Tapped Inductor Matching
The impedance transformation ratio and Q-factor/matching bandwidth of the circuit can be set independently. A tapped inductor matching circuit is shown in Fig.1
From Fig.1, Q-factor of branch is given by,
At resonant frequency the circuit is redrawn, by parallel-to-series transformation, as shown in Fig.1(b).
Fig.1(c) illustrates the parallel R-L-C resonant circuit form of tapped inductor matching circuit.
When and , using Eq.(7)
When Q-factors are large, from Eq.(7), we can conclude that the impedance transformation ratio is a function of inductors tap ratio. Hence the name tapped inductor matching for this matching circuit.