Dual-reflector compact range modelling: geometrical theory of diffraction analysis and sub-millimetre quiet-zone computation

摘要

The growing need to study large antennas at high frequencies (υ > 100 GHz) in compact range devices requires the use of methods adapted to electrically large systems,and offering reasonable computing time. The uniform geometrical theory of diffraction (GTD) is used for dual-reflector compact range analysis. This method is compared with standard physical optics, which have been validated by measurements. At 10 GHz, the differences between the methods are very small and the time needed for a compact range analysis is less than 3 h. We have shown that a modelling of large compact range operating at millimetre and sub-millimetre wavelength is possible using the GTD which offers the advantage of being frequency independent. The problem of surface accuracy which has a major impact at high frequencies will be treated briefly.