| 摘要 |
There is provided a small-sized switch apparatus for switching between signal paths of at least a first, second and third frequency bands, which is capable of handling high-powered high-frequency signals with a relatively low control voltage, and also a mobile terminal apparatus employing this. A first signal terminal of a diplexer (1) is connected to an antenna terminal Tant, and a second signal terminal is connected to a high-frequency switch (4) via a filter (2). A third signal terminal of the diplexer is connected to a high-frequency switch (50) via a filter (3). The high-frequency switch (4) has PIN diodes D1 and D2 as switching devices, and performs switching between a GSM transmission signal and a GSM reception signal. The high-frequency switch (50) has three sets of serially connected multi-staged FETs (31) through (33), (21) through (23) and (31) through (33) as switching devices, and performs switching between WCDMA transmission/reception signals, a DCS transmission signal and a DCS reception signal.
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