Simulation Of Shielding Effectiveness For The Cavity With Slots Based On The FDTD Method

Discreting the Maxwell curl function in time and space,finite difference of time do-main(FDTD) method makes use of difference quotients with two order accurancy to replace differential in original equations.In this paper, FDTD method was used to research shielding effectiveness for the cavity with slots. We also introduce the principle of FDTD method, discuss the numerical disper-sion relation,and show the courant stability conditions of the FDTD method on the space stepΔx and the time stepΔtIn the third chapter Mur and PML absorbing boundary conditions were derived, and FDTD discrete difference scheme in the absorbing boundary was presented.FDTD method was used to construct the mathematical model for the cavity with slots, and simulate the influence of cavity aperture on the shielding effectiveness.By comparing the TLM method, the correctness of the FDTD method was proved. According to the discussion above, the NEMP excitation source and the cavity with the hole of bilateral symmetry were discussed respectively.In the papter the Faraday loop method was applied on the electromagnetic shielding effectiveness of the cylindrical cavity with slots,and introduced the conformal mesh method of FDTD in 3D.Combined with the matlab programming.then analyzed the effect of open-ing on the missile's side wall to the shielding effectiveness for electronic equipments in the missile's body. Compared the effect of the shielding with different shape openings having the same area.