基于交叉耦合的介质加载双工器设计

发布时间：2019-06-26 17:21

【摘要】：随着移动通信技术的飞速发展,通信频率资源的日益匮乏,微波滤波器、双工器等微波无源器件的作用也变得越来越重要。由于微波滤波器性能的优劣对整个通信系统的质量有着至关重要的影响,我们对其性能指标的要求也越来越高。因此,在短时间内研制出体积小、性能高、成本低的滤波器已成为当前研究滤波器的关键技术要求。腔体滤波器由于体积小、性能高、易于实现等功能受到广泛应用,于此同时微波陶瓷介质材料也在不断发展和应用在腔体滤波器中。本文应用腔体滤波器和介质谐振器的基本理论,对腔体滤波器进行了深入的研究,分别设计了一款同轴腔体滤波器和介质腔体滤波器,对比了两种腔体滤波器的性能,并对腔体滤波器的功率容量估测和温度漂移仿真做出了简要的描述。基于上述的设计和研究,总结了一套多种软件协同仿真快速设计腔体滤波器方法,在此基础上设计了一款WCDMA频段陶瓷介质双工器,通过实例设计验证了该方法的有效性。本选题设计的双工器新颖之处在于使用了介质加载并在腔间引入了交叉耦合,采用高品质因数的微波陶瓷介质材料使腔体无载品质因数大大增加并减小插入损耗,在腔间引入交叉耦合减少腔数并改善带外抑制,实现了器件小型化、高性能,与同频段的同轴腔双工器相比,具有显著优势。
[Abstract]:With the rapid development of mobile communication technology and the increasing shortage of communication frequency resources, the role of microwave filters, Duplexers and other microwave passive devices has become more and more important. Because the performance of microwave filter has a vital influence on the quality of the whole communication system, our requirements for its performance index are getting higher and higher. Therefore, the development of small size, high performance and low cost filter in a short time has become the key technical requirement of the current research filter. Cavity filter has been widely used because of its small size, high performance and easy realization. At the same time, microwave ceramic dielectric materials are also constantly developed and applied in cavity filter. In this paper, the cavity filter is deeply studied by using the basic theory of cavity filter and dielectric resonator. A coaxial cavity filter and dielectric cavity filter are designed respectively. The performance of the two cavity filters is compared, and the power capacity estimation and temperature drift simulation of the cavity filter are briefly described. Based on the above design and research, a set of methods for fast design of cavity filter by collaborative simulation of various software is summarized. On this basis, a ceramic dielectric Duplexer in WCDMA band is designed, and the effectiveness of the method is verified by an example design. The Duplexer designed in this paper is novel in using dielectric loading and introducing cross-coupling between cavities. The microwave ceramic dielectric material with high quality factor greatly increases and reduces the insertion loss of the cavity without load, and introduces cross-coupling between cavities to reduce the number of cavities and improve out-of-band suppression, which realizes the miniaturization and high performance of the devices, and has remarkable advantages over the coaxial cavity Duplexers in the same frequency band.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN631.2

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