Which component is used at both ends of transmission lines to connect to the termination device?

• A. Junction
• B. Adaptor
• C. Coupler
• D. Connector

Answer: (D)

Connectors provide the detachable, impedance-matched interface at both ends of a transmission line to connect to the termination device. They are designed to mate with the corresponding ports on equipment, preserving the line’s characteristic impedance and allowing easy attachment and detachment without introducing reflections. A junction is an internal node or branching point, not a detachable end connection. An adaptor changes connector types or impedances, but isn’t the standard end-to-end interface used at every connection to a termination device. A coupler transfers a portion of the signal between lines and isn’t simply an end connector. So the best choice is the connector.