We present the experimental results of measuring the reflection coefficient of a microwave output window made of radiation-modified fluoroplast (Raflon™) with antireflection coating made by using surface machining. The quarter-wave antireflection coating was created by drilling shallow holes in a high-density hexagonal pattern over the plate surface. The Maxwell Garnett formula was used to estimate the value of the effective dielectric permittivity of the periodic structure, since this formula is the most suitable for approximation of effective properties of cylindrically shaped inhomogeneities. The dielectric permittivity of such a structure in the transverse direction corresponds to the value optimal for increasing the window transparency in the specified frequency range. It is found experimentally that the reflection coefficient in the band 120–140 GHz does not exceed −20 dB. The obtained results are compared with the theoretical calculation and numerical analysis in the CST Studio Suite.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 65, No. 1, pp. 27–34, January 2022. Russian DOI: https://doi.org/10.52452/00213462_2022_65_01_27
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Ryabov, A.V., Sobolev, D.I. Antireflection Coating of a Dielectric Plate in the Microwave Band Using Surface Machining. Radiophys Quantum El 65, 25–31 (2022). https://doi.org/10.1007/s11141-022-10194-z
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DOI: https://doi.org/10.1007/s11141-022-10194-z