{"title":"The multilevel compressed block decomposition algorithms for analyzing the scattering of objects in half space","authors":"D. Ding, R. Chen, Z. Fan, S. Shen, Z. Jiang","doi":"10.1109/IWEM.2012.6320326","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320326","url":null,"abstract":"The convergence rate of iterative methods can vary in an unpredictable way. It is related to the matrix condition number, which is notoriously bad for the electric field integral equation (EFIE) in the large-scale electromagnetic problems. Therefore, an efficient direct solution-multilevel compressed block decomposition (MLCBD) algorithm based on the adaptive cross approximation (ACA) algorithm is applied to overcome this problem, it is very efficient for the Monostatic problems. Simulation results of the objects up and below ground in half space demonstrate that the MLCBD method is efficient for analyzing electromagnetic problems.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134561014","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}
{"title":"An efficient multiregion model for the EM scattering of a dielectric rough surface","authors":"Yiwen Wei, Li-xin Guo","doi":"10.1109/IWEM.2012.6320325","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320325","url":null,"abstract":"An efficient multiregion model is extended with the single integral equation (SIE) method to calculate the EM scattering from a dielectric rough surface. In the multiregion model, the rough surface is divided into multiple regions depending on their positions along the rough surface as well as the energy distribution of the incident wave. Two intermediate regions are chosen as the domain region on which the method of moment (MoM) is adopted. The mutual couplings between different regions are considered approximately based on the magnetic and field integral equations, from which closed-form approximations for electric current on other regions are derived.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133302000","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}
Shen Wang, K. Abe, H. Arai, N. Takemura, T. Mitsui
{"title":"A low-profile switched beam antenna using parasitic elements for indoor base station","authors":"Shen Wang, K. Abe, H. Arai, N. Takemura, T. Mitsui","doi":"10.1109/IWEM.2012.6320351","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320351","url":null,"abstract":"A novel indoor base station antenna is proposed in the paper. The low-profile antenna can provide switchable beam as well as two orthogonal polarized radiation patterns. The form and switch of beam directions is achieved by 4 wire elements arranged near the square patch antenna. The beam is tilted by the on/off state of switch for wire elements. A switch is also proposed and utilized to the antenna. The proposed antenna is expected to use for indoor base station.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115346359","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}
{"title":"Diagonal Chassis Mode for mobile handset LTE MIMO antennas and its application to correlation reduction","authors":"Shuai Zhang, Z. Ying, Sailing He","doi":"10.1109/IWEM.2012.6320329","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320329","url":null,"abstract":"A new kind of chassis mode, namely, Diagonal Chassis Mode, is introduced in this paper. It can be easily excited for PIFAs by selecting a proper shorting point on the ground plane. Through this mode the correlation coefficient between MIMO PIFAs operating at LTE 700 MHz bands can be reduced effectively with the improvement of total efficiency and impedance bandwidth.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116067458","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}
{"title":"Integral equation based on domain decomposition method for body of translation","authors":"M. Jiang, Jun Hu","doi":"10.1109/IWEM.2012.6320343","DOIUrl":"https://doi.org/10.1109/IWEM.2012.6320343","url":null,"abstract":"In this paper, a hybrid scheme named IE-DDM-MLFMA with Gauss-Seidel iteration is proposed to calculate the scattering from the perfect electric conductor body of translation. The computational body of translation can be partitioned into concentric non-overlapping subdomains. Each of integral equation systems are solved separately, thus reducing the complexity of the original problem. For the solution of the resulting linear systems we describe appropriate iterative solution strategies using Gauss-Seidel iteration. A Local multilevel fast multipole algorithm is developed to further speed up the procedure of sweeping every interaction among sub-domains and this procedure is called outer iteration. Meanwhile, the iterative procedure in every periodic sub-domain called inner iteration is performed by MLFMA. It is available to applying two sets of MLFMA grids for the translation invariant feature of BOT problem. The main advantage offered by this technique is a reduction in memory requirement an.d CPU time. In addition block-diagonal pre-conditioner is utilized to speed up the convergence of iterative solutions. Numerical examples are presented that illustrate its potential.","PeriodicalId":314019,"journal":{"name":"2012 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125896340","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}