Abstract:

In order to effectively suppress electromagnetic injury, the electronic products shielding effectiveness of the cable holes was studied by TLM（Transmission Line Matrix）method in HEMP(High\|altitude Electromagnetic Pulse). In view of the echo strength and the reflecting surface shape, an irregular shielding cavity was designed for the first time to resist electromagnetic destruction which can reduce the electromagnetic wave entering cavity by enhancing echo and it was tested in non-shielded vehicles. The simulation results show that the electric shielding effectiveness of irregular cavity is higher than that of the cylindrical and rectang
ular cavity and the resonator is also small hence rationality and effectiveness of the design were verified which can provide a theoretical reference to the protection of the electronic control system for vehicles.

Key words: transmission line matrix, shielding effectiveness, irregular cavity, high-altitude electromagnetic pulse, circuit board