| 摘要 |
First and second transmission paths (P1, P2) are provided between a first port (#1) to which an antenna is connected and a second port (#2) to which a transceiving circuit (100) is connected. First to fourth reception filters (Rxa, Rxb, Rxc, Rxd), an amplifier circuit (LNA), and first to fourth hybrid circuits (11, 12, 13 14) are provided on the first transmission path. A reception signal from the antenna is transmitted from the first port (#1) to the second port (#2) via the first hybrid circuit (11), the first and second reception filters (Rxa, Rxb), the second hybrid circuit (12), the amplifier circuit (LNA), the third hybrid circuit (13), the third and fourth reception filters (Rxc, Rxd), and the fourth hybrid circuit (14) in this order. This reception signal does not return to the amplifier circuit, whereby the reception signal is prevented from oscillating due to positive feedback.
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