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

To determine the type of transmission line that has an inner conductor surrounded by an outer conductor, we can analyze the options provided:

1. Coaxial Cable: This type of transmission line consists of an inner conductor, which is surrounded by a concentric outer conductor, providing a good shielding effect and reducing electromagnetic interference.

2. Microstrip Line: This transmission line has a conductor on the top of a dielectric substrate with a ground plane beneath, rather than having an outer conductor surrounding it.

3. Balanced Line: This typically refers to a pair of conductors that carry equal and opposite currents, often used in audio and RF applications, but not as a surrounded configuration.

4. Strip Line: This consists of a conductor sandwiched between two ground planes, not an outer conductor in the coaxial sense.

Given this analysis, the correct answer is:

Final Answer

a. coaxial cable