Transmission line type having inner conductor surrounded by outer conductor isSelect one:a. microstrip lineb. coaxial cablec. balanced lined. strip line

Step 1: Break Down the Problem

We need to identify the type of transmission line described in the question, which has an inner conductor surrounded by an outer conductor.

Step 2: Relevant Concepts

1. Microstrip Line: A flat conductor on a dielectric substrate, exposed to the air on one side.
2. Coaxial Cable: Consists of an inner conductor surrounded by an outer conductor, usually separated by an insulating material.
3. Balanced Line: Requires two conductors that are balanced in terms of impedance.
4. Strip Line: A transmission line consisting of a conductor sandwiched between two ground planes.

Step 3: Analysis and Detail

• The definition provided in the question specifically matches coaxial cable, where an inner conductor is indeed surrounded by an outer conductor, usually formed as a cylindrical shield.
• Other options do not meet this definition clearly:
  • Microstrip lines are not surrounded by an outer conductor.
  • Balanced lines do not refer to a single inner conductor.
  • Strip lines are enclosed and aligned between two ground planes rather than having a separate outer conductor.

Step 4: Verify and Summarize

After analyzing each option, it is evident that the type of transmission line that fits the description of having an inner conductor surrounded by an outer conductor is the coaxial cable.

Final Answer

b. coaxial cable