An evanescent mode occurs when:

An evanescent mode occurs when: 

a. A wave is attenuated rather than propagated. b. The propagation constant is purely imaginary. c. m = 0 = n so that all field components vanish. d. The wave frequency is the same as the cutoff frequency. 
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1 Answer

Answer :

An evanescent mode occurs when: A wave is attenuated rather than propagated.

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