dimensional circular array of point sources located at the center of each subarray or power module (4). This can be written mathematically bv Using the Fourier transform integral (Eq. 1) and the convolution principle, the com- positie ground field pattern may be written where the individual field patterns are found by the integration process of Eq. 1. The SPS ground electric field is thus the product of its array, or grating lobe, pattern and its subarray pattern as shown in Fig. 2. Since the Fourier integral is linear, the ground pattern from an additive antenna illumination function is the sum of the individual ground patterns, i.e.,
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