Filters can be designed quickly and easily in Gapher using the inbuilt Filter Calculator. Select the type of filter and enter its parameters and Gapher will calculate the width and length of all the micro-strip lines or lumped components. There is a choice of Butterworth or Chebyscheff, Low pass, High pass, Band pass or Band Stop, Transmission line, Lumped or Coupled (only for band pass) parts.
Using the Filter calculator window to design a 2.4 GHz band pass filter with coupled lines, simply by selecting the type of filter and entering it’s parameters.
Send the parts to the Parts window and add the ports.
Create the circuit in the Circuit window and simulate.