Design a stepped-impedance low-pass filter having a cutoff frequency of 3 GHz and a fifth-order 0.5 dB equal-ripple response. Assume
(a) Find the required electrical lengths of the five sections, and use CAD to plot the insertion loss from 0 to 6 GHz. (b) Lay out the micro strip implementation of the filter on an FR4 substrate having
d = 0.079 cm, and tan δ = 0.02, and with copper conductors 0.5 mil thick. Use CAD to plot the insertion loss versus frequency in the pass band of the filter, and compare with the lossless case