Fig. 7. Microwave beam characteristics RF power-transmission system, therefore, is inherently fail-safe and under control from the ground. A series of detailed experiments has been designed to develop the data base to remove the uncertainties that now exist. In order to obtain information on these questions, exploratory research projects are being defined within the current concept evaluation program. One approach would involve the laboratory development and testing of an antenna subarray and its various elements. The transmitting antenna located on the satellite and shown in Fig. 8 consists of a large number of 10-meter (33 foot) subarrays. Each subarray consists of wave-guides, microwave power amplifiers, radiators, and phase control electronics. The subarray would be tested in an electronic systems test laboratory, a large anechoic chamber with antenna range, and a thermal-vacuum chamber. A test setup involving the anechoic chamber and test range is shown in Fig. 9. The subarray is mounted on the anechoic chamber and is radiating to a rectenna Fig. 8. Transmitting antenna subarray
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