Radiation from an electric dipole surrounded by a plasma cylinder with a cavity

We solve the problem ofthe influence ofa small-radius (ka ≪ 1) isotropic plasma cylinder with a coaxial free-space cavity on the radiation from a source of electromagnetic waves to an outer region offree space. Conditions ofthe resonance radiation are obtained and characteristics ofthis radiation as functions ofthe relative size ofthe cavity are studied. We show that the resonance frequency splits into two frequencies such that the transmission coefficients at these frequencies can exceed the resonance transmission coefficient for the plasma cylinder without a cavity. The results obtained are compared with the case ofemission from a two-layer spherical plasma resonator. © 2002 Plenum Publishing Corporation.