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Patent Searching and Data


Title:
IMPEDANCE MATCHING CIRCUIT AND ANTENNA USING IMPEDANCE MATCHING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2001/045204
Kind Code:
A1
Abstract:
One matching circuit (8-2) comprises a transmission line (6b) of a predetermined electrical length and a parallel resonance circuit (5) connected in parallel with the transmission line. The resonance circuit has a resonant frequency f2 and a predetermined susceptance at a frequency f1 lower than the frequency f2. Another matching circuit (8-1) comprises a transmission line (6a) of a predetermined electrical length and a capacitor element (3a) connected in series with the transmission line between an input terminal (2) of an antenna (1) and the matching circuit (8-2) so that the input impedance of the antenna at the frequency f2 may match the characteristic impedance of an external circuit (10).

Inventors:
OHWADA TETSU (JP)
MIYAZAKI MORIYASU (JP)
NISHINO TAMOTSU (JP)
ENDO TSUTOMU (JP)
Application Number:
PCT/JP1999/007030
Publication Date:
June 21, 2001
Filing Date:
December 15, 1999
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
OHWADA TETSU (JP)
MIYAZAKI MORIYASU (JP)
NISHINO TAMOTSU (JP)
ENDO TSUTOMU (JP)
International Classes:
H01Q1/22; H01Q1/36; H01Q1/38; H01Q5/00; H01Q5/10; H01Q5/335; H01Q11/08; H01Q21/30; H01Q23/00; (IPC1-7): H01Q5/00; H01Q1/38
Foreign References:
JPH0514040A1993-01-22
EP0613209A11994-08-31
JPH05206888A1993-08-13
US5617105A1997-04-01
JPS62279704A1987-12-04
US5828348A1998-10-27
Attorney, Agent or Firm:
Tazawa, Hiroaki (Kasumigaseki 3-chome Chiyoda-ku Tokyo, Kasumigaseki 3-chome Chiyoda-ku Tokyo, JP)
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