| With the increasing development of electronic and information technology, antenna has to satisfythe requirements of miniaturization, multi-band and strong adaptability. The dielectric antenna hasbeen widely sought after as its small size, simple structure, low cost and high efficiency. Based on thetheory of dielectric antenna, some investigation on Dual-Band and High Temperature dielectricantenna has been done.The main contribution and innovation of this dissertation are below.1. Research and design of the Dual-Band dielectric resonator antenna has been done, coveringthe TD-SCDMA and WLAN band. The dual-band dielectric resonator antenna is designed by usingthe multimode resonance characteristics of dielectric resonator. According to electromagneticnumerical computing method，the size of resonator can be estimated through the target frequency,which works in mode HEM111and HEM113. The antenna is fed by double-slit, thus the excitation ofdielectric resonator is done. With the high frequency electromagnetic simulation software AnsoftHFSS, optimization design of feed network of the antenna is fulfilled, Finally, this antenna isfabricated, and perfect agreement between the test and simulation results is obtained, with the antennaworks in band1.7~2.15GHz and2.3~2.48GHz, the return loss is low than-10dB and the half powerbeamwidth (HPBW) is larger than60°. As a result of the unsymmetric feed system, the antenna cannot get a symmetric directional pattern.2. To solve the question of the unsymmetric directional pattern mentioned above, changing thefeed network of the first dual-band antenna, using a single slit to excite the dielectric resonator whichhave the same size with the antenna mentioned previously, the slit lies on the center of the dielectricresonator and can obtain the strongest coupling with the resonator as well as a symmetric directionalpattern, Simulated and optimized by the Commercial software Ansoft HFSS, and then fabricated andmeasured, the improved antenna can work in the band of1.7GHz~2.15GHz and2.3GHz~2.48GHzand has a perfect directional pattern with the HPBW is larger than60°and the gain is precede of6dBi at the frequency of1.8GHz,2GHz and2.4GHz.3. Proposed a new structure of high temperature antenna, with which two high temperatureantennas work in C-band and Ka-band has been designed. The antenna ontology is made by dielectricmaterials. Dislike the traditional high temperature radome antenna, in this paper, the antenna ontologyis buried in thermal insulation material, which is considered as part of the antenna radiation body ofcollaborative simulation. This design can effectively perfect the insulation and seismic performance ofthe antenna. In order to obtain effective radiation under high temperature, the final antenna radiating surface must be near the top of the insulating layer. The C-band antenna utilizes a dielectircwaveguide to feed the rectangular resonator, while the Ka-band antenna adopts dielectric rod antenna,with its strong directivity, to feed the cylindrical dielectric resonator over the rod antenna by means ofspace coupling. Simulation is done by using HFSS, the antenna is designed and fabricated, a test ofthe antenna under normal and high temperature environment is accomplished. Results show that bothof the antenna has a broad beam and robust resistance to high temperature，the antennas have a goodperformance in the condition of more than1000degrees for a long time. |
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