METHOD FOR MODIFYING REFLECTOR FOR MIRROR-MODIFYING ANTENNA

摘要

PURPOSE:To obtain a highly accurate formed beam antenna capable of simply modifying a mirror face and having a smooth mirror face by finding out points on a reflector so that a phase obtained by the length of a path from a feeding horn up to the aperture face of a reflector through the reflector is made equal to optimized phase distribution. CONSTITUTION:The phase distribution on the aperture face of the reflector is optimized in accordance with the sectional shape of a prescribed formed beam obtained from the antenna consisting of one feeding horn and one reflector, and in order to attain the phase distribution, points on the reflector are found out so that the phase obtained by the length of the path from the horn up to the aperture face of the reflector through the reflector is made equal to the optimized phase distribution. These points are interpolated to constitute the reflector. For instance, the phase distribution is optimized so that the sum of the square of a difference between the objective gain of a gain restricting point 4 in a remote field and antenna gain is minimized in the amplitude distribution on the aperture face of the reflector 2 which is determined by the radiation characteristic of the horn 1. Consequently, the mirror modification can be comparatively simplified, the mirror face can be smoothly formed and high accuracy can be obtained.