Ku波段铁氧体微带线环行器的设计与仿真

发布时间：2018-05-12 07:05

本文选题：环行器 + 微带线　；参考：《杭州电子科技大学》2015年硕士论文

【摘要】：本文采用钇铁石榴石(YIG)薄膜材料设计了一种工作在Ku波段的微带线环行器,并对其进行了仿真优化。传统的环行器一般采用带状线结构,但是随着现代微波集成电路广泛采用,要求环行器要向小型化、集成化方向发展,同时在性能上要求损耗小、频带宽,并且要满足低成本、批量生产的商业要求。因此,开展微带线环行器的研究具有重要意义。本文主要做了以下几点工作。(1)对电磁场理论、微带线理论以及环行器的相关理论进行了分析和整理,得出了微带线结构中电磁波处于准TEM波形式、S参数的推导方法、负载匹配的原理及方法;(2)根据理论以及工艺情况设计了工作在Ku波段的环行器的初步结构;(3)从设计参数和阻抗匹配两方面对环行器进行仿真研究,得出环行器的中心频率随着中心结半径、薄膜厚度、外加磁场强度、磁化半径的增大而减小,并在波端口高度和宽度分别在4h和2~8w、耦合角为0.3、凹槽深度为基片厚度的80%~90%时有较好环行效果,采用指数渐变线匹配可以取得较大的工作带宽;(4)根据设计尺寸结合真空镀膜以及光刻工艺制作出器件实物,并进行了初步测试。本文最终设计出了工作在Ku波段的微带线环行器,其最小插入损耗为0.5dB、最大隔离度为40dB、最小电压驻波比为1.05、相对带宽达10%,体积小于10mm×10mm×3mm,满足小型化的要求。根据本文设计的微带线环行器,相关的组装与测试工作已经展开,文中关于薄膜环行器的一些结论及设计结果,可以为今后小型化环行器的设计提供依据。
[Abstract]:In this paper, a microstrip circulator working in Ku-band is designed and optimized by using yttrium iron garnet (YIG) thin film material. The traditional circulators generally use banded line structure, but with the wide adoption of modern microwave integrated circuits, the circulators should be miniaturized and integrated, and the performance of the circulators should be reduced, bandwidth and low cost should be satisfied. Commercial requirements for mass production. Therefore, the research of microstrip circulator is of great significance. In this paper, the theory of electromagnetic field, the theory of microstrip line and the theory of circulator are analyzed and arranged, and the derivation method of the electromagnetic wave in the form of quasi TEM wave in the structure of microstrip line is obtained. The principle and method of load matching are as follows: according to the theory and technology, the preliminary structure of the Ku-band circulator is designed. The design parameters and impedance matching of the circulator are simulated and studied. It is concluded that the central frequency of the circulator decreases with the increase of the central junction radius, the thickness of the film, the intensity of the external magnetic field and the magnetization radius. When the height and width of the wave port are 4 h and 2 ~ 8 ws respectively, the coupling angle is 0.3, and the depth of the groove is 80 ~ 90, the circular effect is better when the depth of the groove is the thickness of the substrate. A large working bandwidth can be obtained by using exponential gradient line matching. According to the design size and vacuum coating and photolithography, the device object is fabricated, and the preliminary test is carried out. In this paper, a Ku-band microstrip circulator is designed. The minimum insertion loss is 0.5 dB, the maximum isolation is 40 dB, the minimum voltage standing wave ratio is 1.05, the relative bandwidth is 10, and the volume is smaller than 10mm 脳 10mm 脳 3mm, which meets the requirement of miniaturization. According to the microstrip line circulator designed in this paper, the related assembly and testing work has been carried out. Some conclusions and design results of the thin film circulator can provide the basis for the design of miniaturized circulators in the future.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM277;TN621

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