Title:
FREQUENCY-STABILIZING CIRCUIT, ANTENNA APPARATUS AND COMMUNICATION TERMINAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/020576
Kind Code:
A1
Abstract:
A frequency-stabilizing circuit (25) comprises four coiled conductors (L1 to L4). The first coiled conductor (L1) and the second coiled conductor (L2) are connected in series to constitute a first series circuit. The third coiled conductor (L3) and the fourth coiled conductor (L4) are connected in series to constitute a second series circuit. The first series circuit is connected between an antenna port and a feeding port, and the second series circuit is connected to between the antenna port and a ground. The first coiled conductor (L1) and the second coiled conductor (L2) are wound to constitute a first closed magnetic path (loop shown by a magnetic flux (FP12)), and the third coiled conductor (L3) and the fourth coiled conductor (L4) are wound to constitute a second closed magnetic path (loop shown by a magnetic flux FP34).
Inventors:
ISHIZUKA KENICHI (JP)
KATO NOBORU (JP)
KATO NOBORU (JP)
Application Number:
PCT/JP2011/050883
Publication Date:
February 16, 2012
Filing Date:
January 19, 2011
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
ISHIZUKA KENICHI (JP)
KATO NOBORU (JP)
ISHIZUKA KENICHI (JP)
KATO NOBORU (JP)
International Classes:
H04B1/40; H01F17/00; H01P5/08; H01P5/10; H01Q1/24; H01Q1/50; H03H7/38; H04B1/04
Foreign References:
| JP2000244273A | 2000-09-08 | |||
| JP2004304615A | 2004-10-28 | |||
| JP2009246624A | 2009-10-22 | |||
| JP2005323132A | 2005-11-17 | |||
| JP2004172919A | 2004-06-17 | |||
| JP2005006096A | 2005-01-06 | |||
| JP2008118359A | 2008-05-22 |
Other References:
See also references of EP 2453581A4
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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Claims: