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Journal Radioengineering №7 for 2016 г.
Article in number:
Doublesided microwave absorbing metasurfaces
Authors:
I.N. Kabanov - Ph. D. (Eng.), Head of Department, Mytishchinsky SRI of Radio-Measuring Instruments. E-mail: mr.kin63@mail.ru
V.V. Komarov - Dr. Sc. (Eng.), Professor, Department «Electronics and telecommunications», Saratov State University named after N.G. Chernyshevsky. E-mail: vyacheslav.komarov@gmail.com
V.P. Meschanov - Dr. Sc. (Eng.), Director of NIKA-Microwave, Ltd (Saratov). E-mail: nika373@bk.ru
Abstract:
Diverse artificial composite materials including nanomaterials are used nowadays for absorbing electromagnetic waves in different microwaves and terahertz systems. Bidimensional periodic structures, known as frequency selective surfaces (FSS) or metasurfaces (MS), can be also successfully adapted for these purposes. Almost all absorbing FSS are fabricated in the form of thin resistive elements (RE) periodically arranged on one side of dielectric substrate.
As it has been shown earlier microwave frequency-selective absorbers with multilayer or cascaded design demonstrate better electro-dynamic characteristics than single-layered one. In particular, it concerns the FSS with cross shaped RE developed for a microwave range.
Alternative approach to FSS design is considered in this paper. It is proposed to make so-called double-sided MS absorbers with con-ducting (or resistive) cross shaped elements on both sides of dielectric layer. Given approach has been verified numerically by employing 3D finite-difference time domain model preliminary tested on an example of terahertz absorber taken in the literature. Numerical simulations were carried out over the frequency range 120-200 GHz for MS with infinite conducting periodic elements on Teflon substrate. Absorption coefficient was found as A = 1 − |S11|2 − |S21|2, where |S11| and |S21| are the reflection and transmission coefficients respectively.
We have obtained two numerical solutions which satisfy a condition: |S11| → min, |S21| → min. First of them corresponds to FSS with sizes: a = 1.63 mm, b = 0.5 mm, w = 1.88 mm, d = 0.2 mm, where a and b are the sizes of cross shaped patch; d is the thickness of teflon substrate; w is the array period. Second solution has been obtained for FSS with a = 1.75 mm, b = 0.6 mm, w = 2 mm and the same d. Such MSs exhibit maximum absorption A = 0.83 at 167 GHz (first solution) and A = 0.816 at 146 GHz (second solution).
So it has been shown a principle possibility of developing thin double-sided FSS absorbers of millimeter wave range. Our further in-vestigations will be directed on optimization and synthesis of MSs with improved electromagnetic properties.
Pages: 17-20
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