Radiation from a tapered surface wave antenna

Utilizing results obtained previously for the propagation of electromagnetic waves along a plane surface having a linear spatial variation of surface admittance, an approximate analysis of the radiation properties of a certain two-dimensional tapered surface wave antenna is carried out. The radiating structure consists of a surface waveguide of finite length having a linear susceptance variation, inserted between a feeding surface waveguide with constant susceptance, and a perfectly conducting plane. The separate junction effects at the input and output ends of the taper are evaluated approximately for the case where the taper susceptance variation is gradual, and their combined influence on the radiation pattern is discussed.