MULTIMODE DIELECTRIC-LOADED MULTI-FLARE ANTENNA

摘要

A small aperture forward facing antenna (3) for receiving far-field electromagnetic signals comprising an outer conical shell and interiorly of which are formed at least first and second conically flared, conductive, stages (4, 10) of increasing flare angles ( theta 1, theta 2) which are rigidly or telescopically coupled to one another via an intermediate cylindrical stage (8). In one construction a dielectric coating (22) is applied to form a conically smooth interior surface over all stages. In other constructions, one or more of the conically flared (4, 10) and cylindrical stages (8) include conical dielectric inserts or coating, (23). Mountable at varying positions relative to the antenna input aperture are various forward facing focusing lenses (38) or homogeneous dielectric scatters (19) and to the output is a low noise wave guide converter (16). A remotely controlled, axial mount assembly enclosed in gas-filled, roof mountable radome (50) is also disclosed. Alternatively, the antenna may be used to transmit a directional electromagnetic wave.