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Which of the following are the properties of TEM mode in a lossless medium? 1. Its cut-off frequency is zero. 2. Its transmission line is a hollow waveguide. 3. Its wave impedance is the impedance in a bounded dielectric. 4. Its phase velocity is the velocity of light in an unbounded dielectric. Select the correct answer using the code given below 

Which of the following are the properties of TEM mode in a lossless medium? 1. Its cut-off frequency is zero. 2. Its transmission line is a hollow waveguide. 3. Its wave impedance is the impedance in a bounded dielectric. 4. Its phase velocity is the velocity of light in an unbounded dielectric. Select the correct answer using the code given below  Correct Answer 1, 3 and 4

TEM: Transverse Electric and Magnetic Propagation

In this mode, both electric and magnetic fields are transverse (perpendicular) to the direction of propagation.

For a TEM mode to propagate:

  • Two or more conductors are required and the conductors must have infinite conductivity.
  • Hollow waveguide without center conductor does not support TEM mode.  
  • Uniform isotropic dielectric material and the dielectric must be lossless.
  • The cross-section of the transmission line must remain constant.

 

Properties of TEM mode:

  • It has a zero cut-off frequency, i.e. the minimum frequency that the waveguide can propagate for propagation is zero.
  • Its transmission line is a two-conductor system.
  • Its wave impedance is equal to the intrinsic impedance of the medium. i.e. impedance of the bounded dielectric.
  • Its phase velocity is the velocity of light in an unbounded dielectric

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