Coaxial Cable and Connector Cutoff Frequency Calculator (TE11)
Highest frequency before the first higher-order mode appears in a coaxial line or connector, from its dimensions.
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fc ≈ c / (π · √εr · (D + d) / 2) for the first higher-order mode (TE11). Usable frequency must stay below it; real connectors and cables are rated lower by their manufacturer — use the datasheet value. Z₀ = 60/√εr · ln(D/d).
For preliminary assessment only — the final decision must follow the manufacturer’s datasheet and the applicable NEC / IEC / UL standards. Results are calculated from the standard formulas stated on this page and are for design estimates only. They are not a rating of any specific part — always confirm current, voltage, temperature and environment limits against the manufacturer’s datasheet for the part you intend to use.
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