Title :
Shielding Effectiveness Measurement of an Electrically Large Enclosure Using One Antenna
Author :
Qian Xu ; Yi Huang ; Xu Zhu ; Lei Xing ; Zhihao Tian ; Chaoyun Song
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Liverpool, Liverpool, UK
Abstract :
A new method is proposed to measure the shielding effectiveness (SE) of an electrically large enclosure. Traditionally, the SE measurement requires at least two (in an anechoic chamber) or three antennas (in a reverberation chamber). In this paper, only one antenna is needed in the whole measurement procedure. There is no requirement to use a reference antenna. It is interesting to note that if the aperture of the enclosure under test (EUT) can be covered (by using a conductive sheet or aluminum foil), the SE can be measured quickly by comparing the Q factor or the decay time of the covered and uncovered EUT. Measurements have been conducted to evaluate and verify the proposed method. The results are compared with those obtained using the nested reverberation chamber method; limitations of the proposed method are also discussed and identified. It is found that when the EUT is well shielded, the uncertainty of the proposed method could be relatively large. Nevertheless, the proposed method does offer a new simple and efficient approach to measure the SE of an electrically large enclosure.
Keywords :
Q-factor; anechoic chambers (electromagnetic); aperture antennas; electromagnetic shielding; reverberation chambers; Q factor; aluminum foil; anechoic chamber; antennas; conductive sheet; electrically large enclosure shielding effectiveness measurement; enclosure under test aperture; reference antenna; Antenna measurements; Apertures; Electric variables measurement; Q-factor; Scattering parameters; Time-domain analysis; Reverberation chamber measurement; shielding effectiveness;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
DOI :
10.1109/TEMC.2015.2477455