
Find the value of the phase constant, attenuation constant due to the dielectric losses, attenuation constant due to the conduction losses, phase velocity, group velocity and the wavelength of a rectangular waveguide.

Answer to Problem 37P
The value of the phase constant
Explanation of Solution
Calculation:
Given dimensions
Write the expression to calculate the cutoff frequency for
Here,
Write the expression to calculate the phase velocity of uniform plane wave in the lossless dielectric medium.
Here,
Substitute
Substitute
Write the expression to calculate the phase constant of the TE waveguide.
For dielectric medium, the above equation becomes,
Here,
Substitute
Write the expression to calculate the intrinsic impedance of a uniform plane wave in the medium.
Substitute
Write the expression to calculate the attenuation constant due to the dielectric losses.
Substitute
Write the expression to calculate the attenuation constant due to conduction losses for the
Here,
Write the expression to calculate the real part of the intrinsic impedance of the conducting wall.
Substitute
Simplify the above Equation.
Substitute
Write the expression to calculate the phase velocity for the waveguide.
Substitute
Substitute
Write the expression to calculate the group velocity for the waveguide.
Substitute
Substitute
Write the expression to calculate the wavelength of the waveguide.
Substitute
Substitute
Conclusion:
Thus, the value of the phase constant
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Chapter 12 Solutions
Elements of Electromagnetics
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