The following table shows $2$ L$-$section designed to match load impedance ZL $=150$ j $80(150$ and $1\mathrm{.}768$ pF$)$ to transmission line characteristic impedance Zo$.$ The equivalent impedance of each L$-$section is traced by using network analyzer for certain band of frequency as shown on the right to every section.

a$.$Briefly explain, in the middle column, how perfectly every L$-$section is properly designed to achieve such matching.

b$.$Use the above information to determine $($show details of calculation$)$ the generator frequency fg$?$