“…In operating systems, mainly linear [7,9,12,16,[18][19][20][21][22] and planar [7,10,11,[13][14][15][16][17]24] antennas of diffraction radiation were used. In the radiator of a linear antenna, the grating width and the effective width of the open (dielectric) waveguide are from half to two wavelengths, and the length of the radiating aperture is from several tens to several hundred wavelengths.…”