By P.J.B. Clarricoats
Corrugated horns are normal and hugely effective, particularly of their use as feeds for microwave reflector antennas. This e-book 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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Extra resources for Corrugated horns for microwave antennas
17) For convenience, we drop the z dependence, and write eqns. 19) tne where y0 = (eo/juo) free-space wave admittance. A is the so-called normalised hybrid factor, a most important quantity in determining the crosspolar radiation characteristics of feeds. From Maxwell's equations we can express the $ components of the electric and magnetic fields. 23) r(4r m ( *' X o ) m\xo) = kv$ As there are no TE standing waves in the slot EQ — 0 at r = r l 5 thus, from eqn. 25) Eqn. 26 is just a special case of the general characteristic equation (29 in the Appendix).
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. 30) then Ez is finite and E2 = 0. The cut-off is therefore an E-type in the limit as 0 tends to zero, the mode exhibits pure TM properties with A tending to zero. Notice that for H-mode cut-off the boundary condition corresponds to that of a TE mode in a uniform waveguide of radius rx while for #-mode cut-off the boundary condition corresponds to that of a TM mode in a uniform waveguide of radius r0.
Multimode feeds can be designed using smoothwall waveguide but in general their features are similar to those of multimode | z=0 (i) side view (»i) end view schematic diagram of waveguide junction geometry Channel Aperture Distribution Constituent modes HE,, azimuthal difference elevation difference HE 2 1 Fig. 24 Corrugated monopulse feed and monopulse mode patterns corrugated feeds, with one exception. The exception is the so-called Potter horn , where a hybrid field is synthesised by the excitation of a T E n and TM n mode in correct amplitude and phase.