Patent ID: 7116966

Claim:
A transceiving filter device comprising: a first transmission path and a second transmission path between a first port for connection to an antenna and a second port for connection to a transceiving circuit, the first transmission path including: an amplification circuit that amplifies a received signal; a receiving filter disposed at an input side of the amplification circuit that allows a receiving-frequency-band signal to pass and stops a transmission signal; and a circuit having directivity disposed at an output side of the amplification circuit; the second transmission path including a transmitting filter that allows the transmission signal to pass and that stops the receiving-frequency-band signal, and wherein the circuit having directivity transmits the received signal amplified by the amplification circuit to the second port and transmits the transmission signal input from the second port to the second transmission path, the circuit having directivity including: at least two 90° hybrid circuits; two band pass filters having similar characteristics to each other and that pass the receiving-frequency-band-signal and stop the transmission signal; and a termination resistor that terminates a portion of the received signal amplified by the amplification circuit, wherein output ports of the two band pass filters are connected in parallel to a first 90° hybrid circuit of the at least two 90° hybrid circuits, and input ports of the two band pass filters are connected in parallel to a second 90° hybrid circuit of the at least two 90° hybrid circuits.