Effect of real material characteristics on properties of linear initiators of MW discharges on a metallized dielectric surface of airfoil model

Abstract

The results of numerical simulation and experimental tests of different method of creation of periodic regular systems of MW discharges on a dielectric surface in the field of quasioptical beam of external lowpower microwave (MW) radiation source with various-type linear electromagnetic (EM) vibrators are presented in the paper. It is demonstrated that such characteristics of real materials as dielectric permittivity, loss tangent, conductivity, etc., essentially effect on properties and, hence, final design of plasma initiators. Thus, results of 3D simulation have indicated that if a dielectric material with loss tangent tgδ > 10 -2 is placed between an initiator and metallic screen-reflector maximum coefficient of amplification shifts on some small distance from the metallic screen towards the MW radiation source; MW losses in real dielectrics play significant role and effect on resonant properties of linear EM vibrators and, thereby, work of initiators of MW discharges. Solution of the problem of excitation of a multi-mode structure of electromagnetic waves in the multi-vibrators system is also discussed.