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Patent Searching and Data


Title:
DIRECTIONAL COUPLER
Document Type and Number:
WIPO Patent Application WO/2012/017713
Kind Code:
A1
Abstract:
Sub-lines (or main lines) in a directional coupler are electromagnetically coupled, and isolation characteristics deteriorate. A directional coupler having improved isolation characteristics is provided. Adding capacitance (C1) between sub-lines (S1, S2) (or between main lines) polarizes the isolation characteristics , and improves the isolation characteristics of the directional coupler.

Inventors:
TAMARU IKUO (JP)
YAZAKI HIROKAZU (JP)
MASUDA HIROSHI (JP)
Application Number:
PCT/JP2011/059158
Publication Date:
February 09, 2012
Filing Date:
April 13, 2011
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Assignee:
MURATA MANUFACTURING CO (JP)
TAMARU IKUO (JP)
YAZAKI HIROKAZU (JP)
MASUDA HIROSHI (JP)
International Classes:
H01P5/18
Foreign References:
JPS5861503U1983-04-25
JP2005203824A2005-07-28
JPH11220312A1999-08-10
US5424694A1995-06-13
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Claims: