Investigation of the Omnidirectional Dielectric Resonator Antenna for Wireless Communications
DescriptionThe demand for wireless communications has been growing faster than ever, as RF/microwave technology has undoubtedly become a part of our daily lives. In wireless communications, the antenna is very important because it directly affects the signal transmission and reception. Recently, the dielectric resonator antenna (DRA) has been studied extensively due to the inherent merits of its low loss, small size, low cost, and ease of excitation.Studies of the DRA have mainly concentrated on the broadside radiation mode. In some applications, such as indoor wireless communications, the omnidirectional radiation mode is more important because it provides a better coverage. However, much less attention has been received for the omnidirectional DRA. Since today the dualband antenna still plays a very important role in wireless communications (e.g, 2.4/5.2GHz WLAN systems), the dualband omnidirectional DRA will be investigated in this project for the first time. The wideband omnidirectional DRA will also be investigated by merging the two bands of a dualband DRA. Ansoft HFSS will be used to simulate the antennas and measurements will be carried out to verify the results.Thus far, all reported omnidirectional DRAs are linearly polarized (LP), but circular polarization (CP) is more welcome for certain applications including satellite communications because the polarization of a signal may be changed during its propagation. In this project, the CP omnidirectional DRA will also be investigated. A CP polarizer will be integrated with the LP omnidirectional DRA to give a very compact and simple CP design. In this project, the single-/dual-/wide-band omnidirectional CP DRAs will all be investigated. The simulated results will be checked by measurements.The dualfunction omnidirectional DRA that serves as a light cover will be investigated for the first time. The transparent DRA fabricated with glass will be used in this part. By integrating the antenna with the light cover, the installation process can be simplified substantially. The idea will be applied to both the LP and CP DRAs. In the CP case, the transparent indium tin oxide (ITO) film will be used to realize the loading conducting strips, making the whole CP antenna transparent.Since the measured frequency usually deviates from the design value due to manufacturing tolerances, frequency tunings of omnidirectional DRA will be investigated in this project. The result will be of great practical importance.Design guidelines will be provided to facilitate the designs of the omnidirectional DRAs.
|Effective start/end date
|1/08/11 → 24/03/14