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This paper discusses a type of multimode monopulse feed using corrugated circular waveguide. The 'difference' or error-signals are derived from the TE and/or TM modes, whereas the 'sum' or reference-signal is provided by the so-called hybrid modes. The optimization of the overall tracking performance is carried out in two steps. The horn dimensions are first chosen to give the optimum 'difference' mode illumination, then the 'sum' mode efficiency is optimized by shaping the ' sum ' pattern with the aid of higher-order hybrid modes. It is shown that the performance of a corrugated waveguide monopulse feed is, in many respects, superior to that of its conventional counterpart. [ABSTRACT FROM AUTHOR]

Monopulse feeds which allow an independent optimization of the performance of the sum and difference modes have received much attention in the literature. This paper presents some experimental results obtained with a corrugated feed horn designed to operate at the focus of a paraboloid having =60degrees. The present indication is that a near-optimum performance in both the sum and difference modes can be achieved. [ABSTRACT FROM AUTHOR]