Question
How does the attenuation of coaxial cable change with increasing frequency?
Answer Options
- A) Attenuation is independent of frequency
- B) Attenuation increases
- C) Attenuation decreases
- D) Attenuation follows Marconi’s Law of Attenuation
Correct Answer: B
Explanation
Attenuation is the power loss in a cable, primarily due to dielectric loss and resistive loss (skin effect). Both of these loss mechanisms become more pronounced as the frequency of the signal increases.
The dielectric loss increases because the alternating electric field causes greater heating in the dielectric material at higher speeds. The resistive loss increases due to the skin effect, which forces the current into a shallower area on the conductor surface. Therefore, the attenuation increases with increasing frequency.
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