Design a lowpass filter with Chebyshev response, three$-$pole. Then transform the filter from LC to TLine and then transform the circuit from LC$,$ TLine to Microstrip.

Filter Design Parameters:

Cut$-$off frequency, $F_p=1GHz$

Stopband Frequency Edge, $F_s=3\mathrm{.}2GHz$

Passband attenuation, $A_p=0\mathrm{.}1dB($or return loss $-16\mathrm{.}42dB)$

Stopband attenuation, $A_5=20dB$

Source $/$ load impedance, $Z_0=50$

Order: $3($adjust automatically according to previous parameters$)$