US 7,321,277 B2
Waveguide directional filter
Graham J. Broad, Lilydale (Australia); Noel A. McDonald, Croydon (Australia); and Charles Williams, Ferntree Gully (Australia)
Assigned to Alcatel, Paris (France)
Filed on Jun. 16, 2005, as Appl. No. 11/153,405.
Application 11/153405 is a continuation of application No. 10/803898, filed on Mar. 19, 2004, granted, now 6,917,260.
Application 10/803898 is a continuation of application No. 09/857104, granted, now 6,714,096, previously published as PCT/AU99/01071, filed on Dec. 06, 1999.
Claims priority of application No. PP7470 (AU), filed on Dec. 04, 1998.
Prior Publication US 2005/0231301 A1, Oct. 20, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. H01P 5/00 (2006.01)
U.S. Cl. 333—110  [333/135; 333/21 R] 19 Claims
OG exemplary drawing
 
1. A waveguide directional filter arrangement comprising an input waveguide, an output waveguide and a resonator structure comprising at least one cavity resonator, wherein each said waveguide is coupled via a respective aperture to said resonator structure, wherein each aperture includes a plurality of inwardly extending curved protrusions of approximately hemicycle shape, each protrusion comprising a curved segment having and edge with a continuous radius of curvature along which there are two intermediate points at each of which a tangent to said edge is parallel to a tangent to an edge of a different one of said protrusions.