The description of mode matching method, in electromagnetic wave transmission from a loss free semi-bounded waveguide to the plasma waveguide

Abstract

Using the mode matching technique, the passing phenomenon of electromagnetic waves from a semi-bounded cylindrical dielectric waveguide to a semi-bounded plasma waveguide have been studied. A thin dielectric layer is placed around the plasma waveguide. An electromagnetic wave in a single mode will be injected into the plasma waveguide from the filled dielectric waveguide. The interaction of the incident wave with interface surface, between two semi-bounded waveguides, will produce new modes for the transmitted waves. It will be shown that the transmission coefficients of the transmitted waves depend on several parameters such as the incident wave frequency, characteristic mode number of incident wave, the thickness of the dielectric layer around the plasma and the plasma electron frequency. To obtaining the transmission coefficients, an approximation solution is introduced and the diagrams of the transmission coefficients versus the incident wave frequency for some different geometric dimensions of the waveguides are investigated.