Question
Which of the following increases the resonant frequency of a dipole antenna?
Answer Options
- A) Lengthening it
- B) Inserting coils in series with radiating wires
- C) Shortening it
- D) Adding capacitive loading to the ends of the radiating wires
Correct Answer: C
Explanation
A dipole antenna is resonant at a specific frequency when its total electrical length is equal to a half-wavelength. The relationship between frequency and wavelength is inverse: as frequency goes up, wavelength gets shorter (T3B05).
Therefore, to increase the resonant frequency (make the wavelength shorter), you must shorten the antenna. Conversely, lengthening the antenna lowers the resonant frequency. Inductive coils are used to ‘electrically lengthen’ an antenna (T9A02), which lowers the resonant frequency.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!