Electronic Device Antenna with Switchable Resonant Circuit

An electronic device comprising:

• peripheral conductive housing structures having a gap that divides the peripheral conductive housing structures into first and second segments, the first segment having a bend at a corner of the electronic device;
• a display mounted to the peripheral conductive housing structures;
• a conductive plate opposite the display;
• a slot that separates the conductive plate from the first and second segments;
• a conductive interconnect coupling a first point on the first segment to a second point on the conductive plate, the slot having an open end defined by the gap and having an opposing closed end defined by the conductive interconnect;
• and
• an antenna that includes
• a positive antenna feed terminal coupled to the first segment, and
• an LC resonator coupled between a third point on the first segment and a fourth point on the conductive plate, the third point being interposed on the first segment between the positive antenna feed terminal and the gap, and the positive antenna feed terminal being interposed on the first segment between the first and third points.

An antenna comprising:

• a ground structure;
• a conductive arm;
• a fixed conductive path coupling a first point on the conductive arm to a second point on the ground structure;
• a switch coupled to a third point on the conductive arm;
• an inductor;
• a capacitor coupled in series with the inductor between the switch and a fourth point on the ground structure;
• a near-field communications (NFC) antenna feed, the third point forming a feed terminal of the NFC feed;
• and
• a non-NFC antenna feed that includes a positive antenna feed terminal interposed on the conductive arm between the first and third points.