Integrated Subarray - The retrodirective phase array configuration utilizes 7220-10.4 x 10.4 meter subarrays arranged in a quantized 10 db taper configuration conforming to dimensional requirements which will result in a maximum RSS error associated loss of 2%. Figure B-16 shows a 4-module subarray which contains 4 klystrons, associated radiation waveguides, thermal control radiation, and control devices. The subarray support structure is composed of perimeter beams, lateral and longitudinal I-beams. Figure B-17 shows an antenna quadrant illustrating the arrangement of subarrays on the antenna to obtain the desired 10 db taper. The number of klystrons per subarray varies from 4 in the outer edge of the antenna to 36 per subarray in the center. Figure B-18 shows a plot of microwave power density versus antenna radius illustrating a 10-step subarray distribution that closely approximates the desired Gaussian distribution. Antenna Structure - The microwave power transmitter primary structure provides overall shape and form to the transmitter. The primary structure is an A-frame open truss structure, 130 meters deep, with a quasi-hexagonal shape in excess of 1,000 meters width and length. The primary structure and its relationship to the secondary structure and the rest of the power transmitter are shown in figure B-19. The A-frame elements of the primary structure are made up of 7-1/2 meter continuous chord beams composed of graphite polysulfone composite structure. Secondary structure provides structural bridging over the primary structure with a sufficiently small repeating structure element interval to allow installation of the transmitter subarrays. The secondary structure, shown in figure B-20 is a deployable cubic truss, with telescoping vertical members to minimize packaging volume. The members are made from graphite composite materials and the joints all include a rigidizing mechanism or device to provide complete ridigity of the structure after deployment. Diagonal crossmembers are removable as necessary to allow for maintenance of the subarrays.
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