DC Block / Bias Tee (if applicable)

A DC Block/Bias Tee is a three-port network device used in RF and microwave systems, particularly in Local Oscillator (LO) inputs. It combines or separates DC power and RF signals on a single transmission line. The DC Block prevents DC voltage from passing to sensitive RF components while allowing RF signals through, and the Bias Tee injects DC bias into RF lines without disrupting signal integrity. In LO applications, it ensures stable oscillator operation by providing clean DC power to active devices while isolating RF output.

The device operates using frequency-selective networks: a capacitor blocks DC but passes RF signals (DC Block function), and an inductor passes DC but blocks RF signals (Bias Tee function). In a typical configuration, the RF port connects to the LO input, the DC port supplies bias voltage to active components like amplifiers or mixers, and the combined port handles the integrated DC+RF signal. This allows simultaneous transmission of power and data without interference.