An Experiment in Reducing Reflections in a Shielded Room

Abstract

This paper discusses the result of an experiment to reduce the reflections in a shielded room. Data is shown for a shielded room with no anechoic material, with some "horsehair" type material, and with some broadband pyramidal material. Amplitude variations as a function of antenna position have been reduced from greater than +-30dB (bare room) to less than +-4dB (pyramidal material) for antenna movements of +-lft horizontal and +-6inches vertrical from a reference.