| 摘要 |
An inverted-F antenna is provide, which is capable of coping with the change of available frequency bands while keeping its compactness. This antenna is comprised of a radiating element for radiating or receiving an RF signal, a ground conductor arranged to be opposite to the radiating element with a specific gap, a feeding terminal electrically connected to the radiating element, a first grounding terminal electrically connected to the radiating element, at least one impedance element provided in a line connecting the first grounding terminal to the ground conductor, and a first switch for selectively inserting the at least one impedance element into the line. A resonant frequency of the antenna is changed by operating the first switch. As the at least one impedance element, an inductance or capacitance element is used. Preferably, a second grounding terminal electrically connected to the radiating element through a second switch is further provided.
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