Multi-feed antenna apparatus and methods

摘要

A space efficient multi-feed antenna apparatus, and methods for use in a radio frequency communications device. In one embodiment, the antenna assembly comprises three (3) separate radiator structures disposed on a common antenna carrier. Each of the three antenna radiators is connected to separate feed ports of a radio frequency front end. In one variant, the first and the third radiators comprise quarter-wavelength planar inverted-L antennas (PILA), while the second radiator comprises a half-wavelength grounded loop-type antenna disposed in between the first and the third radiators. The PILA radiators are characterized by radiation patterns having maximum radiation axes that are substantially perpendicular to the antenna plane. The loop radiator is characterized by radiation pattern having axis of maximum radiation that is parallel to the antenna plane. The above configuration of radiating patterns advantageously isolates the first radiator structure from the third radiator structure in at least one frequency band.

主权项

1. A triple-feed antenna apparatus, comprising:
a first antenna element operable in a lower frequency band and comprising a first feed portion configured to be coupled to a first feed port; a second antenna element operable in a second frequency band and comprising a second feed portion configured to be coupled to a second feed port; a third antenna element operable in an upper frequency band and comprising a third feed portion configured to be coupled to a third feed port; and a ground plane, the ground plane disposed so as to reside substantially beneath the first, second, and third antenna elements; wherein:
the first and third antenna elements are each configured to form a radiation pattern disposed primarily in a first orientation;the second antenna element is configured to form a radiation pattern disposed primarily in a second orientation that is substantially orthogonal to the first orientation; andthe second antenna element comprises a loop structure configured to have a radiator branch disposed within the loop structure, the radiator branch configured to resonate at a frequency that expands an operational frequency range of the second frequency band.