8mm准椭圆函数基片集成波导双工组件的研究

发布时间：2018-05-16 19:12

本文选题：基片集成波导 + 准椭圆函数滤波器　；参考：《电子科技大学》2016年硕士论文

【摘要】：双工器和双工技术是当代通信系统中不可缺少的一部分。作为使收发系统可以共用一副天线的重要器件,双工器的研究具有十分重要的实际意义。双工器由带通滤波器和铁氧体环行器构成。双工器使用的导波结构可以分为立体型和平面型。立体型的导波结构,如矩形波导,在损耗、功率容量、Q值等方面的具有显著优势,但是也有体积和集成度上的不足。平面型的导波结构,如微带线,具有与波导相反的特性。其优势在于体积和易集度,不足是损耗、Q值、功率容量方面不甚理想。本文使用了一种新型的平面导波结构基片集成波导,能够兼顾小体积与高性能,且可以使用成熟的PCB工艺和LTCC工艺加工。文章介绍了基片集成波导的传播特性、Ka波段基片集成波导传输线及谐振腔的设计、基片集成波导的功率容量,以及基片集成波导与微带线的匹配,并提出了一种新的圆弧倒角匹配方式。双工器中的滤波器,常用的有切比雪夫型滤波器和椭圆函数型滤波器。其中切比雪夫型滤波器结构简单,易于实现,但是带外抑制度不是特别理想。准椭圆函数型滤波器在阶数相同的情况下有更好的带外抑制度,但是结构复杂,不易于工程上实现。本文通过使用一种准椭圆函数滤波器,不仅在带外得到了令人满意的抑制,而且通过使用交叉耦合结构,使滤波器的结构易于工程实现。设计得到滤波器尺寸为7 mm*1.0275 mm*16.55 mm,中心频率位于36.99 GHz,带宽为1GHz,通带内的插入损耗最大值为-1 dB,端口回波损耗的最大值为-23 dB,通带外500 MHz抑制度大于-33.7 dB,滤波器矩形比为1.56。本文还设计了一个基片集成波导Y型铁氧体环行器,并根据项目需求将其加上微带匹配段,构成了一个T型的具有50欧姆微带线结构的环行器。环行器的通带为33.6~37.17 GHz,通带内驻波比的最大值为1.09,通带内插入损耗的最大值为-0.5dB,通带内隔离度的最小值为-25 dB。本文针对高频微波器件难以准确测试的问题,设计了一套测试精度高、可三维移动的测试夹具,然后对夹具手工调试、校准。最后,用夹具测试了设计的器件,并得出了符合项目要求的结果。
[Abstract]:Duplexer and duplex technology are an indispensable part of modern communication system. As an important device for the transceiver system to share a pair of antennas, the research of duplex is of great practical significance. The duplex consists of a bandpass filter and a ferrite circulator. The guided wave structure used in the duplex can be divided into three-dimensional type and a plane type. Stereoscopic guided wave structures, such as rectangular waveguides, have significant advantages in terms of loss, power capacity and Q value, but there are also shortcomings in volume and integration. Planar guided wave structures, such as microstrip lines, have the opposite properties to waveguides. Its advantage lies in its volume and ease set degree, the deficiency is the loss Q value, the power capacity aspect is not very ideal. In this paper, a new type of planar guided wave structure substrate integrated waveguide is used, which can take account of small volume and high performance, and can be processed by mature PCB and LTCC processes. This paper introduces the propagation characteristics of the substrate integrated waveguide and the design of the Ka-band integrated waveguide transmission line and resonator, the power capacity of the substrate integrated waveguide, and the matching between the substrate integrated waveguide and the microstrip line. A new method of arc chamfering matching is proposed. The filters used in duplex are Chebyshev filter and elliptic function filter. The Chebyshev filter is simple in structure and easy to implement, but the out-of-band suppression is not particularly ideal. The quasi-elliptic function filter has better suppression degree in the case of the same order, but the structure is complex, so it is difficult to be implemented in engineering. By using a quasi-elliptic function filter, not only the out-of-band filter is satisfactorily suppressed, but also the cross-coupling structure is used to make the structure of the filter easy to be realized in engineering. The size of the filter is 7 mm*1.0275 mm*16.55 mm, the center frequency is 36.99 GHz, the bandwidth is 1 GHz, the maximum insertion loss in the passband is 1 dB, the maximum port echo loss is -23 dB, the suppression degree of 500 MHz outside the passband is greater than -33.7 dB, and the rectangular ratio of the filter is 1.56. In this paper, a substrate integrated waveguide Y-type ferrite circulator is designed, and the microstrip matching section is added to it according to the project requirements. A T-type circulator with 50 ohms microstrip line structure is constructed. The pass band of the circulator is 33.6n 37.17 GHz, the maximum value of standing wave ratio in pass band is 1.09, the maximum value of insertion loss in passband is -0.5 dB, and the minimum isolation in passband is -25 dB. Aiming at the difficulty of accurate measurement of high frequency microwave devices, this paper designs a set of test jigs with high testing accuracy and three dimensional movement, and then adjusts and calibrates the jigs manually. Finally, the designed device is tested with the fixture, and the results meet the requirements of the project.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN631.2;TN713

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