HIGH FREQUENCY FILTER, COMMUNICATION MODULE, AND COMMUNICATION APPARATUS

WIPO Patent Application WO/2013/098998

A1

The purpose of the present invention is to provide a high frequency filter, which has a narrow passband width, and a high degree of suppression in the vicinity of the passband, and which also has low loss. This high frequency filter includes: a substrate; a first resonance circuit, a second resonance circuit, and a third resonance circuit, which are formed on the substrate; a first coupling circuit, a second coupling circuit, and a third coupling circuit, which are formed on the substrate; an input end having high frequency signals inputted thereto; and an output end having filtered high frequency signals outputted therefrom. The first resonance circuit is connected to the input end and to one end of the first coupling circuit, the second resonance circuit is connected to one end of the second coupling circuit, and the third resonance circuit is connected to the output end, and to one end of the third coupling circuit, and the other end of the first coupling circuit, the other end of the second coupling circuit, and the other end of the third coupling circuit are connected to each other.

MI XIAOYU (JP)
TOYODA OSAMU (JP)
UEDA SATOSHI (JP)
NAKAZAWA FUMIHIKO (JP)

PCT/JP2011/080425

July 04, 2013

December 28, 2011

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FUJITSU LTD (JP)
MI XIAOYU (JP)
TOYODA OSAMU (JP)
UEDA SATOSHI (JP)
NAKAZAWA FUMIHIKO (JP)

H03H7/075; H03H7/12; H03H11/10; H03H11/48

JP2005286893A	2005-10-13
JPS50105242A	1975-08-19
JPS519601A	1976-01-26
JP2000232330A	2000-08-22
JP2009165066A	2009-07-23

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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