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This paper presents the design, development and simulation results of a C-band profiled corrugated feed horn. The corrugations are radially cut in the horn surface. Ring-loaded mode converters are used for significant reduction in feed aperture and desirable increase in bandwidth thereby giving many advantages in overall reflector systems. The horn flare is profiled so that the inner surface of horn is having a curvilinear flare. This approach has led to significant reduction in overall size of the feed. Stow height of VSAT systems is reduced and the blockage area by the feed in dual reflector systems is decreased as well. Though the feed is designed to work in the SATCOM operating frequency range i.e. from 3.4 to 6.725 GHz, but the feed results are better beyond these frequencies. The return loss over the band (3.4–8 GHz) is greater than 20 dB. On axis cross-polarization levels are better than 55 dB (3.4–7 GHz).Furthermore, radiation pattern symmetricity is maintained in orthogonal planes. This feed horn finds application in VSAT, Earth station antennas and SOTM (Satcom on the Move) systems. [ABSTRACT FROM AUTHOR]

In this work, the design of a convex conformal reflectarray (CRA), suitable to be used for high gain on board antenna in mobile communication systems, is presented. The reflector is not planar, as in usual reflectarray configurations, but the re-radiating elements are printed on a surface conformed to a cylinder to mimic a curved surface, such as the fuselage of an airplane, on which the reflectarray could be mounted. To compensate for the loss in efficiency due to the curvature, an ad hoc feed is designed; the results obtained with the simulation of the entire structure and the measurements of its prototype prove the effectiveness of the design procedure and its capability in enhancing the CRA features, in comparison with similar but more conventional solutions. [ABSTRACT FROM AUTHOR]