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Jin, Jianming Ni, Sean Sze-Shun 2011-05-07T13:06:30Z 2011-05-07T13:06:30Z 10000-01-01 1996 Many low-frequency and high-frequency techniques exist for the solution of scattering and radiation problems. In this thesis, a hybrid method combining the finite-element method (FEM) and the shooting-and-bouncing-ray (SBR) method is introduced for scattering and radiation problems from large and complex targets with small cavities or microstrip patch antennas. By combining the two methods, the advantages of each method are retained, while the disadvantages of each method are avoided. Specifically, the speed and efficiency of the SBR method are retained for the analysis of large targets, while the accuracy of the FEM is retained for the analysis of the cavities and patch antennas. The results from the two methods are not simply added together. With the equivalence principle, we are able to decouple the problem into two separate problems; and with the reciprocity theorem and the SBR algorithm, we are able to recombine the two results, including the multiple bounce contributions from both the incident and scattered fields. Validation of the hybridization of the FEM and the SBR method is performed throughout this work. This is accomplished in two- and three-dimensional scatterings from large targets with small cavities or cracks, and in the radiation from microstrip patch antennas on large host bodies. By observing the validation of this technique, the applications of this method become obvious, and will aid in the analysis and prediction of scattering and radiation from large vehicles with small features. Made available in DSpace on 2011-05-07T13:06:30Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9625171.pdf: 3923037 bytes, checksum: 47369efe733bbdfc1e83da1277986e38 (MD5) Previous issue date: 1996 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:50:16Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:22:57-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9625171 (UMI)AAI9625171 http://hdl.handle.net/2142/21363 eng Copyright 1996 Ni, Sean Sze-Shun Engineering, Electronics and Electrical Hybridization of the finite element method and the shooting-and-bouncing ray method for scattering and radiation from large and complex targets text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.