Patent ID: 8699964
Filing Date: 2014-04-15
Classification: H01Q,H04B

Abstract:
1. An antenna apparatus comprising: a first antenna element comprising a forward part, a folded part and a backward part, the forward part comprising a start point connected to a feeding point, the folded part connecting the forward part and the backward part, and the backward part comprising an end point connected to ground; a first lumped constant element inserted in the backward part; a switch configured to select a current path in accordance with a control signal; and a plurality of second lumped constant elements where one of the plurality of second lumped constant elements to be selectively connected in parallel to the first lumped constant element through the switch, wherein the switch is configured to connect at least a particular second lumped constant element of the plurality of second lumped constant elements in parallel to the first lumped constant element in order to lower a resonant frequency of the first antenna element, and to connect a different second lumped constant element of the plurality of second lumped constant elements in parallel to the first lumped constant element in order to raise the resonant frequency of the first antenna element.