No.5（2002）9.Evaluation of shielding effectiveness regarding flat board with aperture

Yukio TERAI, Takasi AMAHAYA, Yasuhiro SHIMIZU and Masuo USUI

Equipment to evaluate shielding effectiveness was produced assuming an application to the enclosure of electronic equipment containing various holes. It was composed of an electromagnetic shielding box, containing an opening in order to fix a sample of flat board sandwiched in the box and two electrodeless discharge lamps into the box. This equipment made possible the measurement of shielding effectiveness of approximately 30 dB in a frequency range from 30 MHz to 650 MHz by utilizing an automatic system of an anechoic chamber. In addition, assuming a simple enclosure model with an aperture using the FDTD method, a resonant frequency analysis was carried out.

Keywords
Shielding effectiveness, Enclosure, Aperture, Electrodeless discharge lamp

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