Duplexer

一种双工器、接收滤波器的技术，应用在使用表面声波的双工器领域，能够解决不适于SAW滤波器的相位匹配电路等问题，达到低带内插入损耗、尺寸小、高绝缘特性的效果
CN1770628AInactive Publication Date: 2006-05-10TAIYO YUDEN KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIYO YUDEN KK
Publication Date
2006-05-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A duplexer includes: a transmission filter and a reception filter connected to a common terminal; and a reactance circuit connected to at least one of the transmission filter and the reception filter. The reactance circuit includes an insulating substrate, a lumped constant inductance and at least one capacitor, the lumped constant inductance and the at least one capacitor being directly formed on the surface of the insulating substrate.
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Description

technical field

[0001] The present invention generally relates to a duplexer, and more particularly, to a duplexer using surface acoustic waves (SAW). Background technique

[0002] Antenna duplexers with surface acoustic wave (SAW) filters are installed on most mobile phone handsets today in order to separate transmit and receive signals from other signals. Each SAW duplexer includes a transmit SAW filter, a receive SAW filter, and a matching circuit interposed between the receive filter and the junction of the transmit filter and receive filter. This matching circuit is provided for directing each transmit signal from the transmit filter to the antenna terminal and for preventing each transmit signal from flowing into the receive filter. Usually, as figure 1 As shown, the matching circuits are formed from distributed constant lines such as microstrip or striplines. The microstrip line or stripline can be incorporated into the package on which the SAW filter is to be moun...

Claims

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