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In a method of moments (MM) computation, one must compute the impedance matrix at each new frequency. Since computation of the MM impedance matrix at a single frequency can be a very timeconsuming process, performing an MM computation over a wide frequency range can require a prohibitive amount of CPU time. Here we describe a method where the impedance matrix is computed at relatively large frequency intervals and then interpolated to approximate its values at intermediate frequencies.Basically, the method trades reduced computer CPU time for increased storage.

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Abstruct-A solution to the problem of plane wave scattering by a rectangular microstrip patchon a grounded dielectric substrate is presented. The model does not include the microstrip feed, and thus does not include the so-called "antenna mode" component of the scattering. The solution begins by formulating an electric field integral equation for the surface current density on the microstrip patch. The integral equation is solved using the method of moments. Computed data for the patch radar cross section (RCS) is found to be in close agreement with measurements over a broad frequency range. The microstrip RCS versus frequency consists of a number of large peaks which are identified as impedance or pattern factor resonance peaks.

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