Branching filter and communication device

Details Branching filter and communication device Branching filter and communication device

2007-12-04

2007-12-04

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S187000, C333S189000

Reexamination Certificate

active

10520015

ABSTRACT:
A branching filter and a communication device have excellent characteristics and an optimized configuration of a transmitting filter and a receiving filter. The branching filter includes a transmitting filter and a receiving filter wherein piezoelectric thin film resonators including a piezoelectric thin film sandwiched between opposed electrodes are arranged in a ladder type configuration on an opening or a recess of a substrate. The transmitting filter and the receiving filter are connected in parallel to an antenna terminal. The piezoelectric thin film resonators defining the transmitting filter and the piezoelectric thin film resonators defining the receiving filter are different from each other.

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Official Communication issued in the corresponding Taiwanese Patent Application No. 094100384, mailed on Feb. 13, 2006.
Official Communication issued in the counterpart Japanese Application No. 2003-314646, mailed on Aug. 28, 2007.

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