Loosely-coupled radio antenna apparatus and methods

摘要

A multiband internal 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 device enclosure is fabricated from a conductive material and has two parts: the main portion, housing the device electronics and ground plane, and the antenna cap, which substantially envelops a directly fed radiator structure of the antenna. Electromagnetic coupling of the cap portion to the device feed effects formation of a parasitic antenna radiator in a lower frequency band. The cap portion is separated from the main portion by a narrow gap, extending along circumference of the device, and is grounded at a location selected to cause desired resonance and to widen antenna bandwidth. In one implementation, a second parasitic radiator is disposed proximate the directly feed radiator to further expand antenna frequency bands of operation.

主权项

1. A communications device, comprising:
a metallic device enclosure comprising a main portion, a first antenna cover portion, and a second antenna cover portion, the first and second antenna cover portions disposed on opposing sides of the metallic device enclosure and separated from the main portion by a gap extending along the circumference of the communications device, the main portion connected to a ground at one or more predetermined locations; a main antenna radiator disposed on a first end of the metallic device enclosure enclosed within the first antenna cover portion, the main antenna radiator comprising a C-element and a feed element connected to a feed structure of the communications device, the first antenna cover portion electromagnetically coupled to the feed element in order to form a parasitic antenna resonator, the main antenna radiator folded such that the feed element is disposed perpendicular to the C-element within the metallic device enclosure; and a multiple-input multiple-output (MIMO) antenna radiator disposed on a second end of the metallic device enclosure, the MIMO antenna radiator being enclosed within the second antenna cover portion; wherein the first and second ends are disposed on opposing sides of the metallic device enclosure.