| 摘要 |
<p>A plane antenna applicable to a portable telephone, and the like, in which impedance mismatching loss is reduced in a short time when set close to a human body such as during telephone conversation. A plane antenna element (101) is connected, at a position on the circumferential edge part of the antenna element capable of controlling the resonance frequency, with a ground plate (104) through a first variable capacitance element (102) for principally controlling the resonance frequency. The plane antenna element (101) is connected, at a position capable of controlling the voltage standing wave ratio in the resonance frequency, with the ground plate (104) through a second variable capacitance element (103) for principally controlling the voltage standing wave ratio in the resonance frequency. The plane antenna element (101) is connected, at a feeding section (105), with a feeder (106). Good communication quality can be ensured by controlling the capacitances of the first variable capacitance element (102) and the second variable capacitance element (103) and therefore by regulating the resonance frequency, deviated when set close to a human body such as during telephone conversation, to working frequency, thereby reducing the mismatching loss.</p> |
