Measurement of the Reflectivity of Radio-wave Absorbers

  1. French College of Metrology
  1. Frédéric Pythoud

Published Online: 3 FEB 2010

DOI: 10.1002/9780470611371.ch42

Transverse Disciplines in Metrology

Transverse Disciplines in Metrology

How to Cite

French College of Metrology (2009) Measurement of the Reflectivity of Radio-wave Absorbers, in Transverse Disciplines in Metrology, ISTE, London, UK. doi: 10.1002/9780470611371.ch42

Author Information

  1. Swiss Federal Office of Metrology METAS 3003 Bern-Wabern (Switzerland)

Publication History

  1. Published Online: 3 FEB 2010
  2. Published Print: 1 JAN 2009

ISBN Information

Print ISBN: 9781848210486

Online ISBN: 9780470611371



  • absorbers;
  • metal plate;
  • metal reflections;
  • measurement setup;
  • normal incidence


The precise knowledge of the reflectivity of radio-wave absorbers is a very important factor in the proper design of an anechoic chamber. We propose a new and simple method in order to characterize the reflectivity of absorbers at normal incidence in the frequency range from 80 MHz to more than 15 GHz. The method is derived from the “VSWR (Voltage Standing Wave Ratio) method”, with numerical and technical improvements. The advantage of this method is that it does not require a dedicated infrastructure like a wave guide or a special arch. We even believe that it is more accurate than traditional methods at frequencies around 1 GHz. The method is illustrated by the measurements performed using different types of absorber technologies.