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How does the attenuation of coaxial cable change as the frequency increases?

Attenuation increases with frequency.

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  1. It is independent of frequency
  2. Attenuation decreases
  3. Attenuation increases ✔

Why: Coax loses more signal as frequency goes up. The same cable wastes more power at higher frequencies.

Huh, didn't know that: High SWR increases loss in a lossy transmission line.

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References

Answer: Attenuation increases. Coax loses more signal as frequency goes up. The same cable wastes more power at higher frequencies.

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    B. Attenuation increases
    Checked 2026-10-11.
  2. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    High SWR increases loss in a lossy transmission line
    Checked 2026-10-11.

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