Design of Antenna Fields for HF Band Transmitting Radio Centers Based on Ultra-Wide-Band Antenna Systems

The current technical condition of antenna fields used in short-wave stationary transmitting radio centers is considered. The basic requirements for antenna systems used in radio centers to allow effective operation on routes having a length of 100‒5000 km are formulated. Models for the most common types of HF-band antenna systems constructed using electrodynamic modeling methods, which include logoperiodic, rhombic horizontal double, symmetrical horizontal vibrator, are described together with their energy and non-energy characteristics. Designs for a modified version of an ultra-wide-band logoperiodic structure and active phased array operating in the frequency range of 2–30 MHz are presented. Energy and non-energy parameters of existing and modified antenna systems proposed for replacement are compared. Presented results of track tests using existing and prospective antenna systems operating on a real object include an assessment of the effectiveness of each system on an average-length radio track (2100 km). The developed approach to constructing a high-frequency path of a transmitting radio center using ultra-wide-band pyramidal curved logoperiodic and pin antennas is based on calculated and experimentally obtained results. Active phased antenna arrays with controlled directional patterns developed on their basis are presented along with an appropriate antenna field layout variant.

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