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A retrodirective array for use in secure picosatellite networks is presented. This is the first reported array that uses quadruple subharmonic mixing which relaxes the requirements on a high-frequency local oscillator. The array demonstrates circular polarization and two-dimensional retrodirectivity for a free-floating satellite environment. Bistatic radiation-pattern measurements demonstrate the effectiveness of the design.

A high-directivity transponder system based on self-steering arrays is introduced. The system consists of retrodirective and self-null-steering arrays. When interrogated, the retrodirective array steers a beam containing data toward the interrogator, while the null-steering array points a null toward the interrogator and a jamming signal in all other directions. The system effectively provides super-high directivity, disabling interception.