Test and research on shielding performance of aluminized glass fiber electromagnetic shielding material based on finite element method

Abstract

A research method of shielding performance of aluminized glass fiber electromagnetic shielding material based on finite element method is proposed. The proposed method is based on the traditional Maxwell equation and adopts the finite element method. Firstly, the analyzed object is divided into finite elements. Through the initial conditions and boundary conditions such as medium, field source conditions and field distribution, the magnetic potential and potential of each element under certain conditions are calculated, and its magnetic field efficiency is calculated, and then its anti-interference efficiency under various conditions is compared. The simulation results show that in the frequency range of 0.1 GHz∼1 GHz, with the increase of the length and thickness of the cut-off wave guides, the shielding effectiveness of the shielding box is improved by more than 15dB, and the circular and rectangular cut-off Wave guides have little effect on the shielding effectiveness. Choosing the length and thickness of cut-off wave guides reasonably according to the actual situation can improve the electromagnetic anti-interference ability of weak signal processing circuit.