介质埋藏特型天线的设计与研究

发布时间：2018-05-15 22:28

本文选题：介质埋藏天线 + 介质埋藏平面螺旋天线　；参考：《桂林电子科技大学》2016年硕士论文

【摘要】：一般来说,在实际的应用中,天线无可避免地裸露于空气中受到不同程度的氧化腐蚀而影响天线的性能和使用寿命。基于保护天线或某种特殊性能的需要而开展了介质埋藏天线的研究。本文的主要工作如下:(1)设计了介质埋藏平面螺旋天线,采用渐变的传输线微带巴伦馈电可实现不平衡到平衡的转换和阻抗匹配。在天线背面加反射板,变双向辐射为单向辐射而提高了天线的增益。使用电磁仿真软件HFSS对天线进行大量的仿真实验和优化设计。仿真结果表明:该天线10-SdB11?的相对带宽为139%,在中心频率6GHz处,仿真增益为10.43dB,AdBR?3的相对轴比带宽为75%。制作实物并进行了测试,测试结果表明:该天线10-SdB11?的相对带宽为186%,在中心频率6GHz处,实测增益为9.8dB。在仿真轴比带宽范围内选6个频点进行测试,其轴比都小于3dB,说明天线在这些频点处具有良好的圆极化特性。从整体上看,天线的性能可以被接受的。(2)对介质埋藏平面蝶形天线进行设计,并且在借鉴介质埋藏平面螺旋天线馈电方式的基础上做了一些改进。采用和天线印刷在同一块介质板上的三角形微带巴伦来馈电可在一定程度上降低天线的设计成本和提高天线的集成度。还设计了三角形微带巴伦和微带传输线一起的结构形式,进行阻抗匹配。使用电磁仿真软件HFSS对该天线进行优化设计和仿真实验,与制作的实物天线性能对比。仿真和实测结果表明:该天线11S?-10dB仿真的相对带宽达到88.7%而实测的相对带宽为79.3%,具有超宽带特性。在中心频率3GHz处,仿真增益为6.9dB,实测增益为5.8dB。并且在工作频段内,天线的方向图基本维持相对的稳定。(3)为了进一步探索介质埋藏天线的特性,随后进行两种类型的平面对数周期天线的埋藏研究。一种是平面对数周期偶极子阵列天线,另外一种是齿形对数周期平面天线。其中使用电磁仿真软HFSS对介质埋藏平面对数周期偶极子阵列天线进行优化设计和仿真实验,与制作的实物天线性能对比。仿真和实测结果表明,该天线11S?-10dB仿真的相对带宽达到92.3%而实测的相对带宽为115.3%,具有超宽带特性。在中心频率4.5GHz处,仿真增益为11.5dB,实测增益为10.2dB。天线具有较好的定向辐射特性,并且在工作频段内,天线的方向图维持相对的稳定。对齿形对数周期平面天线进行大量的仿真实验和优化设计。仿真结果表明:该天线10-SdB11?的相对带宽达到38.62%,在中心频率6.5GHz处,增益达到了7.27dB,在6GHz-7GHz内方向图基本维持稳定。所设计天线性能良好,这为以后课题的研究打下一定的基础。最后总结全文的工作,并提出需要完善的工作和进一步研究设想。
[Abstract]:In general, in practical applications, the antenna is inevitably exposed to different degrees of oxidation corrosion in the air, which affects the performance and service life of the antenna. The research of dielectric buried antenna is carried out based on the need of protecting antenna or some special performance. The main work of this paper is as follows: (1) the dielectric buried planar helical antenna is designed. The unbalanced to balanced conversion and impedance matching can be realized by using a gradual transmission line microstrip Barron feed. The antenna gain is improved by changing the bidirectional radiation into one-way radiation by adding a reflector on the back of the antenna. A large number of simulation experiments and optimization design of antenna are carried out by electromagnetic simulation software HFSS. The simulation results show that the antenna 10-SdB11? At the center frequency 6GHz, the relative axis ratio bandwidth of the simulation gain of 10.43dBnAdBR3 is 75. The results show that the antenna 10-SdB11? At the center frequency 6GHz, the measured gain is 9.8 dB. The test results show that the axial ratio of the antenna is less than 3 dB, which shows that the antenna has good circular polarization characteristics at these frequency points. On the whole, the performance of the antenna can be accepted. 2) the dielectric buried plane butterfly antenna is designed, and some improvements are made on the basis of the feed mode of the dielectric buried plane spiral antenna. Using triangular microstrip Barron which is printed on the same dielectric plate to feed the antenna can reduce the design cost and improve the integration of the antenna to a certain extent. The structure of triangular microstrip Barron and microstrip transmission line is also designed for impedance matching. The optimization design and simulation experiment of the antenna are carried out by using the electromagnetic simulation software HFSS, and the performance of the antenna is compared with that of the fabricated antenna. The simulation and experimental results show that the relative bandwidth of the antenna 11S?-10dB simulation is 88.7%, and the measured relative bandwidth is 79.3%. The antenna has ultra-wideband characteristics. At the center frequency 3GHz, the simulation gain is 6.9 dB and the measured gain is 5.8 dB. In order to further explore the characteristics of dielectric buried antennas, two types of planar logarithmic periodic antennas are studied. One is planar logarithmic periodic dipole array antenna, the other is tooth logarithmic periodic plane antenna. The optimization design and simulation experiment of dielectric buried plane logarithmic periodic dipole array antenna are carried out by using electromagnetic simulation soft HFSS, and the performance of the antenna is compared with that of the fabricated antenna. The simulation and experimental results show that the relative bandwidth of the antenna 11S?-10dB simulation is 92.3%, and the measured relative bandwidth is 115.3%. The antenna has ultra-wideband characteristics. At the center frequency 4.5GHz, the simulation gain is 11.5 dB and the measured gain is 10.2 dB. The antenna has good directional radiation characteristics, and the antenna pattern is relatively stable in the working frequency band. A large number of simulation experiments and optimization design are carried out on the toothed logarithmic periodic plane antenna. The simulation results show that the antenna 10-SdB11? The relative bandwidth reaches 38.62 and the gain reaches 7.27dB at the center frequency 6.5GHz, which is basically stable in the 6GHz-7GHz pattern. The designed antenna has good performance, which lays a foundation for future research. Finally, the paper summarizes the work of the paper, and puts forward the need to improve the work and further research ideas.
【学位授予单位】：桂林电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN823

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