Question
What does “front-to-back ratio” mean in reference to a Yagi antenna?
Answer Options
- A) The number of directors versus the number of reflectors
- B) The relative position of the driven element with respect to the reflectors and directors
- C) The power radiated in the major lobe compared to that in the opposite direction
- D) The ratio of forward gain to dipole gain
Correct Answer: C
Explanation
The front-to-back ratio is a critical performance metric for directional antennas like the Yagi. It is a measure of the antenna’s ability to concentrate power in the intended direction and suppress power in the opposite direction.
It is defined as the power radiated in the major lobe (forward direction) compared to that in the opposite direction (backward direction). A high front-to-back ratio indicates a very effective reflector and director system, meaning the antenna is highly immune to interference coming from behind it.
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