微型巴伦滤波器的研究

发布时间：2018-01-08 12:29

本文关键词：微型巴伦滤波器的研究　出处：《南京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：现代无线网络和通信技术飞速发展,各种网络设备和电子产品都能通过无线方式接入网络进行通信,这一切得以实现都必须依赖至关重要的射频微波模块和射频元器件。常用的军用无线系统和装备如雷达、卫星通信、卫星导航、遥感遥测、遥控等以及民用领域的各种无线电子产品如智能手机、平板电脑、可穿戴设备、智能家电、仪器、医疗设备、汽车电子设备等,都不断的向着小型化、多功能、高性能方向发展。为了实现各种无线系统和电子产品的小型化,占用较大体积的微波射频元器件也需要实现小型化。本文对微型巴伦滤波器进行了研究。传统的巴伦滤波器的设计方法是分别对巴伦和滤波器进行设计,然后通过匹配网络把巴伦和滤波器连接起来组合成一个元件。本文采用了多层耦合短路带状线结构形成谐振级,这种谐振级尺寸小,而且能够同时实现巴伦和滤波器功能,避免了分别独立设计巴伦和滤波器的复杂过程。此外这种谐振级可以很方便地实现多级级联,在多级巴伦滤波器的设计中还可以通过引入交叉耦合产生传输零点提高边带陡峭度和阻带抑制度,因此,与传统方法设计的巴伦滤波器相比这种巴伦滤波器可以获得更好的滤波特性。文中使用LTCC (Low Temperature Co-fired Ceramic,低温共烧陶瓷)技术设计了六款巴伦滤波器,六款巴伦滤波器的尺寸小、结构简单、且都具有很好的相位平衡度和幅度平衡度,滤波性能优良。文中所用的将多种微波分离元器件一体化的设计方法对其他射频分离无源器件的小型化集成设计具有一定的参考价值。六款巴伦滤波器的主要技术参数如下：L波段单级巴伦滤波器利用了加载电容的方法来提高滤波特性,尺寸小于1.1mm×2.1mm×1.1mm,通带为1.6GHz-1.9GHz,相位不平衡度小于±20；S波段二级巴伦滤波器的尺寸小于2.1 mm×1.6mm×1.2mm,通带为3.15GHz-3.75GHz,相位不平衡度小于±2°；S波段三级巴伦滤波器尺寸小于2.1mm×2.5mm×1.2mm,通带为3.9GHz-4.3GHz,相位不平衡度小于±30；C波段四级巴伦滤波器的尺寸小于2.6mm×2.9mm×1.2mm,通带为4.8GHz-5.2GHz,相位不平衡度小于±40：S波段五级巴伦滤波器的尺寸小于2.1mm×3.8mm×1.2mm,通带为2.1GHz-2.3GHz,相位不平衡度小于±3°；S波段六级巴伦滤波器的尺寸小于4.3mm×.9mm×1.6mm,通带为2.7GHz-2.9GHz,相位不平衡度小于±4°；四级、五级、六级结构的巴伦滤波器由于采用了更多的级数同时又引入交叉耦合产生了传输零点,因此具有更加陡峭的边带和更高的阻带抑制特性。六款巴伦滤波器最终的仿真结果都优于设计指标要求,都具有小型化、高性能、高可靠性的特点。
[Abstract]:The rapid development of modern network and wireless communication technology, various network equipment and electronic products can communicate through the wireless access network, this realized it must depend on the critical RF module and RF components. Military radio systems commonly used and equipment such as radar, satellite communications, satellite navigation, remote sensing, remote control, etc. The civilian areas of various wireless electronic products such as intelligent mobile phone, tablet computer, wearable devices, intelligent home appliances, instrumentation, medical equipment, automotive electronic equipment, continue towards miniaturization, multi-function, high performance direction. In order to realize the miniaturization of wireless systems and electronic products, occupy a larger volume of RF and microwave components the need to achieve miniaturization. This paper made a research on micro balun filter. The design method of the traditional balun filter is respectively for balun and filter The design of filter, and then through the network, balun and filter are connected into a combination of components. This paper adopts multilayer coupled stripline resonator stage structure forming circuit, the resonant level of small size, but also can realize balun and filter function, avoids the complex process of designed balun and filter. In addition, the resonant level can easily achieve the cascaded multilevel filter design in the balun can also produce transmission zeros to improve the edge with sharp and stopband suppression, therefore, through the introduction of cross coupled balun filter design and traditional methods can achieve better filtering property than the balun filter using LTCC. In this paper (Low Temperature Co-fired Ceramic, LTCC) technology to design six balun filter, six balun filter has the advantages of simple structure, small size, and With phase equilibrium degree and amplitude of good balance, excellent filtering performance. Has a certain reference value for the miniaturization of integrated design method of various microwave separation components integration in terms of the separation of other RF passive devices. The main technical parameters are as follows: six a balun filter L band single balun using the method of filter capacitors loading to improve the filtering characteristics, size less than 1.1mm * 2.1mm * 1.1mm, band 1.6GHz-1.9GHz, phase unbalance is less than 20; two S band balun filter size less than 2.1 mm * 1.6mm * 1.2mm, band 3.15GHz-3.75GHz, phase unbalance is less than 2 degrees; S band three balun filter size is less than 2.1mm * 2.5mm * 1.2mm, band 3.9GHz-4.3GHz, phase unbalance is less than 30; four C band balun filter size less than 2.6mm * 2.9mm * 1.2mm, pass band 4.8 GHz-5.2GHz, phase unbalance is less than five 40:S band balun filter size less than 2.1mm * 3.8mm * 1.2mm, band 2.1GHz-2.3GHz, phase unbalance is less than 3 degrees; six S band balun filter size less than 4.3mm *.9mm * 1.6mm, band 2.7GHz-2.9GHz, phase imbalance of less than plus or minus 4 degrees; four level, five level, six level structure of the balun filter because of the use of more series is also introduced to generate cross coupling transmission zeros, so it has more steep sideband and higher stopband characteristics. Six balun filter the final simulation results are better than the design requirements. It has the advantages of small volume, high performance, high reliability.

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

【参考文献】