where KXm , ^vmn is proportional to the X and Y distances measured from grating lobe m,n; where X? + K? Rf- The main beam patterns for the 10 dB Gaussian taper and for uniform illumination are approximately the same when considering only grating lobe effects. The ground electric field pattern can be greatly simplified if uniform illumination is used in the transmit antenna. Accordingly, the pattern for uniform illumination may be written
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