Dissertation > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism

Electromagnetic scattering media targets based on the new three-dimensional integral equation analysis

Author AnNing
Tutor ChenRuShan;YeXiaoDong
School Nanjing University of Technology and Engineering
Course Electromagnetic Field and Microwave Technology
Keywords method of moment multilevel fast multipole method half-space green’s function JMCFIE integral function Müller function chiral object
Type Master's thesis
Year 2008
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To realize efficient solution of electromagnetic(EM) scattering from complex target has very practical value for the design of radar system and identify of radar target. The electromagnetic scattering of 3 D complex targets has attracted much more attention in engineering applications.Recently,intensive investigations have been done to find fast and accurate numerical methods to solve such problems.The FMM and MLFMA are applied to analyze the electromagnetic scattering and radiation of electrical-large targets which overcomes the limitation of conventional high frequency method.But those methods are all based on free space that leads to neglect some important factors.So it will have more significance that considering objects modeled in half-space.Based on these engineering application background,the research work realize a simple extension the free space algorithms to the half-space cases.The work not only investigates the expression and solution of half-space green’s function, but also considers lots of different environment factors which can affect electromagnetic scattering and radiation of targets.In addition,a new integral function named JMCFIE is presented which improves the conventional PMCHWT integral function.The new integral function can essentially improve characteristic of impedance matrix and accelerate iterative converging.At the same time,the Müller function is applied for overcoming the low frequency breakdown.The JMCFIE integral function is implemented in analyzing the electromagnetic characteristic of chiral object.The numerical examples show the accuracy and efficiency of the methods proposed in the dissertation.

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