| Recently, the crowding of spectrum brought in by the rapid development of wireless communication demands the appearance of new spectrum utilization. Meanwhile, media communication requires higher data rates and better quality of service in complex fading channel. Fortunately, the emerging ultra-wideband (UWB) technique is a promising candidate to meet the requirement. The UWB antenna, as a crucial device in UWB wireless system, attracts much attention for its great potential in engineering. Furthermore, the minimization and integration of the UWB antenna becomes an orientation. Therefore, we discuss the bandwidth enhancement of a special kind of antenna.The dielectric resonator antenna (DRA) becomes an effective solution due to its inherent merits of low loss, small size, lightweight, low cost, and ease of excitation. The wideband improvement is easier for DRA comparing to microstrip antenna (MSA). In addition, the high degree of flexibility and versatility allows for designs to suit a wide range of physical or electrical requirements of varied communication applications. Accordingly, DRAs come into our sight to be the special antenna.The major job of this dissertation is to discuss the bandwidth enhancement of DRAs, as well as investigate the hybrid dielectric resonator antenna with UWB performance. Firstly, we illustrate several methods and structures for improving bandwidth, including modifying the fed mechanism, using parasitic strips and short pins, employing stair-shaped dielectric structure or multi-layer dielectric structure. Then the hybrid monopole combined dielectric structure is used to design the UWB antenna. The details of analysis and simulated results are presented to show the good performance. At last, the modified hybrid DRA is investigated for reducing the antenna configuration and at the same time maintaining the UWB performance. |
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