| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna apparatus capable of suppressing low the communication performance deterioration due to an interference wave becoming strong, while using a low-noise amplifier. SOLUTION: An antenna element 10 is connected to a first system for complex conjugate matching with a low-noise amplifier 15 and to a second system for impedance matching using a plurality of matching circuits 12-1 to 12-n via an SPmT switch 11. The first and second systems are connected to a tuner 17 via a changeover switch 16 and the SPmT switch 11, and the changeover switch 16 selectively switch the first system and the second system according to the input of the low-noise amplifier 15. As a result, while the low-noise amplifier 15 is used, communication performance deterioration due to an interference wave becoming strong can be suppressed to a low level. COPYRIGHT: (C)2011,JPO&INPIT
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