(Impedance matching (Impedance matching) is a part of microwave electronics. It is mainly used on transmission lines to achieve the purpose that all high-frequency microwave signals can be transmitted to the load point, and no signal will be reflected back to the source point, thereby improving power efficiency. . Generally speaking, there are two kinds of impedance matching, one is by changing the impedance force (lumped-circuit matching), and the other is adjusting the impedance matching.)