1
Fred E Ashbaugh, Ordean S Anderson, Donald E Anderson, Ramakrishna A Nair, Michael J Riebel: Electromagnetic antenna collimator. Innova, Douglas L Tschida, November 24, 1992: US05166698 (127 worldwide citation)

A dielectric inset mountable within a conical horn antenna for focusing an impinging electromagnetic wave front as a planar wave front at an attached wave guide. In one construction a homogeneous inset having an ellipsoidal forward surface and conical aft surface is fitted into a double flared conic ...


2
Ordean S Anderson, Donald E Anderson, Ramakrishna A Nair, Michael J Riebel: Multimode dielectric-loaded double-flare antenna. Microbeam Corporation, D L Tschida, May 26, 1992: US05117240 (34 worldwide citation)

A small aperture horn antenna comprising an outer conical shell and interiorly of which are formed at least first and second conically flared, dielectric-coated stages of differing flare angles which are coupled to one another via an intermediate cylindrical stage. The dielectric coating is applied ...