MULTIFUNCTIONAL ANTENNA DEVICE FOR PROTECTION OF RADIO COMMUNICATION CHANNELS OF UNITS OF LAW ENFORCEMENT FORCES

Abstract

Safe conduct of mass events requires from law enforcement forces to protect the units’ radio communication channels, detection and suppression of counterparty control radio channel. It also requires finding and destroying single-use interference transmitters, the presence of which is a manifestation of the aggressive intentions of the crowd. This requires means using antennas with directional properties, frequency ranges of which are determined by the established standard and mass radio communications. In general, the antenna parameters of radio systems, radio intelligence, radio monitoring, suppression are different requirements. Therefore, it is difficult to implement a universal antenna for many applications and conditions. Ideal for operating an antenna can be considered one that could predictably change the properties when adding (replacing) elements (modules), the parameters of which are known and consistent with the basic (basic) design. But serial antenna of radio electronic means is finished devices and are not always amenable to improvement. So the article discusses the possibility of using improvised antennas that have adequate models, as confirmed by numerous experiments, with the main parameters whose values can be purposefully changed: frequency range, width and shape of the directionality chart, its reflector properties, etc. An addition, software for such antennas is publicly available. Considering the functional requirements, we have analyzed the designs of antennae "Radiator over a cylindrical surface", angular antennas and antennas "Radiator over a plane", characteristics of which at the same sizes are approximately the same and are calculated by the same formulas. The possibilities of angular antennas of the "open-book" type with different angles between reflectors have been investigated. To do this, analytical simulations of technical solutions suitable for use in radio communications of units of law enforcement forces were conducted. The efficiency of the proposed constructs was checked and their characteristics were determined. Thus, the proposed technical solutions for angular antenna devices are able to protect the radio communication channels of law enforcement units during mass events.