Gain of a surface wave horn antenna

An analytical and experimental investigation of the radiation properties of the
H
-plane sectoral surface wave horn, excited in the
TE_{10}
mode, is described in this paper. The surface wave horn antenna utilizing an unsymmetrical radial surface wave is described. The antenna consists of an inductively reactive horizontal surface coincident with the
y = 0
plane of a cylindrical coordinate system (
y, \phi,\rho
). This surface is confined between two conducting walls located at
\phi = \pm\alpha
(where
\alpha
is the flare angle of the horn). Given the flare length, variation of the on-axis gain of the horn is analytically investigated, and design procedure for determining optimum
\alpha
, in order to obtain maximum on-axis gain, is indicated.