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Abstract
Because of the importance of the electromagnetic interference resistance in the modern life, the electromagnetic shielding of the piezoelectric vibration acceleration sensor is analyzed in this paper. The shell of the piezoelectric vibration acceleration sensor is taken as a three-layer rectangular cavity with apertures. The shielding effectiveness of the shell irradiated by plane electromagnetic wave is modelled using transmission line theory. In the modeling process, incident angle and polarization angle of the plane electromagnetic wave are introduced, and the scattering voltage produced on the outer aperture is taken as the radiation source. The aperture is taken as the asymmetrical coplanar stripline and the rectangular cavity is taken as a rectangular waveguide with one end completely open and another end completely closed. The shielding effectiveness of the cavity is calculated using transmission line theory. Compared to the others before, this method improves the completeness of the model, computation speed, and the shielding effectiveness which supplies good reference for engineering practice.