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By P.J.B. Clarricoats

Corrugated horns are generic and hugely effective, particularly of their use as feeds for microwave reflector antennas. This ebook is dedicated to the speculation and layout of corrugated horns and scalar feeds and explains why hybrid mode feeds are excellent feeds for reflectors

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We have seen previously that A equals 0 or °° at cut-off depending on the type of cut-off. In Fig. 7(c), r1/r0 is such that all the HE l m modes shown have E-type cut-off for which A = 0. Then as kr1 increases, A increases to reach the balanced condition A = + 1 before tending to infinity at the 'short-circuit' condition where A = SA = «> a n ( j r 0 — rx ^ A/2. We note that for asymptotically large values of krx, not represented in Figs. 37) Cylindrical corrugated waveguides 29 where q = 0 for HE l m modes and q = 2 for EH i m modes.

17 shows the attenuation for higher order modes in addition to the HE n mode. An extensive programme of measurements made by Clarricoats, Olver and Chong [39], also by Parini [129] have supported the theoretical results presented above. The interested reader is referred to these for further details. 1 Introduction Two methods have been used to determine the radiation pattern of cylindrical corrugated waveguides: the Kirchhoff—Huygen (KH) method and the Fourier Transform (FT) method. For a complete description of the radiated field, both methods require a description of transverse fields over the waveguide aperture, over the waveguide flange and over the remainder of the aperture plane.

The percentage error in using the SI model is seen to be less than 2% in the range 0-5

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