Question
Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?
Answer Options
- A) Installing a ground radial system
- B) Isolating the coax shield from ground
- C) Shortening the radiating element
- D) All these choices are correct
Correct Answer: A
Explanation
A ground-mounted quarter-wave vertical antenna relies on the earth and ground system beneath it to complete the half-wave dipole equivalent. Since the antenna is fed against the ground, any losses in the ground system contribute directly to the antenna’s total loss resistance (R_{Loss}), reducing its efficiency.
Therefore, the most effective way to improve the efficiency of a ground-mounted quarter-wave vertical antenna is by installing a ground radial system. These low-resistance wires buried or laid on the ground effectively reduce the ground loss resistance, ensuring that a larger percentage of the input RF power is converted into radiated power.
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