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 loop antenna; a two-branch inverted-F antenna; 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;the radio-frequency transceiver circuitry is configured to only receive radio-frequency signals through the inverted-F antenna in a subset of the plurality of cellular telephone communications bands during the first mode;the radio-frequency transceiver circuitry is configured to only receive radio-frequency signals through the loop antenna in the plurality of cellular telephone communications bands during the second mode; andthe radio-frequency transceiver circuitry is configured to transmit and receive radio-frequency signals through the inverted-F antenna in another subset of the plurality of cellular telephone communications bands during the second mode; a tunable matching circuit interposed between the first antenna and the switching circuitry; a housing having upper and lower ends and four edges, wherein the inverted-F antenna is located at the upper end and the loop antenna is located at the lower end; and a peripheral conductive member that runs along the four edges of the housing, wherein the peripheral conductive member has at least two dielectric-filled gaps that separate the peripheral conductive member into at least first and second segments, the inverted-F antenna is formed from at least part of the first segment and the loop antenna is formed from at least part of the lower segment, the peripheral conductive member runs across at least four exterior surfaces of the electronic device, the electronic device has a length, a width perpendicular to the length, and a height perpendicular to the width and the length, the width is less than the length and the height is less than the width, and the at least two dielectric-filled gaps extend across the height of the electronic device from a rear face of the electronic device to a front face of the electronic device.