Radiation characteristics of radial waveguide fed slot arrays of various shapes

It is demonstrated that the slot shapes could be made a parameter in order to achieve a desired radiation pattern. Results are presented showing an alternate form of a radial waveguide fed array producing radiation in the axial direction. With photo etching techniques, arrays of crescents (or any shape) can easily be formed. Owing to the simplified feed, an array of crescents will be simple and less expensive to operate in comparison with an array of uniform thickness with TM(01) excitation.