The input impedance of a probe-fed rectangular cavity which transmits through a plasma-covered cylindrical body

A method-of-moments solution for the input impedance of a probe-fed cavity which radiates through a plasma-covered cylindrical body is presented. A general description of the method-of-moments solution and cyclindrical aperture analysis is given. Mathematical expressions are given for the cylindrical aperture admittances. Numerical examples of the input impedance which correspond to cylinders of several different radii have been generated when free space is assumed to cover the antenna aperture and when an inhomogeneous plasma is assumed to cover the antenna aperture. The analysis shows that, for the specific free-space and plasma examples, the input impedance differed little from that of a ground plane antenna, even when the radius of the cylinder was relatively small.<>