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Which is the dominant mode for a rectangular waveguide?

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Which is the dominant mode for a rectangular waveguide?

(a) TE 01

(b) TM 01

(c) TE 10

(d) TM 10

I got this question in an interview for internship.

Question is taken from Reactance Modulator in section Angle Modulation of Analog Communications

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Right option is (c) TE 10

The explanation is: Rectangular waveguides are the earliest form of transmission lines. It 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 10 mode.

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