Discussion
What is a TEM horn?
Answer: A
A TEM horn is formed from two flaring conductors, so the guided wave has no cutoff and the structure works from very low frequencies upward, which suits impulse radar and time domain measurement. Its aperture field is neither uniform nor free of dispersion, and no waveguide mode propagates to zero frequency, which is exactly why a two conductor structure is needed. The name refers to the mode it guides and has nothing to do with microscopy.
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