Active isolation enhancement for multi-mode antenna system

An electronic device comprising:

• a multi-mode antenna system including a first antenna and a second antenna;
• and
• a controller configured to:
• in a first operating mode of the multi-mode antenna system,
• transmit a radio signal via the first antenna,
• actively de-tune the second antenna while receiving a reflected radio signal thereby increasing isolation between the first and second antennas,
• detect a presence of an object based at least on the reflected radio signal received by the second antenna, and
• based at least on detecting the presence of the object, switching the multi-mode antenna system to operation in a second operating mode, and
• in the second operating mode of the multi-mode antenna system,
• receive, via the first antenna, a first remote radio signal transmitted by a remote antenna of a remote electronic device,
• receive, via the second antenna, a second remote radio signal transmitted by the remote antenna of the remote electronic device, and
• determine a position of the remote electronic device based at least on a phase difference between the first remote radio signal received by the first antenna and the second remote radio signal received by the second antenna.

An electronic device comprising:

• a multi-mode antenna system including a first ultra-wide band (UWB) antenna and a second UWB antenna;
• and
• a controller configured to:
• in a radio detection and ranging (RADAR) operating mode of the multi-mode antenna system,
• transmit a radio signal via the first UWB antenna,
• actively de-tune the second UWB antenna while receiving a reflected radio signal thereby increasing isolation between the first and second UWB antennas,
• detect a presence of an object based at least on the reflected radio signal received by the second UWB antenna, and
• based at least on detecting the presence of the object, switching the multi-mode antenna system to operation in a phase difference on arrival (PDOA) operating mode, and
• in the PDOA operating mode of the multi-mode antenna system,
• receive, via the first UWB antenna, a first remote radio signal transmitted by a remote antenna of a remote electronic device,
• receive, via the second UWB antenna, a second remote radio signal transmitted by the remote antenna of the remote electronic device, and
• determine a position of the remote electronic device based at least on a phase difference between the first remote radio signal received by the first UWB antenna and the second remote radio signal received by the second UWB antenna.