Abstract
A wideband hybrid dielectric resonator antenna (DRA) consisting of a rectangular slot patch and a perforated stacked cylindrical dielectric resonator (DR) is proposed. A rectangular slot was etched on the grounding side of a microwave laminate (ϵ s = 3.38) to excite the hybrid resonator at a high frequency. The stacked DR used consists of three different layers of permittivity, in which air-cavity was introduced internally to form a perforated structure. With a proper stacking arrangement of the perforated DRs on top of the rectangular slot, their operating frequencies were merged together to produce a wideband hybrid DRA. It was found that the combination of the stacked DR with perforated structure in the hybrid element had yielded an impedance bandwidth of as wide as 75.8% (12.2 GHz - 27.1 GHz). Huge improvement in bandwidth was successfully achieved in this study in comparison to that without a perforated structure of only 48.9%. Simulation of the antenna was performed in time domain using Computer Simulation Technology (CST) and was subsequently verified with the measurement results. The average simulated and measured directivity of the antenna were recorded to be 6.05 dBi and 5.65 dBi, respectively, with a stable broadside radiation throughout the operating range of frequency. The radiation characteristics were seen to be broadside in both the E-plane and H-plane.
Highlights
Dielectric resonator antenna (DRA) had been developed and introduced by Long et al [1]
DRA is receiving an extensive attention owing to its intrinsic advantages
This includes an optimization on stacked dielectric resonator (DR) configuration with different dielectric substrates incorporation as well as the perforated structure
Summary
Dielectric resonator antenna (DRA) had been developed and introduced by Long et al [1]. Through the use of a perforated rectangular DRA integrating with radiating probe feeder Another proposed technique to broaden the bandwidth of an antenna represents the use of hybrid structure which can be considered as the combination of two different radiating resonator elements [10]–[18]. As of today, there is still a lack of significant studies conducted on the wideband characteristic of a hybrid antenna This includes an optimization on stacked DR configuration with different dielectric substrates incorporation as well as the perforated structure. The impedance bandwidth of the antenna was further improved by perforating the stacked DRs. By performing a comprehensive parametric analysis on different parameters, the resonances obtained from the three stacked layers and the slot were merged together.
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