公开(公告)号：CA2342063A1

公开(公告)日：2001-09-28

申请号：CA2342063

申请日：2001-03-27

Applicant: CIT ALCATEL

Inventor： BROAD GRAHAM ,  STEER LEWIS

IPC: H01P1/208 ,  H01P1/30 ,  H01P1/207

Abstract: This invention discloses an improved thermal compensation arrangement for a microwave filter of the type comprising at least one cavity defined by a metal side wall having a low coefficient of thermal expansion, such as invar, and lightweight metal end walls, such as aluminium, having good thermal and electrical conductivity, but a high coefficient of thermal expansion. The present invention comprises a characteristic arrangement of annular grooves and slots in the end walls that mechanically isolate the end walls from the side wall fixed thereto, to avoid distortion of the cavity with changes in temperature.

公开(公告)号：BR9916459A

公开(公告)日：2001-09-04

申请号：BR9916459

申请日：1999-12-06

Applicant: CIT ALCATEL

Inventor： BROAD GRAHAM ,  MCDONALD NOEL ,  WILLIAMS CHARLES

IPC: H01P1/213 ,  H01P1/208

Abstract: A waveguide directional filter for combining multiple high power UHF television broadcasting transmitters on to a common antenna. The directional filter arrangement includes an input waveguide, an output waveguide and an interconnected cascade assembly of two or more cavity resonators. The input and output waveguides are each aperture-coupled to an end cavity resonator of the cascade assembly. The edges of each aperture incorporate inwardly extending curved protrusions of a characteristic shape. Alternatively or additionally, at least one pair of non-adjacent cavity resonators are coupled by at least one additional coupling element incorporating an external transmission line.

公开(公告)号：AU7150500A

公开(公告)日：2001-03-15

申请号：AU7150500

申请日：2000-11-10

Applicant: CIT ALCATEL

Inventor： BROAD GRAHAM ,  BOWEY STEVEN

IPC: H01P1/208 ,  H01P1/213