Patent ID: 6011520
Filing Date: 2000-01-04
Classification: H01Q

Abstract:
An antenna, comprising:a parallel plate waveguide formed by a first cylindrical conductor and a second cylindrical conductor separated by a cylindrical gap, the first cylindrical conductor, the second cylindrical conductor, and the cylindrical gap being coaxial;a first base plate connected to a base end of the first cylindrical conductor, the first base plate being disc-shaped and having an outside diameter substantially equal to a diameter of the first cylindrical conductor, thereby partially enclosing the base end of the first cylindrical conductor;a second base plate connected to a base end of the second cylindrical conductor, the second base plate being disc-shaped and having an outside diameter substantially equal to a diameter of the second cylindrical conductor, thereby partially enclosing the base end of the second cylindrical conductor;a feed probe wall, being ring-shaped and coaxial with the first cylindrical conductor and connecting an inside diameter of the first base plate and an inside diameter of the second base plate;a plurality of feed probes protruding through the first base plate and into the cylindrical gap, the feed probes being spaced apart at equal distances around the circumference of a feed probe circle, the feed probe circle being coaxial with the first cylindrical conductor and having a diameter greater than a diameter of the feed probe wall;the second cylindrical conductor being positioned substantially within the first cylindrical conductor;the first cylindrical conductor having at least one circumferential slot extending along the circumference of the first cylindrical conductor; andeach circumferential slot operative to radiate electromagnetic energy, when the feed probes are excited, thereby producing a radiation pattern.