Scattering properties of broad wall slots in rectangular waveguide

Summary form only given. R.S. Elliott´s contributions to the understanding of the scattering properties of broad wall slots in rectangular waveguides are discussed. Their significance in the analysis and synthesis of slot arrays is also discussed. Elliott´s design procedure for a linear or planar array requires input data for the resonant length and the normalized slot admittance. The resonant length data were previously obtained from carefully performed experimental measurements. It was noted that Khac´s moment method model did not predict the resonant length accurately since the design of a high-performance antenna requires resonant length data within a fraction of one percent accuracy. Such a requirement was fulfilled by Stern and Elliott with an accurate moment method model for a longitudinal slot. It was also shown that the shunt model and a half-cosine equiphase distribution for the aperture field were poor under certain conditions. Significant contributions of Elliott and others have led to the design of slot arrays without the need for taking experimental data.<>