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Which is the dominant for a circular waveguide?

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Which is the dominant for a circular waveguide?

(a) TE 01

(b) TM 01

(c) TE 11

(d) TM 11

The question was posed to me at a job interview.

My question is based upon Practicality of Antenna in portion Modulation of Analog Communications

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The correct choice is (c) TE 11

Explanation: Circular Waveguide supports TM and TE mode, which stands for Transverse Magnetic waves and Transverse Electric waves respectively, but it does not support TEM, Transverse Electromagnetic waves, mode. A rectangular waveguide can’t propagate below some certain frequency. The dominant mode for it is TE 11 mode.

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