Title:
RING FILTER AND BROAD-BANDPASS FILTER USING SAME
Document Type and Number:
WIPO Patent Application WO/2004/105175
Kind Code:
A1
Abstract:
A bandpass filter for high frequency having a broad band, a small insertion loss, a flat passband, and a sharp attenuation. To a microstrip line ring resonator having an electric length of the line of one wavelength, an input terminal for a high frequency signal disposed at a given point of the line, an output terminal disposed at a distance of an electrical length of 1/4 wavelength from the input terminal, and an open stab having an electrical length of 1/4 wavelength (or a short-circuited stab having an electrical length of 1/2 wavelength) disposed at a position spaced from the input terminal by 1/4 wavelength are provided, thereby fabricating a ring filter. Such ring filters having different attenuation polar frequencies are cascaded.
Inventors:
ARAKI KIYOMICHI (JP)
ISHIDA HITOSHI (JP)
NAKAGAWA TAKAO (JP)
ISHIDA HITOSHI (JP)
NAKAGAWA TAKAO (JP)
Application Number:
PCT/JP2004/001963
Publication Date:
December 02, 2004
Filing Date:
February 20, 2004
Export Citation:
Assignee:
CIRCLE PROMOTION SCIENCE & ENG (JP)
ARAKI KIYOMICHI (JP)
ISHIDA HITOSHI (JP)
NAKAGAWA TAKAO (JP)
ARAKI KIYOMICHI (JP)
ISHIDA HITOSHI (JP)
NAKAGAWA TAKAO (JP)
International Classes:
H01P1/203; H01P7/08; (IPC1-7): H01P7/08
Foreign References:
| JP2000209002A | 2000-07-28 | |||
| JP2001102806A | 2001-04-13 | |||
| JPH09139612A | 1997-05-27 | |||
| JP2002158503A | 2002-05-31 | |||
| JPH05315805A | 1993-11-26 | |||
| JP2002026606A | 2002-01-25 | |||
| JPS62224948A | 1987-10-02 | |||
| JPS5899002A | 1983-06-13 | |||
| JP2800323B2 | 1998-09-21 | |||
| JP2000252706A | 2000-09-14 | |||
| JPS62160801A | 1987-07-16 |
Attorney, Agent or Firm:
Agata, Yuzo (Akasaka 2-chome Minato-ku, Tokyo, JP)
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