Transceiving filter and communication device

Details Transceiving filter and communication device Transceiving filter and communication device

2007-06-26

2007-06-26

Patel, Jay K. (Department: 2611)

Pulse or digital communications

Transceivers

C455S073000, C455S078000, C455S083000, C455S334000

Reexamination Certificate

active

10716433

ABSTRACT:
First and second transmission paths are provided between a first port to which an antenna is connected and a second port to which a transceiving circuit is connected. First to fourth reception filters, an amplifier circuit, and first to fourth hybrid circuits are provided on the first transmission path. A reception signal from the antenna is transmitted from the first port to the second port via the first hybrid circuit, the first and second reception filters, the second hybrid circuit, the amplifier circuit, the third hybrid circuit, the third and fourth reception filters, and the fourth hybrid circuit 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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