可重构滤波器的研究与设计

发布时间：2018-03-29 19:23

本文选题：可重构滤波器　切入点：变容二极管　出处：《电子科技大学》2017年硕士论文

【摘要】：近年来,通讯技术发展迅猛,需要支持多个网络协议的通信应用越来越多。可重构滤波器作为可重构射频前端的重要组成部分,在保证滤波器通带选择的同时,还要满足各类可重构功能。因此,调谐速度快、调谐模式多、体积小集成度高成本低、损耗小和高可靠性的可重构滤波器成为研究热点。本文采用以调节方式便捷的变容二极管和PIN二极管作为可重构元件,通过研究加载方式和分析可重构原理,在传输线末端以及谐振器之间引入可重构元件,利用奇偶模分析法和电磁仿真软件进行计算和验证,最终设计了三款不同功能的可重构滤波器:1.基于对E型双模谐振器进行的奇偶模分析,通过在枝节处引入变容二极管,设计出双通带频率可重构的带通滤波器。变容二极管影响了偶模的谐振频率,通过选用变容比大的二极管以及合适的馈电方式,实现了第二通带中心频率宽幅度变化;当两个通带的中心频率重合时,可以实现单双通带切换的功能,并且保证两个通带的绝对带宽不变。2.经过对多模谐振器的研究,在E型双模谐振器上加载开路枝节形成三模谐振器,设计了一款宽带带通滤波器,通带内群延时较平坦,通带选择性较好。紧接着分析了该三模谐振器的谐振特性,获得了三个极点的变化规律,上下两个开路枝节长度分别控制高低频极点的位置,中间传输线的长度控制中间极点的位置。进而通过在传输线两端以及开路枝节末端引入变容二极管,设计了一款中心频率不变,绝对带宽可重构的带通滤波器。3.在前两个可重构滤波器设计的基础上,最后完成了三个三节SIR单元通过变容二极管相互耦合,实现中心频率和带宽独立可重构的带通滤波器。采用PIN二极管作为射频开关,通过四选一通路,选择不同阻抗和电长度的接地传输线,完成中心频率可重构;在其中一路通路下,调节用于谐振器之间耦合的变容二极管,改变耦合系数,完成带宽可重构。三款可重构滤波器都经过分析、讨论和验证,实测结果的可调范围较宽且易于调控,同时实现了小型化和高稳定性。
[Abstract]:In recent years, the rapid development of communication technology, more and more communication applications need to support multiple network protocols. The reconfigurable filter is an important part of the reconfigurable RF front-end, the filter passband choice at the same time, but also to meet all types of reconfigurable function. Therefore, the tuning speed, tuning mode, small volume integration high cost, low loss and high reliability of the reconfigurable filter has become a research hotspot. This paper used to adjust the convenient way of varactor diodes and PIN diodes as reconfigurable components, through the research and analysis of reconfigurable loading principle, between the end of the transmission line resonator and the reconfigurable components, calculation and verification and analysis the electromagnetic simulation software using the parity mode, the final design of three different functions of the reconfigurable filter: 1. parity on E dual-mode resonator based on analysis by The introduction of the variode in detail, design a dual band Frequency Reconfigurable bandpass filter. The varactor affects the resonant frequency even mode, by using varactor diodes and the appropriate ratio of the feed mode, to achieve the second passband center frequency range change; when the two passband center the frequency of overlap, can achieve single Shuangtong with switching function, and ensure the two passband constant absolute bandwidth.2. based on multimode resonators, the E dual-mode resonator loaded on open stub form the third mock exam resonator, a wide band bandpass filter, the passband group delay is relatively flat,. With good selectivity. Followed by analysis of the resonant characteristics of the third mock exam resonators, obtained the variation of the three poles, two upper and lower open stub length respectively control the high and low frequency pole position, controlling the length of transmission line in the middle Between the pole position. Then through the transmission line at both ends and open stub end into the varactor diode, design a center frequency constant absolute bandwidth of reconfigurable bandpass filter in.3. two based reconstruction filter design, and finally completed the three three SIR unit by varactor diode coupling and realize the independent reconfigurable bandpass filter with center frequency and bandwidth. Using PIN diode as the RF switch, a path selection by four different impedance and electrical length of the grounding line, complete the center frequency reconfigurable; in one channel, is used to adjust the coupling between the variable capacitance diode resonator, coupling complete bandwidth coefficient, reconfigurable. Three reconfigurable filter are analyzed, discussed and verified, the measured results of the wide adjustable range and easy to control, and to achieve the miniaturization and high stability.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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