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Abstract
This is the first of a series of papers concerned with improving the radiation characteristics of conical horn antennas by means of dielectric loading, edge modification, edge diffraction compensation, wall corrugation and impedance loading schemes. A conical dielectric shell attached to the inner wall of the horn is examined in this paper and found to improve the axial directivity and half power beamwidth of the antenna at the expense of minor deterioration in the side lobes. An exact formulation of the boundary value problem is presented leading to analytical results which are in good agreement with experiment.