Question

Explain the differences between TE, TM, and TEM waveguide modes and the difference between guided and unguided EM propagation

Answer 1

Wave guide modes: Electromagnetic waves can travel alnog waveguides using a number of different modes

The different waveguide modes:

1) TE MODE:(Transverse electric waves) This mode is depends on transverse electric waves,these waves are also called H waves,these are characterised by the electric vector(E) being always perpendicular to the direction of propagation

2)TM MODE: (Transverse magnetic waves). these waves are also called E Waves. and these are characterised by the magnetic vector (H vector) is always perpendicular to propagation

3)TE MODE: (TRANSVERSE ELECTRO MAGNETIC WAVE ).These waves cannot propagate within a waveguide ,but is included for completeness. These waves are characterised by the both the electric vector(E Vector)
and magnetic vector(H Vector) are perpendicular to the direction of propagation.

Guided EM propagation	un guided EM PROPAGATION
It Requires physical path for transmission	In this the signal is broadcasted through air or water
called wired communication	Called wireless communication
It provides direction for signals	It doesnot provides direction