Which term describes the device that increases the amplitude of a signal in a wireless link?

• A. Carrier Wave
• B. Datalink
• C. Noise
• D. Antenna Gain

Answer: (D)

Antenna gain is about how much energy an antenna concentrates in the direction you care about. In a wireless link, increasing the antenna’s gain focuses more of the transmitted power toward the receiver, which raises the signal amplitude that arrives and improves the link quality. It’s a directional effect, not adding new power itself, but redistributing it to the forward direction. That’s why this term best describes a device that increases signal amplitude in the link.

The other terms don’t fit: the carrier wave is the basic waveform that carries information, the datalink refers to the overall data communication path, and noise refers to unwanted random signals.