| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antenna device for mobile telecommunication terminal, that is provided with a switch which can mechanically switch a bar-shaped antenna and a built-in antenna to each other, has a small size, and is less in signal loss. SOLUTION: This antenna device for mobile communication terminal uses the whip antenna (WA) and built-in antenna (LA) by switching. This device is provided with an impedance matching circuit (MC1), which is positioned between the bar-shaped antenna (WA) and a feeder circuit provided in the body of the antenna device and connects the antenna (WA) to the circuit, when the antenna (WA) is drawn out, a matching circuit (MC2) which has a higher impedance than the feeder circuit has and is connected to the grounding route of the antenna (WA), when the antenna (WA) is housed in the body, and the switch SW which is opened and closed in an interlocking way with the drawing- out and housing motions of the antenna (WA).</p> |
