Journal of Radio Electronics. eISSN 1684-1719. 2025. №12

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DOI: https://doi.org/10.30898/1684-1719.2025.12.10

 

 

 

Thin Aluminum Films
as Microwave Reflector Mirrors

 

М.А. Tarasov1, D.S. Zhogov1, А.M. Chekushkin1, R.К. Кozulin1,
А.S. Marukhno2, А.А. Тatarintsev3, А.А. Lomov3

 

1V.A. Kotelnikov Institute of Radio Engineering and Electronics of RAS,
125009, Russia, Moscow, Mokhovaya str., 11, bldg. 7

2Special Astrophysical Observatory of RAS,
369167, Russia, Karachaevo-Cherkesiya, p. Nizhnii Arkhyz

3National Research Center "Kurchatov Institute", Valiev institute of physics and technology of RAS,
117218, Russia, Moscow, Nakhimovsky Prospect 36, bldg. 1.

 

The paper was received December 8, 2025.

 

Abstract. Thin-film mirrors are used to fabricate quasi-optical high-Q resonators and mirrors for optical and radio telescopes. Film quality and their reflective properties can significantly impact the performance of these devices. A series of X-ray structural, electron microscopic, and atomic force studies were conducted, along with reflection coefficient measurements at frequencies of 30-300 GHz. For films 100, 200, and 300 nm thick, grown by magnetron and thermal deposition, the power reflection coefficients were measured for the film pressed against the open end of the output waveguide of a directional coupler. At frequencies above 90 GHz, the power reflection coefficient exceeded 0.97 within a measurement accuracy of 0.03. Based on these results, we can conclude that the reflective properties of the BTA mirror allow operation at frequencies above 90 GHz without taking into account reflection losses at the mirrors.

Key words: thin metal films, Al, thermal evaporation, magnetron sputtering, reflectivity, losses, thermal noise.

Financing: supported by RSCF under grant 23-79-00022

Corresponding author: Tarasov Mikhail Aleksandrovich, tarasov@hitech.cplire.ru

 

References

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For citation:

Tarasov M.A., Zhogov D.S., Chekushkin A.M., Kozulin R.K., Marukhno A.S., Tatarintsev A.A., Lomov A.A. Thin aluminum films as microwave reflector mirrors. // Journal of Radio Electronics. – 2025. – №. 12. https://doi.org/10.30898/1684-1719.2025.12.10 (In Russian)