Practical Electronics/Tuned Resonance Selected Band-reject

R - LC

Characteristics

${\frac {V_{o}}{V_{i}}}={\frac {j\omega L+{\frac {1}{j\omega C}}}{R+j\omega L+{\frac {1}{j\omega C}}}}$

$T=RC$

$\omega _{o}={\frac {1}{T}}={\frac {1}{RC}}$

R - LC//

Characteristics

${\frac {V_{o}}{V_{i}}}={\frac {j\omega C+{\frac {1}{j\omega L}}}{R+j\omega C+{\frac {1}{j\omega L}}}}$

Summary

The two configurations above can be used for Tuned Resonance Selected Band Reject Filter