題組內容

Problem 2
 A air-filled coaxial with dimensions as shown in the following figure, 
62f46bf6b6b07.jpg Figure (e) a coaxial transmission line with signal carrying conductor of radius a inside the surrounding ground of radius b. The inductance per unit length is62f46c353e5db.jpg. Here we have assumed that the curent inside the signal-carrying conductor is uniformly distributed. And, the capacitance per unit length is 62f46ca25f453.jpg.

a. (5%) For the inductance, which term drops off at high frequencies? Why?