Patent ID: 8089412
Filing Date: 2012-01-03
Classification: H01Q,H04B

Abstract:
1. An antenna device comprising: a conductive ground plane; an antenna including a radiating element; at least one variable capacitor having a first end connected to the conductive ground plane; a plurality of switch elements having respective first ends connected to a second end of said at least one variable capacitor and respective second ends connected to the antenna at different locations; a switch controlling unit configured to control an ON/OFF state of each of the switch elements; and a capacitor controlling unit configured to control a capacitance of said at least one variable capacitor; an operation setup table configured to hold operating frequencies of the antenna, each corresponding to a combination between a capacitance level of said at least one variable capacitor and ON/OFF states of the switch elements; and a detecting unit configured to detect one combination corresponding to a desired operating frequency from among the combinations in the operation setup table, wherein the capacitor controlling unit controls said at least one variable capacitor in accordance with the detected combination, and the switch controlling unit controls the switch elements in accordance with the detected combination.