# design band stop filter

1. ## design band stop filter

hello ,what is the formula for calculating the capacitance and inductance for a microstrip technology for band stop filter,please •

2. ## Re: design band stop filter

To use basic formulas:

1) Start with ohmic resistance (R) in your signal path. Or estimate it as voltage divided by Amperes.

2) Calculate C to obtain an RC combination with the same rolloff frequency as your desired notch frequency.

3) Similarly calculate L to obtain an LR combination.

4) Make a tank circuit with values L & C. (This creates a resonant frequency which should equal your desired notch frequency.)
To get the steepest notch, you want high Q. To improve Q, minimize ohmic resistance in the tank loop. If the notch is too shallow then it should help if you increase L:C ratio.
Typically L is 100 to 100,000 times the C value. •

3. ## Re: design band stop filter

Helloi want the formula to calculate the width and length of capacitor and inductance on line microstrip for a filter stop band please •

4. ## Re: design band stop filter

Maybe you can search the web for a filter design software like FilPro. --[[ ]]--