Admittance of an Inhomogeneously Sheathed Infinite Cylindrical Antenna Immersed in an Isotropic, Compressible Plasma

The admittance of an infinite cylindrical antenna excited at a circumferential gap of nonzero thickness and immersed in a lossy, isotropic compressible plasma medium is obtained from numerical calculations, taking into account the inhomogeneous ion sheath which forms about a body at floating potential in a warm plasma. The admittance for the inhomogeneous sheath is found to be fairly similar to that for the sheathless case, with the exception of a rather sharp maximum or resonance in the admittance just below the plasma frequency which results from the sheath inhomogeneity.