RADIO PHYSICS AND RADIO ASTRONOMY

PACS number: 41.20.–q

Purpose: studies of electrodynamics properties of Fabry–Perot resonator formed by two parallel perfectly conducting screens of finite thickness with rectangular holes while its exciting by a plane wave.

Design: operator method of diffraction problems solving based on the method of partial areas and the method of generalized scattering matrixes.

Findings: The numerical modeling showed that module of the coefficient of plane wave reflection from the resonator is equal to zero at a fixed wavelength being prohibitive for segments of rectangular waveguides made in both screens. Here, a strong localization of electromagnetic field in the resonator volume is observed. Studying the frequencyselective properties of each screen individually it has been determined that there are no resonances of electromagnetic wave total transmission below the cut-off frequency of rectangular waveguides. It is found that with replacing one of the Fabry–Perot resonator mirrors by a solid metal plane, the amplitude of a plane wave in the resonator can increase by almost an order of magnitude as against the exciting field amplitude.

Conclusions: Unique electrodynamic properties of the considered structure can find application in devices for amplifying or generating electromagnetic waves in millimeter and submillimeter bands, as well as in measuring electrical properties of composite materials with large losses.

Key words: two-dimensional periodic screen, rectangular waveguide, Fabry–Perot resonator, reflection coefficient, ultraboundary waveguide

Manuscript submitted 11.11.2015

Radio phys. radio astron. 2016, 21(1): 58-64

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