Technician 2026-2030T9A11
What is antenna gain?
C
Answer
Antennas and feed lines
Type
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
Answer Notes
It is important to remember that an antenna is a passive device; it cannot magically create more power than the transmitter supplies to it. Instead, antenna gain refers to the antenna's ability to focus the available radio frequency energy in a specific direction.
By shaping the radiation pattern to send more energy in a desired direction (and less in others), the signal strength appears greater to a receiver located in that path. This apparent increase is always measured by comparing it against a standard reference antenna, such as a theoretical isotropic radiator or a basic half-wave dipole.
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In which direction does a half-wave dipole antenna radiate the strongest signal?
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