OZ2OE Technical Home Page - 10 GHz waveguide slot antenna. 1999 Design of a 10 GHz beacon antenna. A standard WG16 waveguide is used. A vertical slot gives a horizontal polarisation. With many slots in a waveguide the antenna works like a stacked array of dipoles.
More slots means more gain.
The mechanical tolerances are more and more important when the frequency increases. On 10 GHz the wavelength is 30 mm, so an error of 1 mm is equivalent to a phase error of 12 deg. This is too much for a phased array, and all mechanical dimensions should thefore be accurate to less than 0.5 mm. The waveguide between the two sections must be more than 1 wavelength long to ensure a well behaved field before the radiating section. Drawing af coax to waveguide transition.