Ongoing Retrodirective Array Research at UCLA

I. Introduction When receiving a signal from an unspecified direction, retrodirective arrays [1] are able to transmit a signal response to that same direction without any previous knowledge of the source direction. This function is performed automatically, without the use of phase-shifters or digital circuitry. The capability to perform high gain antenna pointing automatically, makes the retrodirective array an attractive candidate for advanced digital mobile communication systems. This paper discusses ongoing research efforts towards developing new retrodirective array architectures at the University of California, Los Angeles (UCLA). The arrays presented here have other features in addition to the self-phasing aspects such that they can be applied to practical communication systems.