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 c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Matsuta, Katsuji c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Ishida, Kosuke c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Matsuta, Katsuji c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Ishida, Kosuke c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Application Number:
PCT/JP2006/307336
Publication Date:
November 23, 2006
Filing Date:
April 06, 2006
Export Citation:
Assignee:
MURATA MANUFACTURING CO., LTD. (10-1, Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, 61785, JP)
Fujiki, Yasuhiro c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Matsuta, Katsuji c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Ishida, Kosuke c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Fujiki, Yasuhiro c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Matsuta, Katsuji c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
Ishida, Kosuke c/o MURATA MANUFACTURING CO. LTD. (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, 61785, JP)
International Classes:
H01F19/06; H01F17/00
Attorney, Agent or Firm:
Tsukahara, Takakazu (Long Well Kawasaki 202, 22-3 Minami-cho Kawasaki-k, Kawasaki-shi Kanagawa 15, 21000, JP)
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