Patent ID: 6861997

Claim:
A parallel plate septum polarizer comprising: a) three generally parallel electrically conductive plates comprised of a first plate, a second plate and a third plate with spatial separation therebetween; b) a space between the first and second plates forming a waveguide A; c) a space between the second and third plates forming a waveguide B; d) the first and third plates extending beyond the second plate and with the space between the first and third plates beyond the second plate forming a waveguide C; e) a plurality of projections extending outwardly from the body of the second plate and which generally extend in angularly related directions into the waveguide C; f) the periphery of the projections on the second plate and the edge on the second plate front which the projections extend defining a boundary between waveguides A and C and a boundary between waveguides B and C; and g) the length of each projection, measured from the base of the projection where it extends from the edge of the second plate to a tip thereof, is on the order of or longer than the shortest wavelength in the media which fills the spaces between the plates.