Full-duplex beam-nulling isolation beween transmit and receive arrays

A method for mitigating self-interference at a transceiver of a phased array antenna system, comprising:

• identifying a first signal for transmission via a transmit array of the phased array antenna system and a second signal for reception via a receive array of the phased array antenna system, wherein the receive array and the transmit array are located proximate to each other in the phased array antenna system;
• determining first beam weights for transmission of the first signal towards a first target direction via the transmit array and second beam weights for reception of the second signal from a second target direction via the receive array, wherein one or more of the first beam weights or the second beam weights generate a respective null in one or more directions between the transmit array and the receive array, wherein determining the second beam weights comprises:
• determining a first subset of the second beam weights for a first subset of receive antenna elements of the receive array and a second subset of the second beam weights for a second subset of receive antenna elements of the receive array, the first subset of receive antenna elements comprising one or more antenna elements located closest to the transmit array, wherein the first subset of the second beam weights are determined to generate the respective null in the one or more directions between the transmit array and the receive array, and wherein the second subset of the second beam weights are determined to orient a primary lobe of a beam in the second target direction, and
• combining the first subset of the second beam weights with the second subset of the second beam weights;
• transmitting the first signal via the transmit array according to the first beam weights;
• and
• receiving, at least partially concurrently with transmitting the first signal, the second signal via the receive array according to the second beam weights.

A phased array antenna system comprising:

• a transmit array;
• a receive array, wherein the receive array and the transmit array are located proximate to each other in the phased array antenna system;
• a signal manager configured to identify a first signal for transmission via the transmit array and a second signal for reception via the receive array;
• a beam manager configured to determine first beam weights for transmission of the first signal towards a first target direction via the transmit array and second beam weights for reception of the second signal from a second target direction via the receive array wherein one or more of the first beam weights or the second beam weights generate a respective null in one or more directions between the transmit array and the receive array, wherein, to determine the first beam weights, the beam manager is configured to:
• determine a first subset of the first beam weights for a first subset of transmit antenna elements of the transmit array and a second subset of the first beam weights for a second subset of transmit antenna elements of the transmit array, the first subset of transmit antenna elements comprising one or more antenna elements located closest to the receive array, wherein the first subset of the first beam weights are determined to generate the respective null in the one or more directions between the transmit array and the receive array, and wherein the second subset of the first beam weights are determined to orient a primary lobe of a beam in the first target direction, and
• combine the first subset of the first beam weights with the second subset of the first beam weights;
• a transmitter configured to transmit the first signal via the transmit array according to the first beam weights;
• and
• a receiver configured to receive, at least partially concurrently with transmitting the first signal, the second signal via the receive array according to the second beam weights.

A phased array antenna system comprising:

• a transmit array;
• a receive array, wherein the receive array and the transmit array are located proximate to each other in the phased array antenna system;
• a signal manager configured to identify a first signal for transmission via the transmit array and a second signal for reception via the receive array;
• a beam manager configured to determine first beam weights for transmission of the first signal towards a first target direction via the transmit array and second beam weights for reception of the second signal from a second target direction via the receive array wherein one or more of the first beam weights or the second beam weights generate a respective null in one or more directions between the transmit array and the receive array, wherein, to determine the second beam weights, the beam manager is configured to:
• determine a first subset of the second beam weights for a first subset of receive antenna elements of the receive array and a second subset of the second beam weights for a second subset of receive antenna elements of the receive array, the first subset of receive antenna elements comprising one or more antenna elements located closest to the transmit array, wherein the first subset of the second beam weights are determined to generate the respective null in the one or more directions between the transmit array and the receive array, and wherein the second subset of the second beam weights are determined to orient a primary lobe of a beam in the second target direction, and
• combine the first subset of the second beam weights with the second subset of the second beam weights;
• a transmitter configured to transmit the first signal via the transmit array according to the first beam weights;
• and
• a receiver configured to receive, at least partially concurrently with transmitting the first signal, the second signal via the receive array according to the second beam weights.