The technologies for reducing quiet zone level of anechoic chamber

In designing of anechoic chamber with higher quality, when requirements of quiet zone index are higher, it must use the geometrical theory of diffraction instead of the geometrical optics for accuracy. The utilities of the theory in design have been discussed in this paper. Besides, in analysis of reflectivity versus incident angle of absorbing materials, it´s used to use linear interpolating method and results in considerable error. In the present paper, new relationship between reflectivity and incident angle of absorbing materials has been derived from the theory of electromagnetic field. It has been demonstrated that new relationship can eliminate the error.