What is the general property that determines the resonant frequency of an antenna?

Question

31-03-2025
Physics

High School

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What is the general property that determines the resonant frequency of an antenna?

Answer :

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akansha08 akansha08 · Answer 1 · 2024-04-24T11:44:30-04:00

Final answer:

The resonant frequency of an antenna is mainly determined by its physical length as it relates to the wavelength of the electromagnetic waves. A quarter-wave antenna resonates at a frequency where the antenna length is a quarter of the wavelength, analogous to a closed air column's fundamental resonant mode.

Explanation:

The general property that determines the resonant frequency of an antenna is primarily its physical dimensions about the wavelength of the radiated electromagnetic waves. The simplest resonant antenna is a half-wave antenna, where the total length of the antenna is half the free space wavelength (λ). A quarter-wave antenna, where the antenna is 1/4 the wavelength of the frequency it resonates at, can be analogous to the fundamental resonant mode of an air column closed at one end, such as the analogy used to explain wave phenomena in physics. So, in essence, the length of the antenna with the wavelength of the signal to be received is what determines the resonant frequency. When tuning radios or TVs, we adjust electrical properties to achieve the resonant condition needed for clear reception at the desired frequency.