What is a Bias Tee?

Bias tees are the components, that are used to supply DC currents or voltages to bias RF circuits. A Bias tee is a three-port device. The structure of the device can be seen in the figure below. A signal that consists of RF + DC is incident at Port 1 of the Bias Tee. The capacitor blocks all DC signals from getting through to Port 2 and only allows the AC/RF Signals to pass through.

Whereas, the inductor in the circuit blocks all RF signals from getting through to Port 3 and allows all DC signals to get through.

A Bias Tee can be thought of as a diplexer with an ideal capacitor that allows AC through but blocks the DC bias and an ideal inductor that blocks AC but allows DC.

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