Patent ID: 6501431
Filing Date: 2002-12-31
Classification: H01Q

Abstract:
An apparatus, comprising:a conductive section having a recess which includes a balun portion and an elongate slot portion, said slot portion communicating at one end with said balun portion; an elongate conductive element which extends generally transversely with respect to said slot portion in the region of said one end thereof; a capacitive element having first and second terminals which are respectively coupled to said conductive section at spaced first and second locations disposed along a periphery of said balun portion, said capacitive element being selectively operable in one of first and second modes in which said capacitive element respectively has first and second capacitances that are substantially different, wherein in said first mode said balun portion and said capacitive element collectively have a first effective impedance and in said second mode said balun portion and said capacitive element collectively have a second effective impedance different from said first effective impedance.