Study of control of beamwidth of radiation pattern of a waveguide using inclined slotted flanges

The effect of slotted flanges on the radiation pattern of a waveguide is investigated experimentally. The slotted flanges are mounted at the aperture of the waveguide. Both straight and inclined slotted flanges are used. It is seen that considerable changes can be effected in the beamwidth of the pattern by changing the flange inclination. Such a simple control on beamwidth thus makes it possible to use the slotted flange device as a feed to meet a variety of applications.