Corrugated horns for microwave antennas by P.J.B. Clarricoats

By P.J.B. Clarricoats

Corrugated horns are standard and hugely effective, specifically 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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68) 2PTb s 10-* VY : \V \ V \\ \ CD c o a 1 0" 10" 3 \ " " " " - ^ \ TEn(R s ro) . _ i t 1 J 6 radius r<],cm —1 - 1 — 10 Fig. 16 Comparison of HEXI mode attenuation as a function of radius in brass corrugated waveguide and TEn mode and TE01 mode in brass smooth-wall waveguide. Frequency = 9 GHz. sA = 0 25. b/K = 0 3. 69) and JPLI *S t n e power lost respectively on the side-walls and base of the corrugations, o is the slot width and the ridge thickness is assumed negligible. 70) 03 C o 001 0001 tur-j/c Fig.

The two conditions occur at nearly the same frequency when fi -* 1 which it does for a large aperture waveguide in the SI modes. 38 Cylindrical corrugated waveguides Fig. 13 Transverse electric-field patterns of HEn mode at various frequencies above cut-off a fifc = 1 0 b flfc = 1 "23 c flfc = 1 -89 d f/fc = 242 e f/f = 2 8 0 Cylindrical corrugated waveguides 39 We know from our prior discussion that space-harmonics are required for an accurate representation of the fields in a periodic waveguide.

First it is necessary to represent the boundary, we have two options, we can assume a uniform surface impedance for the wall or we can solve exactly the boundary-value problem. Then the field in the interior of the waveguide is represented by a space-harmonic series and the field within each corrugation by an infinite set of resonant modes. The first method is simple and quite accurate, however, when the waveguide radius is of order one wavelength, space harmonics must be included if an accurate crosspolar pattern is to be obtained.

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