Shielding Effectiveness Testing of Space Blanket
The testing of a space blanket was performed at two different times. These were (1) at DNB Engineering in Fullerton California and (2) a demonstration at the 1999 EMC Symposium in Seattle, Washington. The testing which was performed at DNB Engineering used both an electric and magnetic dipole antenna as the source of the wave. The shielding to the E and H fields was recorded. The significant findings were that no H field shielding was detected and that there was not a shielding effectiveness when the wave impedance was less than the impedance of the barrier. An analysis using the accepted theory of shielding is illustrated using the test conditions associated with the test at DNB Engineering. The results of the analysis are compared with the recorded E field shielding. The comparison between the analysis and the E field shielding is presented, where there is a correlation; however, there is a significant difference in the magnitude. The test which was illustrated during the demonstration in Seattle showed that (1) no H field shielding was detected; and (2) the impedance of the wave leaving the barrier was equal to the impedance of the barrier.
KeywordsShielding effectiveness Reflective loss Absorption loss Re-reflection coefficient Shielding effectiveness testing Space blanket Electromagnetic wave Shielding theory Shielding practice E field shielding H field shielding
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