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If the freque...

Question

If the frequency of operation of a waveguide is increased above the cut off frequencies, then the guide impedance for TM modes

A

Increases upto one point then decreases

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B

decreases

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C

remains same

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D

Increases

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Solution

The correct option is D Increases
$η_{T M} = η_{0} \sqrt{1 - {(\frac{f_{c}}{f})}^{2}}$

$A s " f " i n c r e a s e s, η_{T M} w i l l i n c r e a s e$

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