A coaxial cable has a solid copper inner conductor of radius a=1 mm and a copper outer conductor of inner radius b. The outer conductor is much thicker than a skin depth. The dielectric has εr=2.26 and σ eff =0.0002 at 1GHz. Letting the ratio b/a vary from 1.5 to 10 , generate a plot of the attenuation (in dB/m ) versus the line impedance. Use the lossless assumption to calculate impedance.