Shielding effectiveness and S21 of a rectangular enclosure with aperture and wire penetration

Shielding effectiveness is a major problem to prevent electronic products from emission and radiation. This paper is written to present the measurement of shielding effectiveness (SE) and S₂₁ for such enclosure at frequencies below 1GHz. The measurement results indicate that a wire or cable penetrating into an enclosure has impact to the shielding effectiveness. The coupling between a wire penetration and a detector inside the enclosure show good agreement between experiment and simulation. The different length and direction of a wire penetration were used to interpret the theory. All results indicate the same resonant frequency approximately 707.1MHz for a 300 x 120 x 300 mm enclosure.