High-power steerable short-wave antennas

The theoretical study and model measurements on a high-power, steerable shortwave antenna covers a spherical reflector, a parabolic reflector, and a log-periodic switch-steerable-type antenna. The scale modeling facilities are described and the modeling results are presented. The spherical reflector gives reasonable good azimuth and elevation steering over the shortwave band from 5.8 MHz to 27 MHz. The parabolic reflector gives good azimuth steering, with higher gain but no vertical steering. The log periodic antenna provides a high-gain switch-steerable antenna suitable for over-the-horizon radar detection