Single-feed, multi-band, virtual two-antenna assembly having the radiating element of one planar inverted-F antenna (PIFA) contained within the radiating element of another PIFA

摘要

A unitary assembly provides two virtual planar inverted-F antennas (PIFAs) within a physical volume that is occupied by one of the PIFAs. The virtual two-antenna assembly includes a single RF feed, and provides multiple frequency response in the AMPS, PCS, GSM, DCS and GPS frequency bands. A composite radiating element is supported above a ground plane. A C-shaped slot divides the composite radiating element into an outer radiating element and an inner radiating element. Two metal stubs within a slot-discontinuity of the C-shaped slot physically and electrically connect the outer radiating element to the inner radiating element. An RF feed post connects to the outer radiating element, and both of the inner and outer radiating elements are shorted to the ground plane. One metal stub provides virtual RF feed to the inner radiating element, the other metal stub provides a matching and/or tuning function to the inner radiating element, and the two metal stubs provide a matching and/or tuning function to the outer radiating element. The outer radiating element includes an L-shaped slot, and the inner radiating element includes a linear slot. Reactive loading plates extend from the composite radiating element toward the ground plane.