Effect of inductance on characteristics of a distributed RC notch filter

A small notch inductance L
n
in a distributed RC notch filter can drastically shift the location of the optimum notch frequency. Experiments on an A1-Y
2
O
3
- NiCr evaporated thin-film filter yielded a shift of -32 percent in optimum notch frequency by the addition of L
n
=0.9 µH, in agreement with predictions.