D D$13\mathrm{.}4.$ Parameters for the planar transmission line shown in Fig. $13\mathrm{.}4$ are $b=6mm,d=0\mathrm{.}25mm,t=25mm,{}_c=5\mathrm{.}5{10}^7\frac{S}{m},lo{n}^{\text{'}}=25p\frac{F}{m},={}_0,$ and $\frac{}{}lo{n}^{\text{'}}=0\mathrm{.}03.$ If the operating frequency is $750$ MHz $,$ calculate: $($a$)$; $($b$)$; $($c$)Z_0.$

Ans. $0\mathrm{.}470N\frac{p}{m}$;$26\mathrm{.}4ra\frac{d}{m}$;$\frac{9\mathrm{.}34}{{?}_{0\mathrm{.}699}}.$