Equivalent impedance, a tapped parallel circuit impedance conversion - frequency study notes

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Equivalent impedance

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Similarly, the following tap circuit, the impedance may be obtained directly.

Using resonance conditions its resonant frequency can be obtained:
$w_pL_1+(w_pL_2-\frac{1}{wpC})=0$
$\bm{wp=\frac{1}{\sqrt{(L_1+L_2)C}}}$

To reduce the impact resistance of the signal source or load the resonant circuit, the signal source or a load resistor circuit is not directly connected, but after some simple conversion circuit, they are part of the access circuit.
Commonly used form of a transformer coupling circuit is connected, and a tapped autotransformer double tapped.

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Tapped impedance conversion circuit in parallel

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P <1, so $Z_{ab} < Z_{db}$ I.e., from low to high to tap the tap changer, the equivalent impedance increase $P^2$ -fold. Conversely, a high tap changer to tap low, reducing the equivalent resistance $\frac{1}{P^2}$Times.
Also tapped into similar.

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Transformer coupling link

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The main building relationships so that power equal to the coefficient obtained access

去抽头的时候各去各的就行，负载功率守恒，储能守恒。