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A power-detecting, null-scanning, retrodirective antenna array for CubeSat platforms is presented. The system utilizes several hardware and software enhancements over previous retrodirective array architectures to address the size, weight, and power limitations of the CubeSat structure. Full-duplex retro-directivity is reported at 9.59 and 9.67 GHz for transmit and receive, respectively.

An interleaved, interelement phase-detecting/phase-shifting retrodirective antenna array for interference reduction is presented. This system uses two independent retrodirective subarrays to form a null in one direction while retrodirecting a beam in another direction, while also eliminating the R4 path loss of previous interleaved architectures. Retrodirectivity as well as null steering is reported at 2.4 GHz.

A full-duplex self-steering array using power detection and phase shifting is presented. The system utilizes two sub-arrays to autonomously steer its beam toward an interrogating signal. A two-element null-scanning array is used for power detection where the interrogator direction is determined by the location where minimum power is detected. Retrodirectivity is reported for angles of 0°, −30°, and +10° at a receive frequency of 7.31 GHz and a transmit frequency of 7.33 GHz.