lumped element filter designer
to go to our main filter page
here to go to our lumped filter page
here to go to our other lumped filter calculator page
Vlad contributed a simple yet
powerful tool for synthesizing lumped element filters. It's available
in our download area. This
page will help you use it. Here's a quote from someone who used
I just ran "Vlad's filter designer program", and so
far as I can tell, it is awesome! I mean, it has the three basic
qualities of a good application: it's SIMPLE, it uses the same
terminology used in verbal expression, and it's FREE! Hats off
to you Vlad, whomever you may be!
Tis executable file calculates
Butterworth or Chebyshev filters, up to 11 poles. It can analyze
low pass, bandpass or high-pass filters, in a tee or pi topology.
You enter the filter's bandwidth
parameters (passband, ripple and characteristic impedance) and the
calculator returns the ideal lumped element values (inductors and
capacitors). It gives you an display of the filter's response including
S21 (labeled ATT) and S11. The number of points calculated is fixed
Keep in mind, for a true microwave
filter, you'll need perform further analysis and adjustments because
lumped element parasitics affect the filter's response, using a
more sophisticated tool such as Agilent's ADS or Microwave Office.
One of these days we'll post an example that includes these details.
Here's a screen capture of the
calculator in action.
The axes can be adjusted by right
clicking inside the graph, which reveals a menu for adjusting the
X and Y coordinates of the graph.
There's a shortcut we discovered.
You can also zoom in and out by clicking and dragging a box around
where you want to magnify (top left to bottom right):
Which results in
If anyone has any suggestions
for improvements, send them our way and we'll pass them along to
Vlad. He's done a great job on this calculator!