Wideband and Bandwidth-Controllable Hybrid-Cylindrical Glass Dielectric Resonator Antenna for Indoor Communication

In this paper, a wideband and bandwidth-controllable hybrid-glass dielectric resonator antenna (DRA) excited by a probe platform is proposed. The proposed hybrid-glass DRA simply consists of a probe platform and a solid cylindrical glass DRA unit, making the fabrication easier. The probe mode and the TM
$_{01 \delta }$
mode of the cylindrical glass DRA are employed to design the wideband antenna. It is found that the impedance bandwidth of this hybrid-DRA can be controlled by the height of the glass DRA in a wide range of ~23%-70%, without changing the size of the feeding. Engineering formula considering the bandwidth has been given to facilitate the design. To demonstrate the idea, three wideband hybrid-glass DRAs with their measured impedance bandwidths of 39.5%, 56.6% and 74% have been designed. To upgrade the three hybrid-glass DRAs as the artistic antennas, laser-engraving patterned glass is employed to do the fabrication again. The measured results show that the performance of the hybrid-glass DRAs with and without patterns are basically the same.