By P.J.B. Clarricoats
Corrugated horns are known and hugely effective, particularly of their use as feeds for microwave reflector antennas. This booklet is dedicated to the idea and layout of corrugated horns and scalar feeds and explains why hybrid mode feeds are perfect feeds for reflectors
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Extra info for Corrugated horns for microwave antennas
Thus the degeneracy conditions occurs for high-order modes when the corrugation depth is approximately \ / 2 . When designing corrugated horns, especially those with narrow flare angle, we are interested in the way the special conditions vary with the normalised corrugation depth (r0 —r^/X as krt varies. This information is plotted in Fig. 6. Cylindrical corrugated waveguides 27 The balanced-hybrid conditions Sm(x[t x'Q) = 0 When the surface admittance Y = 0, Sm (x[f x'o) = 0 and we have from eqn.
However, in contrast with the radiation characteristics of a corrugated waveguide, inclusion of space harmonics is vital to an accurate result for attenuation. The space harmonic formulation has been developed by us and is given in Reference 39. In this section our numerical results will draw on that theory. We begin by deriving an expression for the Poynting vector Sz for m = 1 modes. 63) For the m = 1 modes, we have on substitution from eqns. 62, a ? 64) Eqn. 64 shows incidentally that when A = ± l the energy distribution is circularly symmetric.
26) from those of eqn. 26 in ways we shall discuss but many general features of the exact solutions of Fig. 3 are the same. The sketches of Fig. 4, which correspond to different values of rtlr0, and Figs. 7, help us to identify these features as follows. The cut-off condition Q = 0 In eqn. 28) Eqn. 29) then Hz is finite and Ez = 0. The cut-off is therefore an //-type and in the limit as tends to be zero, the mode exhibits pure TE properties with A tending to infinity. 26 Cylindrical corrugated waveguides Eqn.