CONJUGATE-PAIR FEED SYSTEMS.
NAVAL RESEARCH LAB WASHINGTON D C
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Two microwave feed circuits have been developed for use in electronically scanned antenna arrays. Both of these circuits offer advantages over the conventional circuits employing nonreciprocal phase shifters of the digital type. The first circuit permits reduction in the number of phase shifters by requiring one phase shifter for each pair of radiating elements rather than the usual phase shifter per radiating element, while the second circuit permits simultaneous reception and transmission of signals with independent control of the transmit and receive beam directions. An X-band model was constructed, and radiation patterns were obtained from a seven-element array fed by these circuits. The results demonstrate the feasibility of both circuits.
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