaped geometry of the microstripline, the physical size of the proposed structure reduced significantly compared with the size of the conventional structures, and by employing dual plane arrangement and the square and linear Chebyshev tapering techniques, the proposed structure achieves wideband with high attenuation in the stopband and low ripple level in the passband. The structure was fabricated and tested, and the measured results are found in good agreement with the simulated results.
{"title":"Size-reduced Fractal-shaped Dual Planar PBG Microstrip Low-pass Filter","authors":"Wen-ling Chen, Guangming Wang, Yi-na Qi, Jian-gang Liang","doi":"10.1109/ISAPE.2006.353441","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353441","url":null,"abstract":"In this paper, a novel high-performance size-reduced fractal-shaped dual planar photonic bandgap (DP-PBG) microstrip low-pass filter is proposed. By employing fractal-shaped geometry of the microstripline, the physical size of the proposed structure reduced significantly compared with the size of the conventional structures, and by employing dual plane arrangement and the square and linear Chebyshev tapering techniques, the proposed structure achieves wideband with high attenuation in the stopband and low ripple level in the passband. The structure was fabricated and tested, and the measured results are found in good agreement with the simulated results.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"24 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":"124097934","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.2006.353380
Lin Jing-ran, Peng Qicong, Shao Huai-zong, Ju Tai-liang
A novel method of broadband robust adaptive beamforming is proposed in this paper to deal with the signal cancellation caused by correlated interferences and DOA uncertainties. To achieve this goal, the classic techniques of spectral averaging and diagonal loading are integrated into the beamforming, with the former aiming at decorrelation and the latter at robustness against DOA uncertainties. Moreover, the optimal loading is selected based on worst-case performance optimization and a simple closed-form solution to it is suggested after some approximations. Besides its simplicity and low computational cost, this analytical solution reveals how different factors affect the optimal loading. Compared with many relevant methods, the proposed one achieves better robustness against DOA uncertainties, while suppressing both correlated and uncorrelated interferences effectively. Its excellent performance is confirmed via a number of numerical examples.
{"title":"Broadband Robust Adaptive Beamforming in the Presence of Correlated interferences and DOA uncertainties","authors":"Lin Jing-ran, Peng Qicong, Shao Huai-zong, Ju Tai-liang","doi":"10.1109/ISAPE.2006.353380","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353380","url":null,"abstract":"A novel method of broadband robust adaptive beamforming is proposed in this paper to deal with the signal cancellation caused by correlated interferences and DOA uncertainties. To achieve this goal, the classic techniques of spectral averaging and diagonal loading are integrated into the beamforming, with the former aiming at decorrelation and the latter at robustness against DOA uncertainties. Moreover, the optimal loading is selected based on worst-case performance optimization and a simple closed-form solution to it is suggested after some approximations. Besides its simplicity and low computational cost, this analytical solution reveals how different factors affect the optimal loading. Compared with many relevant methods, the proposed one achieves better robustness against DOA uncertainties, while suppressing both correlated and uncorrelated interferences effectively. Its excellent performance is confirmed via a number of numerical examples.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"274 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":"125837059","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.2006.353566
G. Wang, Jieran Fang, Xiaoting Dong
Flat left-handed material (LHM) lens provides new solution to high resolution near-field microwave target detection and imaging. By scanning the transmitting and receiving antenna pair (T-R pair) to focus microwave onto target on the other side of LHM lens and recording the intensity distribution of microwave field backscattered from the target and refocused by the LHM lens, the image of the target under detection can be formed simply by screening the recorded backscattered fields. Numerical simulations demonstrate that the scanning of T-R pair will provide higher imaging resolution than the focusing and refocusing resolution of flat LHM lens.
{"title":"On the Use of LHM Lens for Near-Field Target Detection and Imaging","authors":"G. Wang, Jieran Fang, Xiaoting Dong","doi":"10.1109/ISAPE.2006.353566","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353566","url":null,"abstract":"Flat left-handed material (LHM) lens provides new solution to high resolution near-field microwave target detection and imaging. By scanning the transmitting and receiving antenna pair (T-R pair) to focus microwave onto target on the other side of LHM lens and recording the intensity distribution of microwave field backscattered from the target and refocused by the LHM lens, the image of the target under detection can be formed simply by screening the recorded backscattered fields. Numerical simulations demonstrate that the scanning of T-R pair will provide higher imaging resolution than the focusing and refocusing resolution of flat LHM lens.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"1 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":"128571713","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.2006.353542
Yan Zhang, Shan-wei Lu
Attention is focused on a new conformal FDTD method. The contour-path value of the electric field component can be obtained more accurately by the piecewise integration. Several examples are simulated to demonstrate the proposed method. Numerical results show that the PI-CFDTD method provides increased accuracy and stability over the conventional CFDTD method.
