TECHNIQUE OF JUSTIFICATION OF ELECTRODYNAMIC AND CONSTRUCTIVE PARAMETERS OF CONSTRUCTIVE ABSORBING MATERIALS OF WAVEGUIDE TYPE
The paper proposes a method for substantiating the electrodynamic and structural parameters of waveguide-type materials, based on the developed model for the absorption of microwave radiation on impedance walls and the dielectric filler of structural absorbing materials of closed waveguide structures. The essence of the model, based on the methods of the theory of diffraction of electromagnetic waves in layered media, the laws of propagation of microwave radiation in waveguides, is that the electromagnetic field in front of the grating is considered as a superposition of the fields of the incident plane wave, mirrored from the “medium-material” interface, and scattered on the walls of the lattice material. An electromagnetic wave incident on the material, as it propagates deep into it, interacts with radio-absorbing walls. An approach is proposed for determining the reflection coefficient of a material, a feature of which is that a term is introduced in the expression for calculating the reflection coefficient describing an exponential decrease in the amplitude level (power flux density) of the diffuse component of the electromagnetic field when it propagates deep into the material and back impedance walls and dielectric filler of closed waveguide structures (short-circuited waveguide segments), and allowing becoming patterns between reflection characteristics of the structural material and the absorbent electrodynamic and design parameters.
Keywords: attenuation of microwave radiation, structural absorbing material, reflection coefficient, absorption coefficient, power flux density of an electromagnetic field