A biaser is mainly used to inject DC current or voltage into an RF circuit without affecting the RF signal passing through the main transmission path. The DC port of the biaser consists of a feed inductor, which is used to add a DC bias and prevent the AC signal at the RF port from leaking to the power supply system. Under ideal conditions, the DC end will not have any impact on the RF end signal; the RF port consists of a blocking capacitor, which is used to input the RF signal and can also block the DC voltage at the bias port. Through this design, a single RF cable is used to simultaneously transmit DC and RF signals to a remote end.