A rectangular waveguide is a rectangular metal waveguide capable of supporting waves propagating along it. The peculiarity of the waveguide is that there is a lower limit of the transmitted frequencies in it, that is, waves below a certain frequency attenuate and cannot propagate in it.
Rectangular Waveguide
The main advantages of a rectangular waveguide are:
- sufficiently high power of the transmitted signal;
- almost complete absence of radiation losses of energy into the environment.
Frequency Pass Limit
Different types of waves can exist in a rectangular waveguide, most often H 10 type waves are used (which means one maximum on the wide wall of the waveguide and none on the narrow one). Let a be the width of a rectangular waveguide.
The minimum frequency of the H 10 wave, capable of propagating in the waveguide, is equal to: where - the speed of light in the waveguide.