Question
What is antenna gain?
Answer Options
- A) The additional power that is added to the transmitter power
- B) The additional power that is required in the antenna when transmitting on a higher frequency
- C) The increase in signal strength in a specified direction compared to a reference antenna
- D) The increase in impedance on receive or transmit compared to a reference antenna
Correct Answer: C
Explanation
Antenna gain is often misunderstood as power amplification. An antenna is a passive device and cannot create power. Instead, antenna gain is the increase in signal strength in a specified direction compared to a reference antenna (usually a theoretical isotropic radiator).
An antenna achieves gain by concentrating or focusing the radiated energy (T9A01) that it receives from the transmitter into a narrow, specific path. This focusing effect makes the signal appear stronger in the desired direction and weaker in other directions.
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