Question
Which of the following describes a type of antenna loading?
Answer Options
- A) Electrically lengthening by inserting inductors in radiating elements
- B) Inserting a resistor in the radiating portion of the antenna to make it resonant
- C) Installing a spring in the base of a mobile vertical antenna to make it more flexible
- D) Strengthening the radiating elements of a beam antenna to better resist wind damage
Correct Answer: A
Explanation
Antenna loading is a technique used to make a physically short antenna act as though it is electrically longer than its physical length. This is necessary for mobile or restricted-space antennas, especially on the low-frequency HF bands where full-sized antennas would be impractical.
This is typically accomplished by electrically lengthening the antenna by inserting inductors (coils) in the radiating elements. The inductor adds a specific amount of inductance that cancels out the antenna’s natural capacitance, making the entire structure resonant (tuned) at the desired operating frequency.
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