Multiband slot loop antenna apparatus and methods

摘要

A multiband slot loop antenna apparatus, and methods of tuning and utilizing the same. In one embodiment, the antenna configuration is used within a handheld mobile device (e.g., cellular telephone or smartphone). The antenna comprises two radiating structures: a ring or loop structure substantially enveloping an outside perimeter of the device enclosure, and a tuning structure disposed inside the enclosure. The ring structure is grounded to the ground plane of the device so as to create a virtual portion and an operating portion. The tuning structure is spaced from the ground plane, and includes a plurality of radiator branches effecting antenna operation in various frequency bands; e.g., at least one lower frequency band and three upper frequency bands. On one implementation, a second lower frequency band radiator is effected using a reactive matched circuit coupled between a device feed and a radiator branch.

主权项

1. A multiband antenna apparatus for use in a portable radio communications device, the antenna apparatus comprising:
a first antenna structure comprising an element configured to be disposed around an external surface of a device enclosure; wherein:
the first antenna structure is connected to a ground plane of the device in at least two locations in order to form a virtual portion and an operational portion; andthe operational portion comprises a slot formed in the element so as to be disposed proximate a bottom side of the device enclosure, the slot further dividing the operational portion into a longer section and a shorter section; and a plurality of tuning branches with at least one of the tuning branches coupled to a feed port of the portable radio communications device, the plurality of tuning branches collectively configured to effectuate a plurality of resonances within the longer section and the shorter section of the operational portion.