PATTERN OF A LINEAR ANTENNA ERECTED OVER A TAPERED GROUND SCREEN

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Abstract
A theory is presented for the radiation from a thin vertical antenna located above and at the center of a sector ground system. The formulation is carried out for a general variation of the surface impedance of the system. To facilitate discussion, certain limiting cases are considered in some detail. Of special interest is the possibility that the low-angle radiation pattern of an h.f. antenna over a dielectric-type ground will be vastly improved by using a ground screen whose surface impedance varies exponentially, in the radial direction, from the base of the antenna.

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