V. V. Vereitin – Post-graduate Student,

Voronezh State Technical University

E-mail: 1nza1@bk.ru

A. I. Klimov – Dr.Sc. (Eng.), Associate Professor,

Professor of Department of Infocommunication Systems and Technologies,

Voronezh Institute of the Ministry of the Interior of Russia

E-mail: alexserkos@inbox.ru

Yu. B. Nechaev – Honored Scientist of RF, Dr.Sc. (Phys.-Math.), Professor,

Professor of Information Systems Department,

Voronezh State University

E-mail: nechaev_ub@mail.ru

I. V. Peshkov – Ph.D. (Phys.-Math.), Associate Professor, Associate Professor of Department of Physics, Radio Engineering and Electronics, Bunin Yelets State University E-mail: ilvpeshkov@gmail.com

Antenna-feeder devices of modern base stations and repeaters of digital mobile radio communication systems of the standards APCO25, DMR, TETRA et al. in the UHF range are constructed on the base of elementary antennas with a circular directional pattern in the horizontal plane in the form of non-symmetrical and symmetrical electric vibrators, and sector antennas (SA) and antenna arrays (AA), from which, in turn, annular (AAA) and cylindrical (CAA) antenna arrays are built. Using of AAAs and CAAs with electric control of the shape and position of the directional pattern ensures the formation of the required radio coverage zones with the possibility of their operative reconfiguration.

In this work, as a CAA element for mobile radio system equipment, we used a two-element linear array with a sector directional pattern, designed for operation in the frequency band 400–470 MHz with a minimum gain of 9–10 dB and SWR no more than 2 when powered by a coaxial feeder with a wave resistance of 50 Ohms. The array is composed of two compact broadband antenna elements in the form of a pair of earthed emitters and a reflector. The elements are spaced in the vertical direction at a distance of no more than 0,8 of the minimum working wavelength, so that the CAA height is not more than 110 cm. The array elements can work both separately and together using a typical power divider/combiner and typical electronic switches.

The results of computer simulations of a new version of the CAA 4×2 with a radius of 18,7 cm consisting of elements with an extended operating frequency band, are derived using the HFSS program.

The obtained results allow us to conclude that the CAA described above is characterized by small dimensions, sufficiently high electrical characteristics and can be considered as quite promising for use in the equipment of base stations and repeaters of UHF mobile radio communication systems.

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