All the segment lengths are chose to be len = 37.5mm, which is a quarter wavelength at the center frequency of the filter f<sub>o</sub> = 2GHz. TEM [[Transmission Lines|transmission lines]] with ε<sub>eff</sub> = 1 are assumed. The impedances have been chosen to achieve an equal-ripple bandpass filter design.
Run a network analysis of this two-port circuit. Set the start and stop frequency of the sweep to 1GHz and 3GHz, respectively, with a linear step of 10MHz. Generate an amplitude-only, Cartesian graph of the S-[[parameters]]. specified below: {| border="0"|-| valign="top"||-{| class="wikitable"|-! scope="row"| Start Frequency| 1G|-! scope="row"| Stop Frequency| 3G|-! scope="row"| Steps/Interval| 10Meg|-! scope="row"| Interval Type| Linear|-! scope="row"| Parameter Set| S|-! scope="row"| Graph Type| Cartesian (Amplitude Only) with Decibels |} The figure below shows the graph of S11 and S21 [[parameters]]. Note that a linear scale is used for frequency. The filter has a center frequency of f<sub>o</sub> = 2GHz with a 3dB bandwidth of about 235MHz. The response drops to -45dB at 1.5GHz and 2.5GHz.
<table>