
47Fundamentals of Wave Propagation
2.19 Transverse Electromagnetic Waves
In view of Equations 2.37 and 2.38 if both E
z
and H
z
are assumed to be absent
all the eld components must vanish. However, Equation 2.44 reveals that
unlike TE wave in case of TM wave H
y
and E
x
do not vanish for m = 0 even if
H
z
becomes zero. Thus, the wave phenomena between parallel planes exist
in spite of the absence of axial (E
z
and H
z
) components. Since the surviving
eld is entirely transverse such a wave is called ‘Transverse Electro Magnetic
(TEM)’ wave. The equations for TEM wave are
H C e
y
j z
=
−
4
β
(2.48a)
E C e
x
j z
=
−
β
ωε
β
4
(2.48b)
In view of Equation 2.48 ...