阿摩線上測驗
題組內容
Problem 2 A air-filled coaxial with dimensions as shown in the following figure:
Figure (c) a coaxial transmission line with signal carrying conductor of radius a inside the surrounding ground of radius b.
The inductance per unit length is
(H/m), Here we have assumed that the current 8元 2元 inside the signal-carrying conductor is uniformly distributed.And, the capacitance per unit length is 
b. (5%) The characteristic impedance is defined as 
, find out the characteristics impedance at high frequencies, and please indicate the unit for it.