Abstract
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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{01 \delta }$ </tex-math></inline-formula> 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.
Highlights
Because of low loss and ease of excitation, the dielectric resonator antenna (DRA) [1]–[3] has been widely studied in the past three decades
The number of the glass DRA units are chosen as N = 3 and their impedance bandwidths are chosen as 34 %, 55 % and 70 %, respectively
The antenna configuration consists of a probe platform and a solid cylindrical glass DRA unit
Summary
Because of low loss and ease of excitation, the dielectric resonator antenna (DRA) [1]–[3] has been widely studied in the past three decades. Different kinds of materials can be used to fabricate a DRA, such as composite material, ceramics, and K9-glass. Much work on the glass DRA has been reported, such as lens DRA [4], mirror DRA [5], socket DRA [6], light cover-DRA [7], [8] and artistic DRA [9], [10]. The radiation of DRA can be mainly divided into two types: directional and omnidirectional. The omnidirectional DRA [11]–[13] is preferable to the directional one because it can cover a larger area. The impedance bandwidth of the fundamental TM mode of a solid DRA is less than 15% (εr = 6.85) [13]
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