【作者】 尤伟；

【导师】 郭辉萍；

【作者基本信息】 苏州大学 ， 通信与信息系统， 2010， 硕士

【摘要】 由于微带天线具有很多诱人的特性,比如体积小、重量轻、易加工等。然而,普通的微带天线有一些诸如窄带宽和低效率的主要缺点。在详细研究天线展宽频带和提高增益的原理和实现手段的基础上,本文重点对双层弧形缝隙微带天线、L型探针馈电的开缝微带天线、宽带EBG结构及介质谐振器天线进行了研究分析,在此基础上提出了三款宽频带高增益的天线,并对其中的两款进行了加工,测试结果表明这些天线都有良好的带宽、增益和方向图。论文共分为五个部分。首先,论文说明了研究宽频带高增益天线的意义和现状,并介绍了所使用的数值计算方法以及三维仿真软件。其次,提出了一款新型的带有弧形缝隙的微带天线,这款天线主要用来拓展微带天线的带宽。然后,这款天线与双层结构相结合,成为一款宽带高增益的微带天线。通过仿真软件仿真、优化设计了一款普通的微带天线,用来与本文所提出的天线做比较。测试结果表明:本文所设计的双层天线,具有较宽的带宽和较高的增益。接着,论文采用L型探针馈电,使用空气填充介质的贴片结构以及贴片开缝等技术,设计了一款小面积、宽带、高增益、结构紧凑的天线。测试结果表明,这款天线可以达到27.3%的带宽(中心频率为2.6 GHz ),最大增益可达8.4 dB。然后,论文分析了电磁带隙结构的等效电路,研究了展宽电磁带隙的方法,提出了一种宽带电磁带隙(EBG)结构,并将这种结构用于提高介质谐振器天线的增益。仿真结果表明,这种宽带EBG结构使介质谐振器天线的增益在180MHz的频带范围内高于8dB,比文献[53]中的环形EBG结构具有更好的效果。最后,论文总结了全部工作,并对未来相关研究工作做了展望。更多还原

【Abstract】 There is considerable interest in the use of microstrip antennas because of its many attractive features, such as low profile, light weight, easy manufacture. However, classical microstrip antenna has major drawbacks such as narrow bandwidth and low efficiency. On the basis of analysis of broadband antennas and high-gain antennas, this thesis focuses on the analysis of a stacked curved slotted microstrip antenna, a L-probe fed slotted microstrip antenna, broadband EBG structures and dielectric resonator antennas. Three kinds of broadband and high gain antennas are proposed, two of which are fabricated and measured. The test results show that these antennas have good characteristics of bandwidth, gain, and radiation pattern.This thesis is divided into five parts. First of all, the paper introduces the significance and status of broadband and high gain antennas, and discusses the used numerical calculus method and 3D simulation software.Secondly, a new kind of microstrip antenna with curved slots which is used to broaden the bandwidth is proposed. Then, this antenna is combined with a two-layer structure, becoming a broadband high-gain microstrip antenna. By using the 3D numerical simulation software, an ordinary rectangular microstrip patch antenna is simulated, optimized and compared with the proposed one. This antenna is fabricated and measured. The measured results indicate that the stacked antenna has a wider bandwidth and higher gain than an ordinary one.Thirdly, a kind of L-probe fed slotted microstrip patch antenna is analyzed. The design adopts contemporary techniques: L-probe feeding, patch structure with air-filled dielectric, and slotted patch. The composite effect of integrating these techniques and by using the slotted patch, offer a low profile, broadband, high gain, and compact antenna element. Simulated results indicate that a 27.3% fractional impedance bandwidth is achieved with respect to the centre frequency of 2.6 GHz and the maximum achievable gain is 8.4 dB. Next, The equivalent circuit model for electromagnetic band-gap structure is analyzed, and also the methods of broadening the bandwidth of band-gap are studied. A broadband EBG structure is proposed and used to increase the gain of a dielectric resonator antenna. The simulation results show that this kind of broadband EBG structure increases the gain of the dielectric resonator antenna up to 8dB in a frequency range of 180MHz,which is better than the circular EBG structure proposed in [53].Finally, the thesis summarizes the entire work and the future prospect of the relevant research work.更多还原