Abstract: Baluns and antenna devices that achieve improved antenna isolation for simultaneous transmit and receive (STAR) antennas are provided. A tunable balun can be used to compensate for amplitude imbalances in a multi-antenna radio, and/or an antenna agnostic feed network can be used to improve isolation in a single antenna radio. The balun can be integrated directly into the antenna. The balun can control the amplitude of each signal to ensure they are equal, resulting in greater transmitter interference cancellation.

Abstract: Feed networks and methods of using the same to achieve high levels of self-interference cancellation (SIC) in Simultaneous Transmit and Receive (STAR) systems are provided. SIC at the antenna feed network alone can be as high as 100 dB. This can be done by employing entirely low-cost, low-profile passive circuits. The feed network creates a perfect anti-phase path that cancels the high power self-interference signal at the receive port.

Abstract: Feed networks and methods of using the same to achieve high levels of self-interference cancellation (SIC) in Simultaneous Transmit and Receive (STAR) systems are provided. SIC at the antenna feed network alone can be as high as 100 dB. This can be done by employing entirely low-cost, low-profile passive circuits. The feed network creates a perfect anti-phase path that cancels the high power self-interference signal at the receive port.

Abstract: Example systems and methods described herein relate to radio communication architectures and techniques for beamforming and down-conversion without a priori knowledge of the source location or frequency. An example radio receiver includes a plurality of antenna elements that include a first element, a second element, and a third element. The radio receiver also includes a plurality of mixers coupled to the plurality of antenna elements and a combiner coupled to the plurality of antenna elements. A signal incident on the first element is mixed with itself via a first mixer of the plurality of mixers. An output of the first mixer is mixed with a signal incident on the second element via a second mixer of the plurality of mixers, and an output of the second mixer is combined via the combiner with a signal incident on the third element.

Abstract: Example systems and methods described herein relate to radio communication architectures and techniques for beamforming and down-conversion without a priori knowledge of the source location or frequency. An example radio receiver includes a plurality of antenna elements that include a first element, a second element, and a third element. The radio receiver also includes a plurality of mixers coupled to the plurality of antenna elements and a combiner coupled to the plurality of antenna elements. A signal incident on the first element is mixed with itself via a first mixer of the plurality of mixers. An output of the first mixer is mixed with a signal incident on the second element via a second mixer of the plurality of mixers, and an output of the second mixer is combined via the combiner with a signal incident on the third element.