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Title:
DUAL RESONANCE ANTENNA APPARATUS
Document Type and Number:
WIPO Patent Application WO/2003/055087
Kind Code:
A1
Abstract:
A dual resonance antenna apparatus includes an antenna element (22) and an LC parallel resonance circuit (31) for resonating the antenna element (22) in a plurality of frequency bands. The LC parallel resonance circuit (31) has a T-shaped circuit or a &pgr -shaped circuit consisting of an inductance element (26) which is a shunt element for preventing the impedance from becoming infinitely great in a predetermined frequency band and capacitance elements (29, 30). This can eliminate a drop-in point in the frequency characteristic, i.e., notch causing deterioration of a gain.

Inventors:
Dakeya, Yujiro c/o Intellectual Property Group (Murata Manufacturing Co. Ltd. 26-1, Tenjin 2-chome Nagaokakyo-shi Kyoto, 617-8555, JP)
Matsutaka, Shinji c/o Intellectual Property Group (Murata Manufacturing Co. Ltd. 26-1, Tenjin 2-chome Nagaokakyo-shi Kyoto, 617-8555, JP)
Application Number:
PCT/JP2002/013260
Publication Date:
July 03, 2003
Filing Date:
December 19, 2002
Export Citation:
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Assignee:
Murata Manufacturing, Ltd CO. (26-10, Tenjin 2-chome Nagaokakyo-shi, Kyoto, 617-8555, JP)
Dakeya, Yujiro c/o Intellectual Property Group (Murata Manufacturing Co. Ltd. 26-1, Tenjin 2-chome Nagaokakyo-shi Kyoto, 617-8555, JP)
Matsutaka, Shinji c/o Intellectual Property Group (Murata Manufacturing Co. Ltd. 26-1, Tenjin 2-chome Nagaokakyo-shi Kyoto, 617-8555, JP)
International Classes:
H01P1/20; H01Q5/10; H01Q5/307; H01Q5/335; H01Q9/30; H01Q21/30; H04B1/04; H04B1/18; (IPC1-7): H04B1/18; H01Q5/01
Foreign References:
JP2001036328A2001-02-09
JPH01151829A1989-06-14
JP2001185949A2001-07-06
EP0126340A21984-11-28
Other References:
See also references of EP 1458108A4
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