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Characteristics of TE and TM Waves

The transverse electric and magnetic waves for parallel conducting planes exhibit some interesting properties as compared to those for uniform plane waves propagating though free space.

From the summary of the different field components for TE and TM waves, it is seen that for each of the components of Description: 27334.png or Description: 30387.png, there is a sinusoidal or cosinusoidal standing-wave distribution across the guide in the x-direction. This means that each of these components varies in magnitude, but not in phase, in the x-direction. In the y-direction, by assumption, there is no variation of either magnitude or phase of any of the field components.

Thus, any xy-plane is an equiphase plane for each of the field components. These equiphase surfaces propagate along the guide in the z-direction.

We find the following quantities for the TE and TM mode waves for parallel plane waveguide.
  1. Propagation constant (γ)
  2. Cut-off frequency (fc) and cut-off wavelength (λc)
  3. Guide wavelength (λ)
  4. Velocities of wave propagation
  5. Wave impedance (η)
Characteristics of TEM Waves
We determine the following for TEM waves:
  • Propagation constant (γ)
  • Intrinsic impedance (η)
  • Cut-off wavelength (λc)
  • Velocity of wave propagation

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