Equivalent Surface Impedance of an Infinite Periodic Array of Slot Impedance Loads Based on an Equilateral Triangle Cros
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TRODYNAMICS AND WAVE PROPAGATION
Equivalent Surface Impedance of an Infinite Periodic Array of Slot Impedance Loads Based on an Equilateral Triangle Cross-Section Cavity with a Dielectric Coating V. G. Koshkid’koa,* and E. S. Serdyuka aInstitute
of Radio Engineering Systems and Control, Southern Federal University, Taganrog, 347922 Russia *e-mail: [email protected] Received December 22, 2019; revised December 22, 2019; accepted January 18, 2020
Abstract—In this paper, we consider a two-dimensional problem of determining the equivalent surface impedance of an infinite array of slot impedance loads with a dielectric layer. Each element of the array contains three regions: the first region occupies the entire half-space above the interface and the primary field is excited in this region by a plane wave; the second region does not contain excitation sources and is a dielectric layer; and the third region also does not contain exciting sources and is bounded by the walls of the cavity with a equilateral triangle cross section. The second and third regions are connected through one or several slots in a perfectly conducting screen located at their border. A strip conductor is located in the opening of each slot. The problem was solved by the method of integral equations, for the numerical implementation of which the Krylov–Bogolyubov method was used. Numerical results are presented as the dependences of the equivalent surface impedance on the geometric dimensions of the structure at fixed values of the array period, the incidence angle of the electromagnetic wave, and the thickness of the dielectric layer. A comparative analysis of the obtained dependences with the characteristics of a similar array without a dielectric layer is performed. DOI: 10.1134/S1064226920110091
INTRODUCTION The problem of implementing reactive surface impedance is relevant when solving problems of controlling the scattered fields of conducting bodies in radiolocation [1–8], in antenna technology when developing surface wave antennas, and in problems of providing antenna decoupling [9–11], as well as in the development of so-called “textured electromagnetic surfaces” and “artificial impedance surfaces” [12, 13]. In most cases, either single rectangular grooves or ribbed structures based on them are usually used as a structure that implements reactive surface impedance. Besides, slot impedance loads (SILs) built based on a hole in a perfectly conducting screen loaded with a cavity were used for this purpose. The characteristics of various SIL designs that allow implementing reactive surface impedance both in a single version [14–28] and as a part of infinite arrays [29–43] were studied in [14–43]. The problem of excitation of a plane wave by a single SIL based on a cavity with an equilateral triangle cross section was solved in [14], and the results for this construction as a part of an infinite array were presented in [37, 43]. To protect similar structures from the external environment, dielectric coatings and fairings, are
used. Therefore, the e
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