Patent ID: 6864848

Claim:
A slot antenna for receiving and/or transmitting a RF signal at a desired one of a plurality of different frequencies, the slot antenna comprising: (a) at least one conductive sheet having a slot defined therein, the slot being longer than it is wide, the slot having a first end which is electrically closed and a second end which is open; (b) a plurality of switch members mounted along said slot closer to the second end than to the first end thereof, each of said plurality of switch members acting, when closed, to couple the at least one conductive sheet on one side of said slot to the at least one conductive sheet on a second side thereof; (c) a feed point for coupling an RF signal to and/or from the at least one conductive sheet, the feed point being disposed adjacent said slot at a location which is nearer to said first end than it is to a closer or closest one of said plurality of switch members; and (d) the plurality of switch members be closable in a controlled manner to change a desired resonance frequency at which the slot antenna receives and/or transmits the RF signal.