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← ScienceWhich outcome occurs when a dielectric fills a waveguide operating near cutoff?
A)Impedance matching is greatly improved
B)Evanescent mode propagation is reduced✓
C)Group velocity of waves increases
D)Power handling capability decreases significantly
💡 Explanation
Evanescent mode propagation reduces because introducing the dielectric increases capacitance; the cutoff frequency decreases due to changed permittivity via dielectric polarization. Therefore, fewer frequencies propagate evanescently, rather than other impedence or velocity changes, which result from different factors.
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