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Title:
ANTENNA STRUCTURE AND COMMUNICATION DEVICE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2005/055364
Kind Code:
A1
Abstract:
An antenna structure (1) has a power-fed radiation electrode (2) and a non-power-fed radiation electrode (3) which are magnetically coupled. By forming a main slit (4), the power-fed radiation electrode (2) is formed to have a U-shaped portion (T) in the middle of the route from a feeder end (Q) toward an open end (K) while bypassing the main slit (4). The power-fed radiation electrode (2) has an auxiliary slit (10) arranged for forming an open stub (12) connected to the U-shaped portion (T) for adding an electrostatic capacity to the U-shaped portion (T). By changing the electrostatic capacity given to the U-shaped portion (T) of the power-fed radiation electrode (2) by the open stub (12), it is possible to change/control high-degree resonance frequency (F2) of the power-fed radiation electrode (2) while suppressing fluctuations of the resonance state of the basic resonance frequency band of the power-fed radiation electrode (2) (such as the basic resonance frequency F1 and Q value), the magnetic coupling state between the power-fed radiation electrode (2) and the non-power-fed radiation electrode (3), and the impedance matching state.

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Inventors:
KAWAHATA KAZUNARI (JP)
KURITA JUNICHI (JP)
Application Number:
PCT/JP2004/017788
Publication Date:
June 16, 2005
Filing Date:
November 30, 2004
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
KAWAHATA KAZUNARI (JP)
KURITA JUNICHI (JP)
International Classes:
H01Q1/24; H01Q5/10; H01Q5/342; H01Q5/378; H01Q5/385; H01Q9/04; H01Q13/08; H01Q19/00; H01Q21/30; (IPC1-7): H01Q13/08; H01Q5/01; H01Q9/42
Domestic Patent References:
WO2002075853A12002-09-26
WO2003007429A12003-01-23
WO2001018909A12001-03-15
WO1999003168A11999-01-21
Foreign References:
JP2001217643A2001-08-10
JP2003008326A2003-01-10
JPH02812U1990-01-05
Attorney, Agent or Firm:
Igarashi, Kiyoshi (Yokohamahigashiguchi Bldg. 10-13, Takashima 2-chome, Nishi-ku, Yokohama-sh, Kanagawa 11, JP)
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