Electronic device antennas having multiple operating modes

An electronic device, comprising:

• a housing having peripheral conductive structures;
• an antenna resonating element arm formed from a segment of the peripheral conductive structures that extends between first and second dielectric-filled gaps in the peripheral conductive structures;
• an antenna ground;
• an antenna feed having a positive antenna feed terminal coupled to the antenna resonating element arm and a ground antenna feed terminal coupled to the antenna ground;
• a first antenna tuning component coupled between a first location on the antenna resonating element arm and the antenna ground;
• and
• a second antenna tuning component coupled between a second location on the antenna resonating element arm and the antenna ground, wherein the positive antenna feed terminal is interposed between the first and second locations, a first portion of the antenna resonating element arm extending between the first dielectric-filled gap and the positive antenna feed terminal is configured to convey radio-frequency signals in a given frequency band while the first and second antenna tuning components are placed in a first tuning mode, a second portion of the antenna resonating element arm extending between the second location and the second dielectric-filled gap is configured to convey radio-frequency signals in the given frequency band while the first and second antenna tuning components are placed in a second tuning mode, and a third portion of the antenna resonating element arm extending between the first and second locations is configured to convey radio-frequency signals in the given frequency band while the first and second antenna tuning components are placed in a third tuning mode.

An electronic device comprising:

• an antenna resonating element arm;
• an antenna ground;
• an antenna feed having a positive antenna feed terminal coupled to the antenna resonating element arm and a ground antenna feed terminal coupled to the antenna ground;
• a first antenna tuning component coupled between a first location on the antenna resonating element arm and the antenna ground;
• a second antenna tuning component coupled between a second location on the antenna resonating element arm and the antenna ground;
• and
• control circuitry configured to adjust the first and second antenna tuning components between a first tuning mode in which the first antenna tuning component, a portion of the antenna ground, the second antenna tuning component, and a portion of the antenna resonating element arm are configured to resonate in a given frequency band and a second tuning mode in which the first antenna tuning component forms an open circuit between the antenna resonating element arm and the antenna ground.