Radiation efficiency of an X band waveguide array

This paper investigates the radiation efficiency of an
X
band waveguide array as the number of elements is varied for Uniform, Chebyshev, and Taylor aperture distributions. The radiating elements consist of edge slots machined in the narrow wall of an RG/52U waveguide terminated with a matched load. Efficiency calculations are made for a frequency of 9 GHz and a slot spacing of 0.8 in. Finally, theoretical and experimental radiation efficiencies are compared for a 20-dB Chebyshev array operating at maximum efficiency.