| 摘要 |
<p>A dielectric inset (26) mountable within a conical horn antenna (1) for focusing an impinging electromagnetic wavefront as a planar wavefront at an attached waveguide (12). In one construction a homogeneous inset (29) having an ellipsoidal forward surface (32) and conical aft surface is fitted into a double flared conical antenna body (1) including a cylindrical, hybrid mode matching section (8). In various alternative compound constructions, materials of differing dielectric constants and geometrical shapes are arranged to facilitate a site and weight reduction of the inset (29) and focus the incident wavefront relative to the waveguide (12). In other embodiments, still lower density materials, including suspended metallic particulates are used.</p> |
