Antenna System with Antenna Swapping and Antenna Tuning

摘要

Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and first and second antennas. An electronic device may include a housing. The first antenna may be located at an upper end of the housing and the second antenna may be located at a lower end of the housing. A peripheral conductive member may run around the edges of the housing and may be used in forming the first and second antennas. The radio-frequency transceiver circuitry may have a transmit-receive port and a receive port. Switching circuitry may connect the first antenna to the transmit-receive port and the second antenna to the receiver port or may connect the first antenna to the receive port and the second antenna to the transmit-receive port.

主权项

1. An electronic device, comprising:
a housing having conductive structures that form an antenna ground and having peripheral conductive housing structures that run around at least four edges of the housing; a loop antenna that is formed from the antenna ground and a first segment of the peripheral conductive housing structures; an inverted-F antenna that is formed form the antenna ground and a second segment of the peripheral conductive housing structures; radio-frequency transceiver circuitry having first and second ports; switching circuitry that is operable in a first mode in which the loop antenna is coupled to the first port and the inverted-F antenna is coupled to the second port and that is operable in a second mode in which the loop antenna is coupled to the second port and the inverted-F antenna is coupled to the first port, wherein the radio-frequency transceiver circuitry is configured to:
transmit and receive radio-frequency signals through the loop antenna in a plurality of cellular telephone communications bands during the first mode; andonly receive radio-frequency signals through the inverted-F antenna in a subset of the plurality of cellular telephone communications bands during the first mode.