METRIC AND DECIMETRIC WAVES' BROADBAND AERIAL WITH PHASE VELOCITY MODULATION

摘要

This invention relates to aerials of all VHF and UHF waves. The proposed broadband rod aerial for UHF wave range is distinguishable by containing:a) an array sheet of a logo-periodical pattern consisting of a chain of linear and parallel directors layout of which is featured by specific geometric relationships (the length of and distance between vibrators);b) high-frequency voltage supply and array sheet interface containing a two-wire delayer (for example, 300Ωcable piece with 80 mm long braiding for transformation of input resistance that is approximately 1,200Ω), a balancing bridge, a reducing cable with 75Ωresistance and a reflector, which distinguishes with the purpose to construct an aerial with optimum dimensions and gain 12 to 16 decibels, length li of the directors and distance a1 there between in the direction away from the reducing cable connection points decreases in accordance with the following geometric progressions :ai = a0τ (1),li = l0τ (2),where: i = 1, 2, 3,...,n is number of directors.a0 = 0.0911 R - distance in mm between reflector and first director;l0 = R - optimum reflector length;τ- optimum similarity ratio of director array, which is equal to the length ratio of the adjacently positioned directors (shortest to longest) and depending on the selected wave band; in UHF wave band from channel 21 to channel 72 with simultaneous frequency coverage from 470 MHz to MHz (at 1.9 coverage ratio) n = 26,τ= 0.95065 and R = 475 mm.li - length of i-director,ai - distance between i-director and i+1-director, as well as distinguishable in the places of laying the delaying electrically insulated wires, which are fixed at 0.25 li distance, counting from the director ends.Similar aerials are proposed for VHF wave bands 46.25 MHz to 68 MHz and 175 MHz to 231 MHz at gain 9 to 12 decibels.