Khi \(L_1 // L_2\) hoặc \(C_1\) nt \(C_2\):
\(\dfrac{1}{T_{nt}^2}=\dfrac{1}{T_1^2}+\dfrac{1}{T_2^2}\) \(f_{nt}^2=f_1^2+f_2^2\)
\(\dfrac{1}{\lambda^2}=\dfrac{1}{\lambda_1^2}+\dfrac{1}{\lambda_2^2}\) \(\dfrac{1}{C_b}=\dfrac{1}{C_1}+\dfrac{1}{C_2}\)
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