![]() ![]() To be sure that only one mode propagates, thus keeping the signal clean, you will need to stay below f c. ![]() Higher modes will be excited at small imperfections, bends, etc., but below cutoff they rapidly disappear along straight sections of coax. Higher-order mode that will screw up your loss and VSWR and as they have different propagation velocity than the TEM mode and will interfere with it. What is meant by the cutoff frequency f c? The desirable TEM mode is allowed to propagate at all frequencies, but at frequencies above f c the first higher-order mode called TE11 is also allowed to propagate. This page was split off from our coax page. ![]() Click here to go to our main page on coax ![]()
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