Research on the lightning protection method for the low residual voltage and broadband based on the combined matching

In order to improve the bandwidth of the lightning protector with the quarter wavelength micro-strip line and reduce the output residual voltage, the combined matching design method of segmented microstrip line and series inductance is proposed in this paper. Shortage of the quarter wavelength microstrip line arrester is analyzed by simulation. The series inductance and segmented microstrip lines of the protection circuit is optimized by simulation, and the bandwidth of the lightning protection circuit is expanded. The simulation result shows that the protective circuit has good voltage standing wave ratio(VSWR), and broadband characteristic between 1 GHz and 3 GHz. The combination matching is achieved between devices using voltage gradient method. When the lightning magnetic pulse with 1.2/50 μs & 8/20 μs and 10 kV peak voltage is injected into the input port of combined protective circuit, the residual voltage on the output port is 79 V. The protective circuit by used the combined matching method has the characteristics of wide bandwidth, low residual voltage and easy to tune. It can be used for the antenna-fed lightning protection.