The waveguide can be considered as

This question was previously asked in

BSNL JE (TTA) 26 September 2016 Shift 1 Paper

- high pass filter
- low pass filter
- band pass filter
- none of these

Option 1 : high pass filter

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BSNL JE (TTA) 25 September 2016 Shift 1 Paper

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180 Mins

Waveguides only allow frequencies above cut-off frequency and do not pass below the cut-off frequencies.

Hence it acts as a high pass filter.

The cut off frequency is given as:

\({{\rm{\lambda }}_{\rm{C}}} = \frac{2}{{\sqrt {{{\left( {\frac{{\rm{m}}}{{\rm{a}}}} \right)}^2} + {{\left( {\frac{{\rm{n}}}{{\rm{b}}}} \right)}^2}} }}\)

Where a and b are the dimensions of the waveguide (a>b)

m and n are mode numbers TE
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