Loop-feeding wireless area network (WAN) antenna for metal back cover

摘要

Antenna structures and methods of operating the same are described. One apparatus includes a metal cover having a first corner portion, a second corner portion, and an elongated portion. The elongated portion is physically separated from the first corner portion by a first cutout in the metal cover and the elongated portion is physically separated from the second corner portion by a second cutout in the metal cover. A radio frequency (RF) circuit is coupled to a feeding element that is coupled to the elongated portion. A capacitor is coupled between the feeding element and the first corner portion near the distal end of the feeding element. The RF circuit is operable to cause the feeding element, the elongated portion, and the first corner portion to radiate electromagnetic energy as a first radiator in a first frequency range with dual resonance.

主权项

1. An electronic device comprising:
a single radio frequency (RF) feed; RF circuitry coupled to the single RF feed; a metal cover comprising a middle strip element, a first corner ground element, and a second corner ground element disposed at a periphery of the metal cover, wherein the middle strip element is physically separated from the first corner ground element by a first cutout in the metal cover and the middle strip element is physically separated from the second corner ground element by a second cutout in the metal cover; and an antenna structure coupled to the RF feed, the antenna structure comprising a ground plane, a first antenna formed by a feeding element, the middle strip element and the first corner ground element, wherein:
the feeding element comprises:
a first section that extends from a feeding point at the RF feed in a first direction;a second section that extends from a distal end of the first section in a second direction perpendicular to the first direction; anda third section that extends from a distal end of the second section in the first direction and couples to a first end of the middle strip element, wherein the middle strip element extends in the second direction; andthe first corner ground element comprises:
a first section that extends from the ground plane in the first direction to form a first gap between the feeding element and the first corner ground element; anda second section that extends from a distal end of the first section of the first corner ground element in the second direction to form a second gap between the feeding element and the first corner ground element.