高性能可调微带滤波器的分析与设计

发布时间：2018-01-12 19:19

本文关键词：高性能可调微带滤波器的分析与设计　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在无线通信技术飞速发展的当今,可调滤波器作为可重构系统中的关键部件,能够有效利用有限的频谱资源,缓解频谱资源日益紧缺的状况。因此,近年来,受到国内外学者越来越广泛深入的研究。其中,由于加载变容二极管的可调滤波器在调节速率、调节范围、成本、尺寸等方面有着显著优势,因此在可调滤波器的研究中变得很热门。本文以变容二极管为基础,设计了几种高性能可调微带滤波器,主要研究内容如下:1.基于折叠型开环谐振器的可调滤波器:以折叠型开环谐振器直接耦合输入/输出馈线,不仅降低了结构复杂度,同时也保证通带独立可调,相互之间没有影响;将谐振器设计成不对称的结构形式,在调节过程中相对带宽保持不变;另外,在谐振器中心位置处加载串联的电容、电阻,以提高带外谐波的抑制。2.基于双复合右/左手结构的可调滤波器:高性能、小型化已成为可调滤波器的主要研究趋势之一。与传统的谐振器相比,双复合右/左手谐振器的尺寸更小,因此,用于小型化滤波器的设计更有优势。通过在双复合右/左手谐振器的不同位置处加载变容二极管,设计实现了两种小型化的中心频率可控的可调滤波器。另外,在端口与谐振器之间加入外部品质因数调节网络,实现了在调节过程中良好的带内匹配特性。3.基于双复合右/左手结构的可调带宽滤波器:通过在双复合右/左手谐振器之间加入带宽控制网络,设计实现了频率固定、带宽可控的小型化可调滤波器。结合基于双复合右/左手结构的调频滤波器,设计了频率、带宽同时可控的小型化全可调滤波器。
[Abstract]:With the rapid development of wireless communication technology, tunable filter, as a key component of reconfigurable system, can effectively utilize limited spectrum resources and alleviate the increasing shortage of spectrum resources. Therefore, in recent years. Domestic and foreign scholars have been more and more extensive and in-depth research. Among them, the adjustable filter loaded with varactor diode has significant advantages in adjusting rate, adjusting range, cost, size and so on. Therefore, the research of tunable filters has become very popular. Based on the varactor diode, several kinds of high performance tunable microstrip filters are designed in this paper. The main research contents are as follows: 1. Tunable filter based on folded open-loop resonator: using folded open-loop resonator to directly coupling input / output feeders not only reduces the structural complexity. At the same time, it also ensures that the passband can be adjusted independently and has no influence on each other. The resonator is designed as an asymmetric structure, and the relative bandwidth remains constant during the adjustment process. In addition, the capacitors and resistors in series are loaded at the center of the resonator to improve the suppression of out-of-band harmonics. 2.The tunable filter based on double-compound right-hand structure: high performance. Miniaturization has become one of the main research trends of tunable filters. Compared with traditional resonators, the size of double-compound right-hand resonators is smaller than that of conventional resonators. It is more advantageous to design miniaturized filters. By loading varactor at different positions of double compound right / left hand resonators, two miniaturized tunable filters with controllable center frequency are designed and implemented. An external quality factor adjusting network is added between the port and the resonator. The tunable bandwidth filter based on double compound right / left hand structure is realized. The bandwidth control network is added between double compound right / left hand resonators. A miniaturized tunable filter with fixed frequency and controllable bandwidth is designed, and a miniaturized fully adjustable filter with controllable frequency and bandwidth is designed.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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