Calculators » Coaxial Cable Cutoff Frequency Calculator | RF Design

Coaxial Cable Cutoff Frequency Calculator | RF Design

coaxial cable cutoff frequency RF design microwave engineering

This calculator determines the cutoff frequency of higher order modes in coaxial cables. Below the cutoff frequency, the cable supports only the fundamental TEM mode, ensuring predictable performance.

Inputs

Outputs

EXAMPLE:

  • INPUTS:

    • Outer Conductor diameter in millimeters (D) = 3.5
    • Inner Conductor diameter in millimeters (d) = 1.0
    • Relative Permittivity of Dielectric Medium (Er)= 2.1 (For PTFE substrate)

  • OUTPUT:

    • Coaxial Cable Cutoff Frequency = 29.258 GHz

Coaxial Cable Frequency Formula

Coaxial Cable Cutoff Frequency Formula

Benefits/Applications

  • Assists in cable selection: Choose operating frequencies that avoid unwanted modes.
  • Prevents distortion: Avoids higher order mode propagation that can corrupt signals.
  • Critical in wideband systems: Broadband communications benefit from knowing mode limits.

Summary:

The Coaxial Cable Cutoff Frequency Calculator helps designers determine mode limits, ensuring clean signal propagation and preventing performance degradation in RF systems.