Summary
International Symposium on Antennas and Propagation
2008
Session Number:4IS06a
Session:
Number:4IS06a-2
Compact Dual-Band Dielectric Resonator Antenna
Yang-Kai Wang, Yi-Fang Lin, Chia-Ming Liang, Hua-Ming Chen,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
The dielectric resonator antenna (DRA) [1, 2] has been of interest due to their low loss, high permittivity, light weight and ease of excitation. In addition, wide bandwidth, low dissipation loss at high frequency, and high radiation efficiency due to the absence of conductors and surface wave losses are inherent advantages of DRAs. In the past few years, theoretic and experimental investigations have been reported by many researchers on DRAs of cylindrical, rectangular, and hemispherical shapes [1-15]. The use of dielectric resonators in feeding circuits requires accurate knowledge of the coupling between the resonator and circuits. In order to match the DR to the feed line and to excite the desired mode in the resonator, the most common method of feeding techniques is aperture-coupled arrangement [3-5]. Recently, hybrid dielectric resonator antennas have attracted extensive attentions due to their dual-band and wideband operation without increasing antenna volume. The hybrid structure can be considered as the combination of a DRA and another radiating resonator of the resonant feeding structure. These two radiating resonators are tightly stacked together and resonate at different frequencies. By arranging for the radiating resonators’ position, a compact dual-band [6-9], wideband [10-13] or frequency tunable [14, 15] hybrid DRA can be designed. However, the resonant feeding structure adopted in these reported designs such as microstrip-fed aperture-coupled, loop slot or CPW-fed slot arrangement offer more flexibility and is directly compatible with different mounting surfaces. In this letter, in order to avoid via holes and for ease of fabrication, the microstrip line feed to DRA is adopted as shown in Fig. 1. The DRA is operated in its fundamental HEM11 mode, and it is used as the parasitic c-slot feeding structure at the same time. It will be fond that by varying the size of the parasitic c-slot, the operating frequency of the slot mode can be adjusted easily. This design has the advantage of simple structure, compact size and can achieve dual-band with different radiating patterns. These proposed DRA is suitable to be mounted above the system circuit board of the mobile communication device, and are very suitable for application in mobile communication systems.