for a coaxial transmission line with an inner conductor diameter of 0.5cm and outer conductor diameter of 1cm the line parameters R'=0.788n L'=139nH/m, G'=9.1mS/m and C'=181 pF/m. find the following (a) attenuation constant a (b) phase constant (c) characteristics impedance z0 and 9 (d) phase velocity. the operating frequency is 1GHz