the role of ordinary bessel and hankel functions in simulation of plasma valve mechanism in a loss-free metallic cylindrical waveguide

In this paper, a finite cylindrical plasma waveguide is investigated as a plasma valve in the path of a non-dissipative cylindrical waveguide with metal walls. theoretical simulation to investigate the effect of the main parameters of this plasma valve on the transmission coefficients and reflection coefficients of the symmetric modes is the main part of this paper. the transmittance coefficients of electromagnetic waves in each symmetric mode are introduced in terms of henkel functions and ordinary bessel functions, and the role of these functions in the purification of some modes is investigated. taking into account the boundary conditions, the transmission coefficient of the output wave modes from the plasma valve are obtained. the diagrams of the mentioned coefficient versus the incident wave frequency, geometry dimensions and the type of the used plasma in the valve are studied.