where TdB is the truncated taper in decibels, RT is the maximum antenna radius, and ra = + Ya • The electric field at the ground can be written by use of Eq. 7 in the form where XI + Y* « Rf. This Fourier transform integral cannot in general be solved in closed form; however, for the special condition at rectenna boresight with Xg = Ya = 0, 0 = 0°; and the field contributions from each subarray adding in-phase, the power density for the 10 dB Gaussian taper is determined to be
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