四频带阻及超宽带带通滤波器的研究

发布时间：2018-03-28 03:32

本文选题：四频带带阻　切入点：方形螺旋谐振器　出处：《华中师范大学》2017年硕士论文

【摘要】：微波滤波器作为无线通信领域不可或缺的无源器件,在射频微波学研究领域掀起了一股新热潮。全球微波互联接入(Worldwide Interoperability for Microwave Access,WIMAX)、宽带码分多址(Wideband Code Division Multiple Access,WCDMA)、无线局域网络(Wireless Local Area Networks,WLAN)、超宽带(Ultra Wideband ,UWB)等各种无线通信协议的提出很大程度上加速了能应用于各种通信系统的滤波器技术的研究。其中,多频带和超宽带滤波器技术成为近年来微波滤波器的研究热点。本文主要研究基于微带形式多频带阻和超宽带带通滤波器的设计。第一种是基于阶梯阻抗方形螺旋谐振器的四频带阻滤波器,通过分析具有阶梯阻抗谐振特性的单元螺旋谐振器的电磁特性,最终将单元谐振结构以不同的形式级联而得出一种最优的带阻特性模型,仿真和实验结果相比其他文章的设计的突出点是增加了频带的数量,降低了谐振频率,同时增大了各阻带带宽,在通带插损小于0.5dB的同时提高了滤波器选择性。第二种是一种基于开口环谐振器加载短路枝节的超宽带带通滤波器模型。该模型结构采用经典开口环的变形式作为主谐振器,并在其环口对称加载短路枝节,用奇偶模理论加以分析,实现超宽带带通滤波性能。该滤波器工作频段为2.1 GHz到11.5 GHz,符合美国联邦通信委员会(FCC)规定的超宽带标准。此设计主要突出点在于结构的小型化,工作带宽的增大。
[Abstract]:Microwave filter is an indispensable passive device in the field of wireless communication. There has been a new upsurge in the field of RF microwave research. Various wireless communication protocols such as Worldwide Interoperability for Microwave access WIMAX, Wideband Code Division Multiple access, Wireless Local Area Networks WLAN, UWB Ultra Wideband UWWBs, etc., have been launched in the field of RF microwave research, among other wireless communication protocols, such as WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA, WCDMA and WCDMA. To a great extent, it accelerates the research of filter technology which can be used in various communication systems. Multi-band and ultra-wideband (UWB) filter technology has become a hot topic in microwave filters in recent years. This paper mainly studies the design of multi-band and ultra-wideband bandpass filters based on microstrip form. The first one is based on step impedance square snail. A four-band resistive filter for a rotary resonator, By analyzing the electromagnetic characteristics of the unit helical resonator with step impedance resonance, an optimal band-stop characteristic model is obtained by cascading the resonant structure in different forms. The outstanding points of the simulation and experimental results are that the number of frequency bands is increased, the resonant frequency is reduced, and the stopband bandwidth is increased. The filter selectivity is improved when the passband insertion loss is less than 0.5dB. The second is an ultra-wideband band-pass filter model based on open-loop resonator loading short circuit branch. The model structure adopts the variable form of classical open loop as the main resonator. The short section is symmetrically loaded at the ring mouth and analyzed by the theory of even and odd modes. The performance of UWB bandpass filter is realized. The frequency range of the filter is from 2.1 GHz to 11.5 GHz, which conforms to the UWB standard stipulated by the Federal Communications Commission. The main focus of this design is the miniaturization of the structure and the increase of the bandwidth.
【学位授予单位】：华中师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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