Duplexer and communication device

Details Duplexer and communication device Duplexer and communication device

2007-03-07

2010-10-05

Lee, Andrew (Department: 2472)

Multiplex communications

Duplex

Transmit/receive interaction control

C333S132000

Reexamination Certificate

active

07808935

ABSTRACT:
Provided is a demultiplexer capable of improving attenuation characteristic and isolation characteristic of a filter having a lower transmission frequency band among two filters having different transmission frequency bands, outside the transmission frequency band of a high-frequency side. A communication device using the demultiplexer is also disclosed. A first spiral wiring portion (55) and a sixth wiring portion (56) are formed so that an angle defined by a direction of a part (L1) of the first spiral wiring portion (55) and a direction of a part (L2) of the sixth spiral wiring portion (56) on a predetermined virtual plane is, for example, 0 degree and the direction of the current flowing in the part (L1) of the first spiral wiring portion (55) is opposite to the direction of the current flowing in the part (L2) if the sixth wiring portion (56).

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