Aufbau und Wirkungsweise von reflex-ionsarmen Trichter- und Rechteck-kammern fur Antennenmessungen 'Design and Function of Anechoic Funnel ar' Rectangular Chambers for Antenna Tests'

摘要

Absorbers are discussed for electromagnetic waves. Methods for measuring reflections of absorbers and anecheie chambers are presented. It is proposed to determine reflection coefficients of thick absorbers according to the VSWR method. The field strength distribution at the receiving point in a funnel chamber is computed approximately and compared with the measured values. A model is used to test the function of a funnel chamber in the lower frequency range For the determination of the reflectivity generally applicable rules are established in order to enable a Comparison of the quality characteristics of different anechoic chambers. The pros and cons of both types of anechoic chambers are compared on basis of the data available for the funnel and rectangular chambers of the Pernmeldetechnisches Zentralamt. The measured values are statistically analyzed by a frequency distribution of the reflectivity.