Antenna system with receiver diversity and tunable matching circuit

摘要

Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. An electronic device may include a display mounted within a housing. A peripheral conductive member may run around the edges of the display and housing. Dielectric-filled gaps may divide the peripheral conductive member into individual segments. A ground plane may be formed within the housing from conductive housing structures, printed circuit boards, and other conductive elements. The ground plane and the segments of the peripheral conductive member may form antennas in upper and lower portions of the housing. The radio-frequency transceiver circuitry may implement receiver diversity using both the upper and lower antennas. The lower antenna may be used in transmitting signals. The upper antenna may be tuned using a tunable matching circuit.

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 some edges of the housing; radio-frequency receiver circuitry; an inverted-F antenna that is formed from the antenna ground and an inverted-F antenna resonating element that is separated from the antenna ground by an opening, wherein the inverted-F antenna resonating element is formed from a segment of the peripheral conductive housing structures that is located between first and second gaps in the peripheral conductive housing structures, a first antenna feed terminal is coupled to the segment, and a second antenna feed terminal is coupled to the antenna ground; and an additional antenna, wherein the additional antenna is configured to transmit and receive radio-frequency signals in a plurality of cellular telephone bands, and wherein the receiver circuitry is configured to only receive radio-frequency signals in a subset of the plurality of cellular telephone bands over the inverted-F antenna.