An impulse electromagnetic interference shielding based on a diode grid

It is necessary to protect electronic components and systems from the intentional or unintentional broadband impulse electromagnetic interference (EMI). The previously reported shielding permits the waves in the desired frequency band to be transparent, and stop the wave in the other frequency bands. This paper proposes a new impulse EMI shielding based on a diode grid. The proposed shielding is transparent to the electromagnetic wave when it is weak, but prevents the incident wave from transmitting when it is strong. The shielding permits the electronic systems to communicate with each other in a normal electromagnetic environment, but protects them from the intentional impulse EMI. The effectiveness of the shielding is evaluated using Wavenology™, a commercial full wave transient field simulator integrated with the nonlinear SPICE circuit solver. The paper also discusses the dependence of shielding on some important design factors such as the electromagnetic frequency and the size of the unit cell.