Coaxial Cable Cutoff Frequency Calculator

What is the cutoff frequency of coaxial cable?

When the coaxial cable is used above the cut-off frequency, the interference of (TEM) mode will occur because of the creation of new frequency modes such as transverse-magnetic (TM) or transverse-electric (TE) propagation modes, and these modes travel at a different velocity than the TEM mode. This situation will create reflections and interference to the TEM mode signals that travel through the coaxial cable. Hence, a signal should have a frequency lower than the cut-off frequency of cable to ensure interference-free signal propagation. 

The cut-off frequency of the coaxial cable is roughly inversely proportional to the outer diameter of the cable.

The coaxial cable is designed for carrying the TEM (Transversal Electric and Magnetic Field) mode signal. It consists of an inner conductor (carrying electric signal) made of copper or copper-plated steel and an outer conductor (ground conductor) made of the woven metallic braid with dielectric material between them and covered by outer insulation (jacket). The cut-off frequency of the coaxial cable represents the maximum upper operating frequency of the cable (i.e., a signal that propagates through the cable should have a frequency lower than the cut-off frequency of the cable to ensure interference-free signal propagation).