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1. (WO2010111783) TUNABLE INVERTED F ANTENNA

Pub. No.:    WO/2010/111783    International Application No.:    PCT/CA2010/000490
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Thu Apr 01 01:59:59 CEST 2010
IPC: H01Q 9/04
H01Q 1/38
G08B 25/10
H04W 4/00
Applicants: TYCO SAFETY PRODUCTS CANADA LTD.
WILSON, David
Inventors: WILSON, David
Title: TUNABLE INVERTED F ANTENNA
Abstract:
A planar antenna includes a ground plane on a substrate, a radiating element coupled to the ground plane on the substrate, and a feed line. An impedance tap point is defined by a connection between the feed line and the radiating element and the length of the radiating element defines the resonant frequency of the antenna. A first portion of the radiating element includes an impedance adjustment mechanism for defining the impedance tap point of the antenna and consequently the impedance of the antenna. A second portion of the radiating element includes a frequency adjustment section which adjusts the length of said radiating element and consequently the resonant frequency of the antenna.