Abstract
This paper presents low-loss dielectric loading techniques for improving some of the radiation characteristics of H-plane horn antennas. Specifically, the paper reports experimental results over new horns loaded with dielectric in the transverse and longitudinal planes with and without air gaps between the dielectric layers or between the dielectric and metallic walls. Sample results are presented showing improvements in the beam width, axial gain, input voltage standing wave ratio (VSWR) at the expense of new or increased side lobe level at some frequencies within the passband. Results are also presented to show that the main beam of a novel dielectric-loaded horn can almost be scanned from one wall of the horn to the other in synchronism with frequency sweep within the passband. Finally, a line-of-sight portable communication device employing the characteristics of dielectric-loaded horn antennas is proposed for further research and development.
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