Wilkinson Power Divider Calculator

A Wilkinson power divider is an RF circuit that splits an input signal into two output ports while keeping them isolated from each other — used in antennas, amplifiers, and phased arrays. Enter your frequency, characteristic impedance (Z0), and output power ratio (PA/PB), then select an implementation type (Microstrip, Lumped Elements, or Stripline) to get the branch impedances Z1, Z2, and Z3, along with the isolation resistor (Rw) and quarter wave length.

MHz
Ω

1 = equal split, >1 = more power to port A

Results

Z1 Impedance

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Z2 Impedance

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Z3 Impedance

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Isolation Resistor (Rw)

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Quarter Wave Length

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Frequently Asked Questions

What is a Wilkinson Power Divider?

A Wilkinson power divider is a passive RF device that splits an input signal into two or more equal output signals with good isolation between output ports. It provides excellent port matching and isolation characteristics.

How do I choose the characteristic impedance Z0?

The characteristic impedance Z0 should match your system impedance, typically 50Ω for most RF systems or 75Ω for cable TV applications. This ensures proper matching and minimizes reflections.

What does the power ratio PA/PB represent?

The power ratio PA/PB determines how the input power is split between the two output ports. A ratio of 1 means equal split, while ratios greater than 1 direct more power to port A.

When should I use lumped elements vs microstrip implementation?

Use lumped elements (inductors and capacitors) for lower frequencies and compact designs. Use microstrip for higher frequencies where lumped elements become parasitic and transmission line effects dominate.

What is the purpose of the isolation resistor Rw?

The isolation resistor provides isolation between the two output ports, preventing coupling and improving port-to-port isolation. It's typically placed between the junction of the quarter-wave sections.

How accurate are these calculated impedance values?

The calculated values are theoretical and assume ideal conditions. In practice, consider parasitic effects, substrate properties, and manufacturing tolerances when implementing the design.

What frequency range is suitable for Wilkinson dividers?

Wilkinson dividers work best from HF to microwave frequencies. The quarter-wave requirement makes them frequency-dependent, though multi-section designs can provide broader bandwidth.