{"title":"Piecewise Integration for Conformal FDTD Method to Reduce Staircasing Errors","authors":"Yan Zhang, Shan-wei Lu","doi":"10.1109/ISAPE.2006.353542","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353542","url":null,"abstract":"Attention is focused on a new conformal FDTD method. The contour-path value of the electric field component can be obtained more accurately by the piecewise integration. Several examples are simulated to demonstrate the proposed method. Numerical results show that the PI-CFDTD method provides increased accuracy and stability over the conventional CFDTD method.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"10 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":"127028328","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.2006.353550
Y. Geng, Lewei Li, Jian Wu
On the basis of spherical vector wave functions in uniaxial anisotropic left-handed materials (LHMs) and the first, second, third and fourth spherical vector wave functions in uniaxial anisotropic LHMs satisfy the same differential equation, the electromagnetic fields in uniaxial anisotropic LHMs can be expressed as an addition of the first and second spherical vector wave functions in uniaxial anisotropic LHMs. Applying the boundary conditions of electromagnetic fields in the interface between LHMs and free space, in the surface of conducting sphere, the expansion coefficients of electromagnetic field in uniaxial anisotropic LHMs and scattering field in free space can be derived, and then the radar section cross (RCS) of a plane wave scattering by a LHMs anisotropic uniaxial-coated conducting sphere. Some numerical results are given in this paper.
{"title":"A Plane Wave Scattering by a LHM Anisotropic Uniaxial-coated Conducting Sphere","authors":"Y. Geng, Lewei Li, Jian Wu","doi":"10.1109/ISAPE.2006.353550","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353550","url":null,"abstract":"On the basis of spherical vector wave functions in uniaxial anisotropic left-handed materials (LHMs) and the first, second, third and fourth spherical vector wave functions in uniaxial anisotropic LHMs satisfy the same differential equation, the electromagnetic fields in uniaxial anisotropic LHMs can be expressed as an addition of the first and second spherical vector wave functions in uniaxial anisotropic LHMs. Applying the boundary conditions of electromagnetic fields in the interface between LHMs and free space, in the surface of conducting sphere, the expansion coefficients of electromagnetic field in uniaxial anisotropic LHMs and scattering field in free space can be derived, and then the radar section cross (RCS) of a plane wave scattering by a LHMs anisotropic uniaxial-coated conducting sphere. Some numerical results are given in this paper.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"02 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":"129959554","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.2006.353570
Ren Yuchao, G. Lixin
A multiple-scattering method is formulated to calculate the backscattering from time-varying dielectric oceanic surface. The theoretical prediction is compared with the experimental data, and reasonably good agreement is obtained. Much attention is paid to discuss the amplitude distribution of the scattered field when the surface varies in a random way, and these theoretical results are compared with the classic distributions to find the best fitting.
{"title":"Investigation on the Backscattering from the Time-varying Oceanic Surface with Consideration of Multiple-scattering","authors":"Ren Yuchao, G. Lixin","doi":"10.1109/ISAPE.2006.353570","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353570","url":null,"abstract":"A multiple-scattering method is formulated to calculate the backscattering from time-varying dielectric oceanic surface. The theoretical prediction is compared with the experimental data, and reasonably good agreement is obtained. Much attention is paid to discuss the amplitude distribution of the scattered field when the surface varies in a random way, and these theoretical results are compared with the classic distributions to find the best fitting.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"51 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":"131027493","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.2006.353569
Guo Dandan, Su Donglin, Liu Yan
Inverse synthetic aperture radar (ISAR) is a way of radar imaging, but the recognition of this way is not very well. This paper presents a different way of radar imaging, which bases on GRECO. This paper compares the two ways, and the conclusion is that the new way is better than the ISAR imaging in shape of its recognition, and new way imaging could be an assistant imaging to the ISAR imaging.
{"title":"A New Method of Radar Imaging Bases on GRECO","authors":"Guo Dandan, Su Donglin, Liu Yan","doi":"10.1109/ISAPE.2006.353569","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353569","url":null,"abstract":"Inverse synthetic aperture radar (ISAR) is a way of radar imaging, but the recognition of this way is not very well. This paper presents a different way of radar imaging, which bases on GRECO. This paper compares the two ways, and the conclusion is that the new way is better than the ISAR imaging in shape of its recognition, and new way imaging could be an assistant imaging to the ISAR imaging.","PeriodicalId":113164,"journal":{"name":"2006 7th International Symposium on Antennas, Propagation & EM Theory","volume":"1 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":"130681987","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.2006.353564
Z. Weng, Nai‐biao Wang, Y. Jiao
A new method to improve the gain of patch antenna with metamaterial composed of ring aperture lattice is presented. A comparison between the conventional patch antenna and the new metamaterial patch antenna is given. The experimental results show that this method is effective and metamaterial structure can realize congregating the radiation energy, so the gain of the antenna with metamaterial can greatly increase compared with the conventional one.
{"title":"Study on High Gain Patch Antenna with Metamaterial Cover","authors":"Z. Weng, Nai‐biao Wang, Y. Jiao","doi":"10.1109/ISAPE.2006.353564","DOIUrl":"https://doi.org/10.1109/ISAPE.2006.353564","url":null,"abstract":"A new method to improve the gain of patch antenna with metamaterial composed of ring aperture lattice is presented. A comparison between the conventional patch antenna and the new metamaterial patch antenna is given. The experimental results show that this method is effective and metamaterial structure can realize congregating the radiation energy, so the gain of the antenna with metamaterial can greatly increase compared with the conventional one.","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":"132374810","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：