Wilkinson Power Dividers

A Wilkinson power divider is a passive RF/microwave device that splits an input signal into two or more output signals with equal amplitude and phase, while maintaining impedance matching and providing high isolation between output ports.

It uses quarter-wave transmission lines and a resistor (typically between the output ports) to achieve equal power division, input/output matching, and isolation. The resistor dissipates power from any imbalance or reflected signals between the outputs.

Wilkinson power dividers are widely used in RF and microwave circuits for:

• Signal splitting or combining

• Antenna feed networks

• Test and measurement systems

• Phased arrays

• Power amplifiers

Unlike basic resistive splitters, the Wilkinson divider offers:

• Perfect impedance match at all ports

• High isolation between output ports

• Low insertion loss (ideally no power loss in balanced conditions)

Port isolation is the ability to prevent signals from one output port from leaking into the other. In a Wilkinson divider, the isolation resistor ensures minimal crosstalk between output ports, protecting connected components and reducing interference.

Yes. Because they are passive and reciprocal, Wilkinson dividers can also combine two signals into one—as long as the signals are in-phase and of equal amplitude. However, if the inputs are unbalanced, the isolation resistor will dissipate the excess power.

They are frequency-dependent and typically designed for a narrow bandwidth centered around a specific frequency. However, multi-section and broadband versions can cover wider frequency ranges.

• Narrow bandwidth (for single-section designs)

• Complex design for multi-way or broadband versions

• Not ideal for signals with large amplitude or phase differences when used as combiners

The resistor (usually between the output ports) provides isolation. It dissipates any power imbalance due to mismatches or unequal signals at the outputs, preventing it from reflecting back to the input.

Key specifications include:

• Frequency range

• Insertion loss

• Return loss (matching)

• Isolation between output ports

• Phase and amplitude balance

While the most common configuration is a 2-way divider, Wilkinson designs can be adapted for 3-way or more outputs, though with increased complexity. Custom configurations are available for specific system needs.

To place an order for ClearComm Wilkinson power divider  or any other RF products please contact us and we will help you!