Fig. 11. Dual microwave antenna concept. Fig. 12. Sandwich panel solid state concept. work in the microwave system area indicates the midspan deflections of approximately 1 m are acceptable with the resulting misalignment being compensated by electronic beam steering. The smallest antenna building block is the power module, which varies in size from the one illustrated (which is used at the center portion of the antenna) to 3.40 by 5.82 m at the periphery of the antenna. Ten different power module sizes are used to comprise the antenna. Each power module has a klystron located in its center. The power modules are arranged into subarrays measuring 10.2 by 11.64 m. Each subarray has its own phase control electronics. Nine subarrays are connected to form a mechanical module 30.62 by 34.92 m. The mechanical modules are attached to the tension webs. Alternatives to the reference system Replacement of the klystron dc/RF converters with solid-state dc/RF converters was the major alternative considered to the Reference system. Because of the low voltages that are necessary to operate transistor devices (e.g. 40 V), power distribution and control is a problem. Additionally, the base temperatures of the devices
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