Abstract
A numerical technique employing the method of moments (MOM) and physical optics (PO) is presented for studying the scattering from a planar slotted waveguide array antennas. The slot scattering is calculated by MOM. Special attention is paid to the evaluation of the admittance matrix elements, which involve the internal and external mutual coupling. The structural scattering is solved using PO. Numerical results are given to demonstrate the effects of several factors including the number of basis functions , the thickness of waveguide on the radar cross section (RCS) of a slot array. As a check of the method, numerical results are compared with earlier calculations. Agreement has been found to be quite satisfactory.
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