The associated antenna/rectenna geometrical configuration is shown in Fig. 1. The Fourier integral is a linear mathematical operation which allows the SPS antenna field distribution to be divided into simpler components for the multiple beam analysis. The SPS antenna is an active retrodirective array using an uplink pilot beam signal to provide phase conjugation. The antenna is mechanically divided into 10.4 by 10.4 m subarrays; the subarrays are further divided into power modules. Each subarray or each power module (that portion of a subarray fed by a single power tube) has its own RF (radio frequency) receiver which processes the uplink pilot beam signal from a transmitter at the center of a rectenna. The uplink receivers measure the phase shift (delay) of the pilot signal and provide the conjugated phase to the power tube within a power module. Each power module acts as an individual antenna, with uniform amplitude and phase across its surface. The modules are phased to provide a single coherent beam focused at the center of a ground rectenna. The composite SPS antenna may be thought of as a single rectangular subarray convolved with a two-
RkJQdWJsaXNoZXIy MTU5NjU0Mg==