Studies on wide inclined slots in the narrow wall of rectangular waveguide

Investigations of the resonant length and admittance of inclined slots in the narrow wall of a rectangular waveguide that are sufficiently wide for applications involving high power handling capacity are presented. For high accuracy, the integrals appearing in the expression for the self-reaction are evaluated numerically instead of attempting to derive closed-form expressions, which are applicable only to thin slots. Numerical data on the variation of resonant length with slot width and also on the variation of real and imaginary parts of the admittance with 2L/λ as well as frequency for wide slots are presented. Comparison between theory and experimental results is presented for a slot with a width of 1.6 mm and a depth of cut in both the broad walls of 2.23 mm