ANTENNA AND WIRELESS COMMUNICATION DEVICE

摘要

An antenna and a wireless communication device in which a plurality of resonant frequencies can be changed simultaneously by a desired range at a low voltage are provided. An antenna 1 includes a first antenna section 2 and a second antenna section 3. The first antenna section 2 is formed of a feeding electrode 5, a frequency-changing circuit 4, and a radiating electrode 6, and the second antenna section 3 is formed of the feeding electrode 5, a first reactance circuit 4a, and an additional radiating electrode 7. The frequency-changing circuit 4 has a circuit configuration in which the first reactance circuit 4a and the second reactance circuit 4b are connected. When a control voltage Vc is applied to a node P, the reactances of the first and second reactance circuits 4a and 4b change in accordance with the magnitude of the control voltage Vc, so that a resonant frequency f1 of the first antenna section 2 and a resonant frequency f2 of the second antenna section 3 change simultaneously.