# Solved Problems-3

Problem-3
For a parallel plane waveguide, infinite in extent and with a spacing of 20 cm between the plates, calculate the
1. phase velocity for TEM mode at all wavelengths
2. cut-off wavelength for dominant TE mode
3. phase velocity for dominant mode at 80% of cut-off wavelength
4. reflection angle for the above frequency of operation
Solution
Here, d = 20 cm

Phase velocity for TEM mode is given as,

Cut-off wavelength for dominant mode is,

Phase velocity for dominant mode at 80% of cut-off wavelength is given as,

Reflection angle is given as,