Which components transmit high-frequency voltage communication signals in transmission lines?

Coupling capacitors are specifically designed to transmit high-frequency voltage communication signals in transmission lines. They facilitate the coupling of AC signals from one part of a circuit to another while blocking direct current (DC). This ability is crucial for maintaining the integrity of communication signals that typically operate at higher frequencies. By allowing these signals to pass while preventing the DC component from interfering, coupling capacitors help ensure effective communication in power systems and during relay operations.

In contrast, other components serve different purposes in electrical systems. Voltage regulators are primarily used for maintaining a consistent output voltage despite variations in input voltage or load conditions. Transformers are designed for voltage conversion and energy transfer between circuits using electromagnetic induction, rather than communication purposes. Circuit switches are utilized for disrupting or completing electrical circuits, effectively controlling the flow of electricity, but they do not transmit high-frequency signals. Hence, coupling capacitors are the key components for high-frequency voltage communication in transmission lines.