A rectangular metal wave guide filled with a dielectric material for relative permittivity = 4 has the inside dimensions 3.0 cm X 1.2 cm. The cut-off frequency for the dominant mode is
Forum Expert
The dominant mode is TE20
taking fo = 30 GHz
o = c /fo = 1 cm ( 3 X 10 8
For TE 20 m= 2 =0 c = a =3 cm
= 0/
= 377/
= 400 ohm
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= 4 has the inside dimensions 3.0 cm X 1.2 cm. The cut-off frequency for the dominant mode is
o = c /fo = 1 cm ( 3 X 10 8
=0 
c = a =3 cm
