Abstract: A geodesic antenna includes an outer cone. The geodesic antenna also includes an inner cone positioned partially within the outer cone and, together with the outer cone, defining an electromagnetic waveguide. The geodesic antenna further includes multiple driven elements configured to generate electromagnetic waves in a space between the outer and inner cones. In addition, the geodesic antenna includes a ground plane configured to reflect first electromagnetic waves of the generated electromagnetic waves back into the space between the outer and inner cones. The ground plane has a geometric design that prevents at least some second electromagnetic waves of the generated electromagnetic waves from being reflected from the ground plane and forming an interferometer pattern.

Abstract: A geodesic antenna includes an outer cone. The geodesic antenna also includes an inner cone positioned partially within the outer cone and, together with the outer cone, defining an electromagnetic waveguide. The geodesic antenna further includes multiple driven elements configured to generate electromagnetic waves in a space between the outer and inner cones. In addition, the geodesic antenna includes a ground plane configured to reflect first electromagnetic waves of the generated electromagnetic waves back into the space between the outer and inner cones. The ground plane has a geometric design that prevents at least some second electromagnetic waves of the generated electromagnetic waves from being reflected from the ground plane and forming an interferometer pattern.

Abstract: An apparatus for mitigating element pattern ripple includes an inner cone, an outer cone, at least one driven element, and at least one director. The outer cone is coupled to the inner cone. The at least one driving element is coupled to the outer cone and is configured to produce at least one primary ray. The at least one director is coupled to the outer cone and is configured to direct the at least one primary ray. The inner cone and the outer cone may be concentric. The at least one driven element may include multiple driven elements. The at least one director may include multiple directors. A number of directors may be equal to a number of driven elements.