Why Do TEM Waves Exhibit Uniform Field Distribution in the Transverse Plane?

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SUMMARY

TEM (Transverse Electromagnetic) waves exhibit uniform field distribution in the transverse plane due to the consistent radial electric field and azimuthal magnetic field generated by the voltage difference and opposing currents in coaxial cables. These fields adhere to Maxwell's equations and propagate at speeds close to that of light, calculated using the formula v = 1/sqrt(LC), where L represents inductance and C represents capacitance per unit length. The characteristic impedance of the system is defined by Z = sqrt(L/C).

PREREQUISITES
  • Understanding of Maxwell's equations
  • Familiarity with coaxial cable design and function
  • Knowledge of electromagnetic wave propagation
  • Basic concepts of inductance and capacitance
NEXT STEPS
  • Research the implications of Maxwell's equations on electromagnetic wave behavior
  • Study the design principles of coaxial cables
  • Explore the calculation of characteristic impedance in transmission lines
  • Learn about the speed of signal propagation in different media
USEFUL FOR

Electrical engineers, telecommunications professionals, and students studying electromagnetic theory will benefit from this discussion.

oufa
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why does TEM waves have the same distribution of static fields in the transverse plane
 
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The TEM fields of a signal in a coaxial cable at any instant are the same as static fields. There is a radial electric field due to the voltage difference between the conductors, and there is an azimuthal magnetic field between the two conductors due to the opposing electric currents in the two conductors. They obey Maxwell's equations. These signals travel at nearly the speed of light:

v = 1/sqrt(LC) where L and C are the inductance and capacitance per unit length. The ratio of the voltage and current is Z = sqrt(L/C).

Bob S
 

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