抄録
In order to increase the receiving power of the Fresnel-zone plate antenna suitable for the reception of signals from multiple Television-Broadcasting satellites, a reflector-type antenna is developed where an additional reflector plate provided 1/4 of a wavelength behind the Fresnel-zone plate with a the dielectric material. Received power and phase for the oblique incident waves are calculated on the basis of traditional ray theory and the antenna's configuration using Kirchhoff's diffraction-integral equation. The correction by the transmission characteristics of the dielectric substrate plate, which also works as a phase shifter, is conducted experimentally. The result was that a good image is received when the angle of incidence is less than 30 degrees and the level of power received at the fabricated multi-beam reflecting antenna is in good agreement with the results of calculation. When combined with a horn receiver, this reflector antenna achieved the high value for aperture efficiency of 22 % for the perfect TV.
