基于漏波波导的L波段高功率微波天线设计

发布时间：2018-03-12 18:31

本文选题：高功率微波　切入点：漏波天线　出处：《国防科学技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着高功率微波(High Power Microwave,HPM)技术向实用化发展,研制结构紧凑、轻便、环境适应性强的发射天线成为应用HPM技术的迫切需求。针对L波段高功率微波辐射既要满足高功率容量、又要在较小的尺寸内实现高效率辐射的特殊需求,本文重点研究了一种漏波波导的强耦合设计方法,并设计了长度相对较短的L波段漏波波导天线,所设计的漏波波导天线具有功率容量高、便于组阵等特点。主要内容包括:1.漏波波导辐射特性研究根据漏波波导的等效电路,采用传输线理论和微扰法,得到了具有较高近似阶数的传播常数和衰减常数的表达式。在弱耦合辐射、强耦合辐射以及具有介质板天线罩三种情况下,对比分析了数值模拟结果与理论值的差异,提出了修正理论计算不足的方法。2.天线设计和优化利用数值模拟、理论分析等方法设计了单根L波段漏波波导天线,经过优化,仿真结果与理论设计一致。所设计的天线总长度约2.2 m;辐射效率95.7%,端口反射系数-33 dB;主瓣方向与波导轴向夹角42o,增益15.8 dBi;H面主瓣宽度8.6o,副瓣电平-21.2 dB;功率容量达到1.6 GW。3.组阵研究以所设计单根漏波波导天线为阵元,研究了漏波波导天线的组阵问题,着重讨论了单元天线组阵过程中各个阵元间的互耦,优化设计及波束扫描。通过仿真模拟与理论分析,给出了经过优化后的9元天线阵列。研究结果表明,天线阵列波束扫描在±50o范围内都能保持较高的增益水平,同时副瓣得到有效抑制,为实际应用奠定了基础。
[Abstract]:With the development of high power microwave high Power microwave (HPM) technology, the development of compact, portable and environmentally adaptable transmitting antennas has become an urgent demand for the application of HPM technology. In view of L band high power microwave radiation, it is necessary to meet the high power capacity. In order to realize the special demand of high efficiency radiation in small size, this paper focuses on a strong coupling design method of leaky waveguides, and designs the L-band leaky waveguides antenna which is relatively short in length. The designed leaky waveguide antenna has the characteristics of high power capacity and convenient array. The main contents include: 1. The radiation characteristics of the leaky waveguides are studied according to the equivalent circuit of the leaky waveguides, and the transmission line theory and perturbation method are used to study the radiation characteristics of the leaky waveguides. The expressions of propagation constant and attenuation constant with higher approximate order are obtained. In the case of weak coupling radiation, strong coupling radiation and dielectric plate radome, the difference between the numerical simulation results and the theoretical values is compared and analyzed. The method of correcting the deficiency of theoretical calculation is put forward. 2.The antenna design and optimization are designed by numerical simulation, theoretical analysis and other methods. The single L-band leaky wave waveguide antenna is designed and optimized. The simulation results are consistent with the theoretical design. The total length of the antenna designed is about 2.2 m.The radiation efficiency is 95.7m, the port reflection coefficient is -33 dB, the axial angle between the main lobe and the waveguide is 42o, the gain is 15.8 d, the width of the main lobe is 8.6o, the sidelobe level is -21.2 dB, and the power capacity is up to -21.2 dB. To 1.6 GW.3.The array is based on a single leaky waveguide antenna, The problem of array of leaky wave waveguide antenna is studied, and the mutual coupling, optimization design and beam scanning of each element in the array process of element antenna array are discussed. The simulation and theoretical analysis are carried out. The optimized 9 element antenna array is presented. The results show that the beam scanning of the antenna array can maintain a high gain level in the range of 卤50 o, and the sidelobe is effectively suppressed, which lays a foundation for practical application.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN822.4

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