复杂罩壁结构天线罩电性能研究及测试

发布时间：2018-10-20 16:14

【摘要】：毕业论文针对天线罩工程设计中的实际问题,结合具体天线罩设计任务,以等效传输线理论为基础,开发了多层介质平板天线罩分析软件;结合天线阵列天线罩的设计,对天线罩相位不一致性进行了研究;同时,以透波率为优化目标,对A夹层变芯层厚度天线罩的设计进行了介绍,采用物理光学法验证了变芯层厚度天线罩在透波率和插入相位移方面的优势。本文的主要工作总结如下:(1)基于等效传输线理论推导了平板天线罩的计算方法,分析了A夹层结构天线罩蒙皮厚度、芯层厚度和入射角对透波率的影响。研究了不同中间蒙皮厚度情况下,C夹层结构天线罩的透波性能,并对比分析了A夹层结构和C夹层结构的宽频带性能。在此基础上,编制了A夹层结构和C夹层结构平板天线罩计算软件,使天线罩的设计更加直观方便;(2)总结了平板天线罩的测试方法及相关技术,结合具体天线罩设计任务,设计了高透波率平板天线罩和宽频带平板天线罩,通过对试验件进行多次测试,验证了设计的正确性和有效性。在此基础上,研究了不同油漆涂料对平板天线罩透波率的影响;(3)介绍了天线阵列的测向原理,提出了天线罩相位不一致性的概念,用以衡量天线罩对天线阵列测向误差的影响。通过实物测试,确认了带罩天线阵列测向误差与相位不一致性成正相关的关系。实验结果表明:采用相位不一致性来衡量天线阵列天线罩电性能的有效性;(4)在透波率最大的条件下,分析了最佳半波长罩壁厚度和最佳A夹层芯层厚度随入射角的变化,提出了利用变芯层厚度实现天线罩高透波率的方法。介绍了A夹层变芯层厚度天线罩的设计方法,最后利用物理光学法,验证了变芯层厚度天线罩在透波率和插入相位移方面的优势。
[Abstract]:In view of the practical problems in the engineering design of the radome, combining with the specific task of the radome design, based on the theory of equivalent transmission line, the software for the analysis of the multi-layer dielectric flat antenna radome is developed, and the design of the antenna array radome is combined with the design of the antenna array radome. The phase inconsistency of the radome is studied, and the design of the A sandwich radome with variable core thickness is introduced with the transmittance as the optimization target. The advantages of variable-core thickness radome in terms of transmittance and insertion phase displacement are verified by physical optics method. The main work of this paper is summarized as follows: (1) based on the equivalent transmission line theory, the calculation method of flat plate radome is derived, and the influence of thickness of cover, thickness of core layer and incidence angle of A sandwich structure on the transmittance is analyzed. In this paper, the transmissivity of C sandwich structure radome with different middle skin thickness is studied, and the broadband performance of A sandwich structure and C sandwich structure are compared and analyzed. On this basis, the calculation software of flat radome with A sandwich structure and C sandwich structure is developed to make the design of antenna radome more intuitionistic and convenient. (2) the test method and related technology of flat radome are summarized, and combined with the design task of specific radome, The high transmittance plate radome and the broadband flat antenna cover are designed. The correctness and validity of the design are verified by many tests on the test piece. On this basis, the influence of different paint coatings on the transmittance of flat antenna radome is studied. (3) the principle of antenna array direction finding is introduced, and the concept of phase inconsistency of antenna cover is put forward to measure the influence of radome on antenna array direction finding error. Through the physical test, the positive correlation between the antenna array direction finding error and the phase inconsistency is confirmed. The experimental results show that the phase inconsistency is used to measure the electrical performance of the antenna array radome. (4) under the condition of the maximum transmittance, the variation of the optimum half-wavelength cover wall thickness and the optimum A sandwich core thickness with the incident angle is analyzed. A method of realizing high transmittance of radome by variable core thickness is proposed. In this paper, the design method of A sandwich radome with variable core thickness is introduced. Finally, the advantages of the cover with variable core thickness in terms of transmittance and insertion phase displacement are verified by using the physical optics method.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN820.81

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