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This reduction is achieved by combining primary CBFs (PCBFs) with the secondary level CBFs (SCBFs) to form a single merged ultra-wideband characteristic basis function (MUCBF). As the MUCBF incorporates the effects of PCBFs and SCBFs, the accuracy does not change significantly compared to that obtained by the SVD-IUCBFM. Furthermore, the efficiencies of constructing the CBFs and filling the reduced matrix are improved. Numerical examples verify and demonstrate that the proposed method is credible both in terms of accuracy and efficiency.<\/jats:p>","DOI":"10.3233\/jcm-204704","type":"journal-article","created":{"date-parts":[[2020,10,2]],"date-time":"2020-10-02T13:57:52Z","timestamp":1601647072000},"page":"865-874","source":"Crossref","is-referenced-by-count":0,"title":["Ultra-wideband characteristic basis function method merging the secondary level characteristic basis functions for rapid computation of wideband radar cross section problems from conducting targets"],"prefix":"10.1177","volume":"21","author":[{"given":"Zhong-Gen","family":"Wang","sequence":"first","affiliation":[{"name":"College of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China"}]},{"given":"Jun-Wen","family":"Mu","sequence":"additional","affiliation":[{"name":"College of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China"}]},{"given":"Wen-Yan","family":"Nie","sequence":"additional","affiliation":[{"name":"College of Mechanical and Electrical Engineering, Huainan Normal University, Huainan, Anhui 232001, China"}]}],"member":"179","reference":[{"key":"10.3233\/JCM-204704_ref2","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1109\/74.250128","article-title":"The fast multipole method for the wave equation: A pedestrian prescription","volume":"53","author":"Coifman","year":"1993","journal-title":"IEEE Antennas and Propagation Magazine"},{"key":"10.3233\/JCM-204704_ref3","doi-asserted-by":"crossref","first-page":"1488","DOI":"10.1109\/8.633855","article-title":"Multilevel fast multipole algorithm for electromagnetic scattering by large complex objects","volume":"45","author":"Song","year":"1997","journal-title":"IEEE Transactions on Antennas and Propagation"},{"key":"10.3233\/JCM-204704_ref4","doi-asserted-by":"crossref","first-page":"1225","DOI":"10.1029\/96RS02504","article-title":"Adaptive integral method for solving large-scale electromagnetic scattering and radiation problems","volume":"31","author":"Bleszynski","year":"1996","journal-title":"Radio Sciences"},{"key":"10.3233\/JCM-204704_ref5","doi-asserted-by":"crossref","first-page":"4588","DOI":"10.1109\/TAP.2011.2165474","article-title":"Fast-factorization acceleration of MoM compressive domain-decomposition","volume":"59","author":"Freni","year":"2011","journal-title":"IEEE Transactions on Antennas and Propagation"},{"key":"10.3233\/JCM-204704_ref6","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1002\/mop.10685","article-title":"Characteristic basis function method: A new technique for efficient solution of method of moments matrix equations","volume":"36","author":"Prakash","year":"2003","journal-title":"Microwave and Optical Technology Letters"},{"key":"10.3233\/JCM-204704_ref7","doi-asserted-by":"crossref","unstructured":"M. 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