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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Extra resources for Corrugated horns for microwave antennas

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72) 44 Cylindrical corrugated waveguides whenxi > 1 Eqn. 73 shows that the attenuation at the balanced-hybrid condition falls as k/(x[)3 which implies a dependence upon rx of r^3 and upon frequency / o f f'2. The resistivity depends u p o n / a s / 1 7 2 leading to an overall frequency dependence of/" 372 . These are the same characteristics as are exhibited by the TEOi mode in a smooth wall waveguide. As mentioned previously, however, the results of exact calculations shown in Fig. 16 show that the HE n mode in a corrugated waveguide has lower attenuation than the TE01 mode in a waveguide of comparable size.

11 shows for the case rl/r0 = 0-6, jJ and A for the four lowest HE l m modes. The influence of the finite period is manifest among the higher order modes where the high-frequency cut-off occurs for a value krx close to that at which j3 is unity. The condition A = 1 occurs close to the frequency at which the corrugation depth is a multiple of X/4. Cylindrical corrugated waveguides 35 Fig. 10 Comparison of wavenumbers and hybrid factor in space harmonic and surface impedance calculations: rx /rQ = 0-8, s/rx = 0-2, t/b = 03 spaed harmonic calculation surface impedance calculation Krx =2-405 HEn HE 12 XHE 13 \ \HE 10 12 Fig.

7. Under this condition the waveguide behaves as if it had a continuous perfectly conducting boundary at r = rx. Pure mode solutions are obtained with or Ez = 0 for TM modes at r = rx —- = 0 for TE modes at r = rx dr The condition is important in the design of the throat of a corrugated horn. The fast-wave to slow-wave transition point 0 = 1 Next, for a fixed value of rjro, as 0 is increased we encounter the fast-wave to slow-wave transition at 0 = 1. When 0 = 1, K = 0 and Fm(x) = ±m. A = - 1 the point marked (3) while A = + 1 the point marked @t From an expansion of eqn.

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