Title:
WAVEGUIDE GROUP BRANCHING FILTER
Document Type and Number:
WIPO Patent Application WO/2001/095423
Kind Code:
A1
Abstract:
A waveguide group branching filter, having a constitutional circuit comprising a circular-square waveguide multistage transformer 1, a branch waveguide polarization branching filter (4), a square waveguide multistage transformer (9), a square waveguide H plane T branch circuit (10), and waveguide band pass filters (8, 14, 18) and formed by digging two metal blocks from the surfaces. Radio waves V1, H1 having planes of polarization, respectively, vertical to and horizontal with the branch plane of the branch waveguide polarization branching filter (4) in some frequency band f1 and a radio wave V2 having the same plane of polarization as the radio wave V1 in frequency band f2 higher than frequency band f1 enter an input end P1. The radio waves V1, H1 and V2 are outputted, from output ends P2, P3 and P4, respectively.
Inventors:
YONEDA NAOFUMI (JP)
MIYAZAKI MORIYASU (JP)
YAMAGATA KOUSAKU (JP)
MIYAZAKI MORIYASU (JP)
YAMAGATA KOUSAKU (JP)
Application Number:
PCT/JP2001/002071
Publication Date:
December 13, 2001
Filing Date:
March 15, 2001
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
YONEDA NAOFUMI (JP)
MIYAZAKI MORIYASU (JP)
YAMAGATA KOUSAKU (JP)
YONEDA NAOFUMI (JP)
MIYAZAKI MORIYASU (JP)
YAMAGATA KOUSAKU (JP)
International Classes:
H01P1/161; H01P1/17; H01P1/207; H01P1/208; H01P1/211; H01P1/213; (IPC1-7): H01P1/16; H01P1/213
Foreign References:
| JPH1028003A | 1998-01-27 | |||
| JPH0927702A | 1997-01-28 | |||
| JPH0758519A | 1995-03-03 | |||
| JPH05102702A | 1993-04-23 | |||
| JPS63269601A | 1988-11-07 | |||
| JPS63166301A | 1988-07-09 |
Other References:
See also references of EP 1291955A4
Attorney, Agent or Firm:
Tazawa, Hiroaki (Kasumigaseki 3-chome Chiyoda-ku, Tokyo, JP)
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