This sheet is used to design microwave stepped impedance filters where each section is of the same length.The maths for this are from "Theory & Design of Microwave Filters", Ian Hunter, IEE Press.
There are three steps to this filter design:
Step 1
, Get the filter g-values.This sheet calculated these values according to the Chebychev polynomial.Other sources of g cannot be used here as the g-values are modified by the length of the transmission line.
Step 2
, Calculate Zo and wavelength depending on the type of filter.
This MathCAD sheet stops at this point.
Step 3
, Calculate length and width.One method is to use Linecalc which is part of ADS.For microstrip designs I have written a MathCAD sheet which is available from my wepage that works well for thin tracks, less well for thicker tracks. Also you can try
transcalc.sourceforge.net
for a Linecalc equivalent.
Yellow is user input, Green is output