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L Network Matching Calculator
Design an ideal RF L-network match between two real resistances. Calculate loaded Q, series reactance, shunt reactance, and low-pass L/C component values.
Input Parameters
Results
Equations Used
Resistance Ratio: Rhigh / Rlow
Loaded Q: Q = √(Rhigh / Rlow - 1)
Series Reactance: Xs = Q × Rlow
Shunt Reactance: Xp = Rhigh / Q
Low-Pass Realization: Series L = Xs / (2πf), Shunt C = 1 / (2πfXp)
Frequently Asked Questions (FAQ)
Q1: What does an L-network matching calculator do?
It calculates ideal L and C values to match one real resistance to another at a chosen frequency.
Q2: Can this match complex impedances directly?
This version assumes real source and load resistances. Complex loads should first be transformed or tuned using RF design methods.
Q3: What is the difference between low-pass and high-pass L networks?
They use different inductor/capacitor placement but can provide the same impedance transformation at the design frequency.
Q4: Why does matching network Q matter?
Higher Q means narrower bandwidth and greater sensitivity to component tolerance and parasitics.
Q5: Are the calculated values exact in real PCBs?
No. PCB parasitics, component Q, self-resonance, layout, and load variation affect the final match.
