A. Yu. Grinev - Dr.Sc. (Eng.), Professor, Moscow Aviation Institute (National Research University). E-mail: grinevau@yandex.ru
A. P. Kurochkin - Dr.Sc. (Eng.), Professor, Head of Department, JSC «Radio Engineering Corporation «VEGA»
A. P. Volkov - Postgraduate student, Moscow Aviation Institute (National Research University). E-mail: tkoh@yandex.ru

A wide range of practical challenges demand the use of low-profile complex bipolar antenna systems, having a high isolation feature in terms of polarization and a low mutual couple of two adjacent antenna systems. This configuration can be built with the use of a structure that possesses properties of high impedance surface, more specifically, an artificial magnetic conductor and an electromagnetic bandgap. Such structures are used when it is required to suppress surface waves, reduce transverse dimensions and decrease mutual couple of elements within antenna systems. During the first phase, the engineering solution for a low-profile antenna system was reasoned and a transformation of a basic periodic structure of high impedance was represented. Evaluations were carried out for the reflectance factor phase, a dispersion diagram, resonance frequency and a bandwidth of high impedance surface, using analytical approximation and the results of computational modeling by means of finite element method and Eigen mode method. During the second phase, an engineering solution was introduced for a low-profile antenna system based on an artificial material of high impedance, which allows placement of antenna elements at a very short distance above the ground plane, provided a sufficient bandwidth and a required isolation of the antenna. The newly-designed antenna system demonstrates low SWR values (not higher than 1,6) and low active antenna mutual couple values (not above -21 dB) in the bandwidth (435±30 MHz) at the height of 30 mm (0,043λ0), when a conventional solution implies the height of 172 mm (0,25λ0) in the dipole above ground plane configuration.