Polarisation efficiency in radiated susceptibility testing

Authors:

  • Höijer Magnus

Publish date: 2005-01-01

Report number: FOI-R--1714--SE

Pages: 42

Written in: English

Abstract

At Radiating Susceptibility Testing of electronic equipment against High Power Microwaves, the result depends strongly on the applied polarisation. It is not affordable to apply many different polarisations. Therefore only a few different polarisations are applied. This report quantifies the error introduced by applying only a few different polarisations. The report does also tell which polarisations are the most optimal to use if the maximum possible error are to be minimised. Under some common conditions, described in the report, it is optimal to apply circular polarisation when only one polarisation is used. If more than one polarisation is applied consecutively, it is optimal to apply linear polarisations. At the trade-off between accuracy and affordability, we have developed a criterion showing that two or three different polarisations are optimal. By applying unpolarised field, the error is deterministically -3 dB.