Multiplexed antenna circuit network for ultra-high frequency low energy based phone as a key access to a vehicle

A system comprising:

• an actuator;
• and
• a body control module comprising
• a first multiplexer connected to a first plurality of antenna circuits, wherein the antenna circuits are separate from the body control module and are disposed in respective locations on a vehicle, each of the first plurality of antenna circuits having a respective antenna and a respective passive circuit, the plurality of antenna circuits being void of transceivers,
• a first transceiver connected to the first multiplexer and configured to cycle through the first plurality of antenna circuits to facilitate determination of a location of a portable access device relative to the vehicle, wherein the first transceiver is configured to, for each of the first plurality of antenna circuits, exchange radio frequency signals with the portable access device to obtain at least one of (i) timing information associated with transmission of the radio frequency signals, (ii) received signal strength indicator information associated with transmission of the radio frequency signals, or (iii) range estimates of the portable access device relative to the vehicle, wherein the range estimates are estimates of distances between the first plurality of antenna circuits and the portable access device, and wherein the location is determined based on the at least one of the timing information, received signal strength indicator information or the range estimates, and
• an access module configured to, based on the determined location, control the actuator to provide at least one of access to the vehicle or control of a vehicle system.