电调微带滤波器研究与设计
发布时间：2019-03-22 15:56
【摘要】：随着现代无线通信的飞速发展,微波毫米波系统的运用越来越广泛,同时频谱资源的拥挤问题也日益突出。为了更有效地利用有限的频谱资源,同时也为了更好地减小通信系统的体积和复杂度,可调滤波器作为微波可重构系统的重要组成部分因能够同时兼顾体积和性能而受到越来越多科研人员的重视。本文主要研究基于变容二极管的频率和带宽可调带通滤波器的设计。可调滤波器经过几十年的研究,分别在频率和带宽可调方面取得很大的进展,但是在设计中仍存在插损大、调谐范围小、绝对带宽变化、滤波性能不稳定等诸多难题。针对这些问题,本文主要完成了两款频率和带宽可调带通滤波器设计,实现了宽范围调谐、绝对带宽恒定、滤波性能稳定等。本文主要内容如下:首先,简单介绍了奇偶模分析方法,从耦合矩阵出发推导并讨论了滤波器在可调谐状态下的稳定条件,同时对稳定条件中所涉及的耦合系数及品质因数等问题进行详细介绍,接着总结了不同的可调滤波器的的实现方法并总结了各自优缺点。其次,研究了频率和带宽独立可调滤波器的设计。对国内外相关的文献资料进行整理分析,分别介绍了频率可调和带宽可调的实现原理及实现方法。基于上述实现原理及实现方法,从结构、耦合系数、外部品质因数、变容管Q值等方面对可调滤波器性能影响进行分析,设计实现了基于U型谐振器的频率和带宽独立可调滤波器,并对提出的可调滤波器进行了加工和测试,测试结果与仿真结果吻合良好。最后,对滤波性能稳定的微带可调滤波器进行了研究。设计滤波器时考虑外部品质因数的影响,在谐振器和输入输出端口间引入外部品质因数调谐电路。在此基础上,提出设计了一款基于SLR结构的频率和带宽可调滤波器,并对提出的滤波器进行了加工测试,吻合良好的仿真结果和实测结果显示该滤波器具有插损小、滤波性能稳定等优点,实现了宽范围调谐,尤其带宽的宽范围调谐,并且在频率可调过程中绝对带宽恒定不变,带宽可调过程中中心频率保持不变。
[Abstract]:With the rapid development of modern wireless communication, microwave and millimeter wave systems are used more and more widely. At the same time, the congestion of spectrum resources is becoming more and more prominent. In order to make more efficient use of the limited spectrum resources, but also to better reduce the volume and complexity of the communication system, As an important part of microwave reconfigurable system, tunable filters have been paid more and more attention by researchers because they can take both size and performance into account. In this paper, the design of frequency and bandwidth tunable bandpass filter based on varactor diode is studied. After decades of research, the tunable filter has made great progress in frequency and bandwidth adjustable, but there are still many difficult problems in the design, such as large insertion loss, small tuning range, absolute bandwidth variation, instability of filter performance and so on. In order to solve these problems, two kinds of band-pass filters with adjustable frequency and bandwidth are designed in this paper, which can achieve wide tuning, constant absolute bandwidth and stable filtering performance. The main contents of this paper are as follows: firstly, the odd-even mode analysis method is briefly introduced, and the stability conditions of the filter in the tunable state are derived and discussed from the coupling matrix. At the same time, the coupling coefficient and quality factor involved in the stability condition are introduced in detail, then the implementation methods of different tunable filters are summarized and their advantages and disadvantages are summarized. Secondly, the design of frequency and bandwidth independent tunable filter is studied. The related literature at home and abroad is analyzed, and the realization principle and method of adjustable frequency bandwidth are introduced respectively. Based on the above-mentioned realization principle and implementation method, the influence of structure, coupling coefficient, external quality factor and Q value of varactor on the performance of tunable filter is analyzed. The frequency and bandwidth independent tunable filter based on U-type resonator is designed and implemented. The proposed tunable filter is processed and tested. The test results are in good agreement with the simulation results. Finally, the microstrip tunable filter with stable filtering performance is studied. Considering the influence of external quality factor, the external quality factor tuning circuit is introduced between the resonator and the input / output port. On the basis of this, a frequency and bandwidth adjustable filter based on SLR structure is designed, and the processing test of the proposed filter is carried out. The simulation results are in good agreement with the measured results, and the results show that the filter has small insertion loss. The filter performance is stable and the wide range tuning, especially the wide range tuning of the bandwidth, is realized. The absolute bandwidth is constant and the center frequency of the bandwidth adjustable process is constant in the process of frequency adjustment.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
本文编号：2445724
[Abstract]:With the rapid development of modern wireless communication, microwave and millimeter wave systems are used more and more widely. At the same time, the congestion of spectrum resources is becoming more and more prominent. In order to make more efficient use of the limited spectrum resources, but also to better reduce the volume and complexity of the communication system, As an important part of microwave reconfigurable system, tunable filters have been paid more and more attention by researchers because they can take both size and performance into account. In this paper, the design of frequency and bandwidth tunable bandpass filter based on varactor diode is studied. After decades of research, the tunable filter has made great progress in frequency and bandwidth adjustable, but there are still many difficult problems in the design, such as large insertion loss, small tuning range, absolute bandwidth variation, instability of filter performance and so on. In order to solve these problems, two kinds of band-pass filters with adjustable frequency and bandwidth are designed in this paper, which can achieve wide tuning, constant absolute bandwidth and stable filtering performance. The main contents of this paper are as follows: firstly, the odd-even mode analysis method is briefly introduced, and the stability conditions of the filter in the tunable state are derived and discussed from the coupling matrix. At the same time, the coupling coefficient and quality factor involved in the stability condition are introduced in detail, then the implementation methods of different tunable filters are summarized and their advantages and disadvantages are summarized. Secondly, the design of frequency and bandwidth independent tunable filter is studied. The related literature at home and abroad is analyzed, and the realization principle and method of adjustable frequency bandwidth are introduced respectively. Based on the above-mentioned realization principle and implementation method, the influence of structure, coupling coefficient, external quality factor and Q value of varactor on the performance of tunable filter is analyzed. The frequency and bandwidth independent tunable filter based on U-type resonator is designed and implemented. The proposed tunable filter is processed and tested. The test results are in good agreement with the simulation results. Finally, the microstrip tunable filter with stable filtering performance is studied. Considering the influence of external quality factor, the external quality factor tuning circuit is introduced between the resonator and the input / output port. On the basis of this, a frequency and bandwidth adjustable filter based on SLR structure is designed, and the processing test of the proposed filter is carried out. The simulation results are in good agreement with the measured results, and the results show that the filter has small insertion loss. The filter performance is stable and the wide range tuning, especially the wide range tuning of the bandwidth, is realized. The absolute bandwidth is constant and the center frequency of the bandwidth adjustable process is constant in the process of frequency adjustment.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
【参考文献】
相关硕士学位论文 前5条
1 窦艳;微带可调滤波器的研究与设计[D];南京理工大学;2014年
2 毛金荣;高性能可调微波滤波器的理论与设计[D];南京理工大学;2013年
3 刘贝;微带电调可重构滤波器的研究与设计[D];西安电子科技大学;2012年
4 张学顺;多模微带滤波器的研究与设计[D];南京航空航天大学;2012年
5 吴国春;微带开口环电调滤波器设计[D];西安电子科技大学;2010年
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