Question
What is the purpose of using multiple driven elements connected through phasing lines?
Answer Options
- A) To control the antenna’s radiation pattern
- B) To prevent harmonic radiation from the transmitter
- C) To allow single-band antennas to operate on other bands
- D) To create a low-angle radiation pattern
Correct Answer: A
Explanation
Multiple driven elements (unlike parasitic elements in a Yagi) are individual radiators that are all directly fed by the transmitter. The key to their operation is controlling the phase and amplitude relationship between them. This precise control allows for the synthesis of complex radiation patterns.
The essential purpose of using multiple driven elements connected through phasing lines is to control the antenna’s radiation pattern. By setting the relative phase of the signal fed to each element (e.g., 0^\circ, 90^\circ, 180^\circ), the operator can steer the maximum direction of radiation (e.g., end-fire, broadside, or switch the beam direction) and achieve high gain or a specific null pattern.
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