Same Frequency Simultaneous Transmit and Receive Radio

The objective of this proposal is to enable operationally relevant same-frequency simultaneous transmit and receive (SF-STAR) communications systems, through enhanced jammer and self-interference suppression in the RF domain. Best-in-class isolation (>80dB), bandwidth (>500 MHz), and nearby jammer suppression (20dB) have already been demonstrated by the proposing team. This game-changing capability leverages highly orthogonal wideband multi-feed antennas and analog self-interference filtering techniques, developed over the past 3 years as the subject of $1.4M+ of research funding. The proposed solution utilizes passive, analog design, lending itself to maximum linearity, with a high level of integration and miniaturization, as well as platform-agnostic implementation. The Phase I effort will include comparative analysis of SF-STAR approaches, and system simulation to establish operating margins and implementation feasibility of the selected architecture.