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Title:
POWER RESISTANT SAW FILTER DEVICE
Document Type and Number:
Japanese Patent JP2013165347
Kind Code:
A
Abstract:

To provide a power resistant SAW filter device that can secure isolation among SAW filter elements so as not to influence other filters.

In a power resistant SAW filter device, on the input side of a plurality of SAW filters 21 to 2N, 10log(1/N)dB coupler 1N, 10log(1/(N-1))dB coupler 1(N-1), ..., -4.7 dB(10log(1/3)dB) coupler 13, -3 dB(10log(1/2)dB) coupler 12 are cascaded to distribute and output to the SAW filters 21 to 2N, respectively, on the output side of the plurality of SAW filters 21 to 2N, -3 dB coupler 32, -4.7 dB coupler 33, ..., 10log(1/(N-1))dB coupler 3(N-1), 10log(1/N)dB coupler 3N are cascaded to combine and output the outputs from the SAW filters 21 to 2N, respectively.


Inventors:
ONZUKA TATSUNORI
Application Number:
JP2012026530A
Publication Date:
August 22, 2013
Filing Date:
February 09, 2012
Export Citation:
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Assignee:
NIHON DEMPA KOGYO CO
International Classes:
H03H9/25; H03H7/48; H03H7/52; H03H9/64
Attorney, Agent or Firm:
Nobuhiro Funatsu