MULTILAYER BALUN TRANSFORMER - MURATA MANUFACTURING CO

Title:

MULTILAYER BALUN TRANSFORMER

Document Type and Number:

WIPO Patent Application WO/2006/123485

Kind Code:

A1

Abstract:

A multilayer balun transformer whose balance characteristic is improved and whose parasitic inductance is prevented from occurring. The multilayer balun transformer outputs an unbalance signal as a balance signal by converting the impedance into 1:4. The transformer comprises a magnetic board (1), a multilayer body (2), a magnetic board (3), and external electrodes (4-1 to 4-6). The multilayer body (2) has first and second transformers (5, 6) and a nonmagnetic body (7) completely covering the first and second transformers (5,6) from outside. The first and second transformers (5, 6) are arranged side by side in such a way that the arrangement directions generally parallel to the magnetic board (1). The primary coil (5-1) of the first transformer (5) and the secondary coil (6-2) of the secondary transformer (6) are 180° rotationally symmetrical with respect to the center line L and the secondary coil (5-2) and the primary coil (6-1) are 180° rotationally symmetrical with respect to the center line L.

Inventors:

FUJIKI YASUHIRO (JP)
MATSUDA KATSUJI (JP)
ISHIDA KOSUKE (JP)

Application Number:

PCT/JP2006/307336

Publication Date:

November 23, 2006

Filing Date:

April 06, 2006

Export Citation:

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Assignee:

MURATA MANUFACTURING CO (JP)
FUJIKI YASUHIRO (JP)
MATSUDA KATSUJI (JP)
ISHIDA KOSUKE (JP)

International Classes:

H01F19/06; H01F17/00

Foreign References:

JP2002359507A	2002-12-13
JPH1154336A	1999-02-26
JPH09139315A	1997-05-27
JP2005509300A	2005-04-07

Other References: