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Microwave Communication

Q1: The cut off wavelength in circular waveguide

A guide diameter

B square of guide diameter

C cube of guide diameter

D square root of guide diameter

ANS:A - guide diameter

Some applications require dual polarization capability. Circular waveguide has this capability. These analysis uses cylindrical coordinates. In circular waveguide TE11 mode has the lowest cut off frequency and is the dominant mode. If D is diameter of waveguide λc = 1.706 D for TE11 mode λc = 1.029 D for TE21 mode λc = 0.82 D for TE01 mode λc = 1.306 D for TM01 mode.



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