ANTENNA BRANCHING FILTER

WIPO Patent Application WO/2014/061694

A1

Provided is an antenna branching filter having a suppressed intermodulation distortion. The antenna branching filter (100) is provided with: an antenna terminal (Ant.); a first filter circuit (1) having a first pass-band; and a second filter circuit (2) having a second pass-band that does not include the first pass-band and that is a frequency band higher than the first pass-band. The antenna terminal (Ant.), the first filter circuit (1), and the second filter circuit (2) are connected at a first connection point (J1); the second filter circuit (2) is provided with vertically coupled resonator-type filter circuits (2A, 2B); resonators (3A, 3B) are inserted between the first connection point (J1) and the vertically coupled resonator-type filter circuits (2A, 2B); and low-frequency-bandpass circuits (4A, 4B) having a stopband at the second pass-band are inserted between the ground potential and second connection points (J2A, J2B), which are the connection points of the resonators (3A, 3B) and the vertically coupled resonator-type filter circuits (2A, 2B).

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WATANABE KAZUSHI (JP)

PCT/JP2013/078051

April 24, 2014

October 16, 2013

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MURATA MANUFACTURING CO (JP)

H03H9/72; H03H7/46; H03H9/64

WO2012108254A1	2012-08-16
WO2010038381A1	2010-04-08
WO2011089110A1	2011-07-28
WO2012114593A1	2012-08-30

JP2004088778A	2004-03-18
JP2006157174A	2006-06-15
JP2007189747A	2007-07-26
JP2007336479A	2007-12-27
JP2012085279A	2012-04-26

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