Abstract
This study investigates the effect of loading a monopole-fed cylindrical ring dielectric resonator antenna using a metallic cap and metallic sleeve on its top and outer surface, respectively. The proposed design exhibits a considerable shift of its upper cut-off frequency (from 13.8 to 20.5 GHz for top loading and 8.2 to 15.9 GHz for outer-surface loading) with varying inner radii (height) of the metallic cap (sleeve), thereby providing the bandwidth (BW) controllability. Fabricated prototypes were measured and compared with simulations and good agreement was obtained. The measured return loss exhibits the desired BW control without affecting the peak gain and radiation pattern of the antenna, which is also confirmed by the measured radiation patterns. The proposed concept can be used to reconfigure the BW of the antenna according to the user's requirements and improve signal-to-noise ratio by rejecting unwanted frequency bands without employing any additional filter section.
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