Question
What is a beam antenna?
Answer Options
- A) An antenna built from aluminum I-beams
- B) An omnidirectional antenna invented by Clarence Beam
- C) An antenna that concentrates signals in one direction
- D) An antenna that reverses the phase of received signals
Correct Answer: C
Explanation
A beam antenna is a type of directional antenna, meaning it does not radiate equally in all directions. Instead, it is designed to concentrate signals in one specific direction (or a narrow range of directions), much like a flashlight focuses light into a beam.
This concentration of energy results in antenna gain (T9A11), which increases the effective radiated power (ERP) on transmit and increases the signal strength on receive. Common examples include the Yagi and the Quad antenna, which are popular for VHF, UHF, and HF weak-signal work.
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