新型高性能圆极化微带天线的工程研究

【作者】 陈维伟；

【导师】 车文荃；

【作者基本信息】 南京理工大学 ， 信号与信息处理， 2010， 硕士

【摘要】 微带天线以其体积小、重量轻、易共形、制造简单、易集成,以及加工成本低等优点受到广泛的关注。由于移动通信事业的迅猛发展,使得微带天线的双频工作、高增益、宽频带、圆极化和宽波束等技术成为国内外的研究热点。本文对微带天线双频、圆极化、高增益、宽频带和宽波束技术作了一定的研究。分别设计了GSM/DCS双频圆极化微带天线、宽波束圆极化卫星电视接收天线阵和高增益宽频带圆极化微带天线阵。其中GSM/DCS双频圆极化微带天线的圆极化技术,是通过基于复合左右手传输线设计的双频Wilkinson功分器对微带贴片天线馈电实现圆极化；卫星电视接收天线阵宽波束技术是通过微带介质天线技术实现；高增益宽频带卫星电视接收天线阵是通过在Fabry-Perot谐振器反射盖板上加载FSS矩形贴片来实现的。利用电磁仿真软件HFSS分别对上述三种天线仿真,结果表明GSM/DCS双频圆极化微带天线较好地实现了双频和圆极化特性,但带宽窄,方向图恶化。宽波束圆极化卫星电视接收天线阵具有较好的反射特性、轴比特性和较宽的半功率波束宽度,基本满足设计要求,实物样品的测试结果与仿真结果吻合较好。高增益宽频带圆极化微带天线阵的相对阻抗带宽为18.5％,可用频段相对带宽达到9.5％,最大增益达19.3db,而且Fabry-Perot结构不影响轴比特性。更多还原

【Abstract】 The Microstrip Antennas has gained widespread concern for its advantages of small size, light weight, conformal easiness, simple manufacturing, easy integration and low cost. As a result of rapid development of mobile communication, the technologies of dual-band, high gain, broadband, circular polarization and wide-beam have become a hot research topic all over the world.In this paper, technologies of dual-band, circular polarization, high gain, broadband and wide-beam have been studied. A GSM/DCS dual-band circular polarization microstrip antenna, a wide-beam circular polarization antenna array of satellite television receivers and a high-gain broadband circular polarization microstrip antenna array have been respectively designed and investigated. The technology of circular polarization of GSM/DCS dual-band circular polarization microstrip antenna are realized by dual-band Wilkinson power divider which is based on the composite right/left-handed transmission line which functions as the feeding of the microstrip patch antenna. The wide-beam technology for the Satellite TV receiver antenna array is realized through microstrip dielectric antenna technology. The high-gain and broadband performances of Satellite TV receiver antenna array are realized by loading FSS rectangular patch on the reflection cover of Fabry-Perot resonator. HFSS was used to simulate above-mentioned three antennas. The results have indicated that the GSM/DCS dual-band circular polarization microstrip antenna has achieved good circular polarization and demonstrated dual-band characteristics, however, with narrow band and deteriorated pattern. The wide-beam circular polarization satellite TV receiver antenna array has a better reflection characteristic, its axial ratio and the half-power beam width can basically meet the design requirements, agreement can be observed between the measurement results of the prototype and the simulations results. High-gain broadband circular polarization microstrip antenna array has a relative impedance bandwidth of 18.5%, the relative bandwidth of available frequency range achieves 9.5%, and the highest gain is about 19.3db, and the configuration of Fabry-Perot does not affect the axial ratio.更多还原