On the design of a circularly polarized waveguide narrow wall linear array

The design characteristics of a circularly polarized linear array are presented. The array elements are crossed slot radiators on the narrow wall of a T-septated waveguide that supports Odd and even symmetry modes. These modes have the same phase velocities, if the dual mode waveguide is properly dimensioned, and they excite independently the shunt and series portions of the crossed slot element. Based on theoretical and empirical design criteria, a linear array of such elements was constructed and tested and the results proved very satisfactory.