[EMC]An Efficient Multiregion Model for Electromagnetic Scattering and Radiation by PEC Targets

Abstract—An efficient multiregion model has been proposed wX*F'r"z  
for the fast implementation of the electromagnetic scattering by ' Zmslijf  
perfectly electrical conducting (PEC) targets and the radiation of b#[7A  
point sources or wire antennas near PEC targets. In the multiregion F/I`EV  
model, the PEC target under consideration is divided by multiple q-)Ynp4'  
regions depending on the position of point source/antenna or
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the incident direction of plane waves. Then the method of moments />\6_kT  
(MoM) is used on the first region, which is close to the source or is RTR@p =ck  
the illuminated region, to obtain the accurate electric current. The P1f@?R&t+  
mutual coupling between different regions are considered approximately H%AC *,  
based on the magnetic-field integral equation, from which >k{KwFB^S  
closed-form approximations for electric currents on other regions 5U+a{oA  
are derived. Because MoM is only performed on the first region, 17{$D,P  
the number of unknowns in the new model is much fewer than SYsbe
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that in the full MoM analysis, making the new model much more &;O)Dw  
efficient. Compared with the published hybrid methods, the multiregion R7xEE7p
 
model gives a more reasonable physical explanation, and #
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provides a better accuracy in both currents and scattered fields. 4BgrG[l)  
Numerical simulations for two-dimensional (2-D) prob .. K9(Su`zr  
hB)TH'R{:  

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