Enter your frequency, characteristic impedance (Z0), output power ratio (PA/PB), and implementation type into this Wilkinson Power Divider Calculator to find the Z1, Z2, and Z3 impedances, along with the isolation resistor (Rw) and quarter-wave length needed to design your divider network.
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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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.
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.
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.
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.
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.
The calculated values are theoretical and assume ideal conditions. In practice, consider parasitic effects, substrate properties, and manufacturing tolerances when implementing the design.
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.