An Experimental Investigation of the use of Q-Factor to Determine the Shielding Effectiveness of Electrically Large Equipment Enclosures with Apertures

The current method of obtaining a Shielding Effectiveness (SE) measurement involves field measurements both inside and outside the enclosure to be tested. In this paper, a relationship between the Shielding Effectiveness and the Q-factor of the enclosure under test (EUT) is investigated. Measurements are made in an anechoic chamber to obtain the Q-factor using a method previously detailed and to assess the Shielding Effectiveness of the enclosure under test. A relationship between Q-factor and shielding effectiveness is shown, and possible uses of this relationship are discussed.