Tunable antenna system with receiver diversity

摘要

A wireless electronic device may include antenna structures and antenna tuning circuitry. The 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. The ground plane and the segments of the peripheral conductive member may form antennas in upper and lower portions of the housing. The antenna tuning circuitry may include switchable inductor circuits and variable capacitor circuits for the upper and lower antennas. The switchable inductor circuits associated with the upper antenna may be tuned to provide coverage in at least two high-band frequency ranges of interest, whereas the variable capacitor circuits associated with the upper antenna may be tuned to provide coverage in at least two low-band frequency ranges of interest.

主权项

1. An electronic device comprising:
a housing having a conductive member that runs around a periphery of the housing; an inverted-F antenna that is formed from an antenna ground and a portion of the conductive member, wherein the inverted-F antenna is configured to operate in a low-band frequency range centered at a first frequency and a high-band frequency range centered at a second frequency that is greater than the first frequency; and a switchable inductor coupled between the antenna ground and the portion of the peripheral conductive member, wherein the switchable inductor is configured to center the high-band frequency range at a third frequency that is greater than the first and second frequencies while the inverted-F antenna maintains operation in the low-band frequency range centered at the first frequency.