射频/微波应用中可调谐滤波器的设计

发布时间：2021-04-14 01:26

　　本论文针对射频和微波应用提出了频率范围为1.5-2.7 GHz的可调带通滤波器。提出的滤波器用于实现高选择性、尺寸微型化/小型化、宽带和恒定绝对带宽（CABW）的同时保持低插入损耗。尺寸微型化/小型化通过使用新型微带阶梯谐振器实现。高选择性通过在通带两侧引入两个可控的传输零点获得。宽带和恒定绝对带宽由一种新型微型化梳状谐振器实现。在低损耗高选择性的设计中,首先提出的是一种紧凑的具有独立配置的第二通带和高带外抑制的单/双频带滤波器。之后用相同的紧凑型接地阶梯谐振器实现了一款频率调谐范围在1.58–1.88 GHz的低损耗可调滤波器,并加入了传输零点调谐特性来获得更好的抑制水平。在宽带和恒定绝对带宽设计中,运用了一种新型的阶梯梳状谐振器来实现高度小型化的固定和可调带通滤波器。首先使用这一结构设计了一款相对带宽62.5%的宽带滤波器,面积仅有6.5×8.5 mm²。另一款可调带通滤波器具有宽调谐范围1.6-2.7 GHz和恒定绝对带宽（360±10）MHz,尺寸仅有6.7×8.7 mm²。此外,还引入了品质因数控制来进一步提高滤波器特性,同时提供了... 

【文章来源】：电子科技大学四川省 211工程院校 985工程院校 教育部直属院校

【文章页数】：89 页

【学位级别】：硕士

【文章目录】：
摘要
ABSTRACT
Chapter 1 Introduction
    1.1 Motivation
    1.2 Thesis Goals
    1.3 Thesis Outlines
Chapter 2 Background
    2.1 Basic Filter Theory
        2.1.1 Lowpass Prototype Filters
            2.1.1.1 Chebyshev Lowpass Prototype Response and Transfer Function
            2.1.1.2 Butterworth （Maximally-Flat） Lowpass Prototype Response and Transfer Function
            2.1.1.3 Quasi-Elliptic Lowpass Prototype Response and Transfer Function
        2.1.2 Immittance Inverters
        2.1.3 Lowpass to Bandpass Frequency Transformation
    2.2 Tuning Mechanisms
        2.2.1 Capacitance Tuning
        2.2.2 Inductance Tuning
        2.2.3 Capacitance-Inductance Tuning
    2.3 Tunable Filter Technology
        2.3.1 Mechanically Tunable Filters
        2.3.2 Ferroelectric BST Tunable filters
        2.3.3 Ferromagnetic YIG tunable filters
        2.3.4 RF-MEMS tunable filters
        2.3.5 Varactor based tunable filters
            2.3.5.1 Fundamental concepts of varactor diode
            2.3.5.2 Literature Overview of varactor-tuned microwave filters
Chapter 3 Compact Single/Dual-band Bandpass Filter
    3.1 Introduction
    3.2 Basic Design Theory
    3.3 Filter Design and Implementation
    3.4 Dual-bandpass Filter Design and Implementation
    3.5 Fabrication and measurements
    3.6 Summary
Chapter 4 High Selectivity Low-loss Tunable BPF with Transmission Zeros Control
    4.1 Introduction
    4.2 Filter Design & Implementation
        4.2.1 Design Procedure
        4.2.2 Implementation
    4.3 Fabrication and measurements
    4.4 Summary
Chapter 5 Compact Constant Bandwidth Tunable BPF with Wide Tuning Range and Bandwidth Control
    5.1 Introduction
    5.2 Compact Wideband Filter
        5.2.1 Design & Implementation
        5.2.2 Fabrication and measurements
    5.3 Compact constant bandwidth tunable filter with wide tuning range and bandwidth control
        5.3.1 Design & Implementation
        5.3.2 Bandwidth Control
        5.3.3 Fabrication and measurements
    5.4 Summary
Chapter 6 Conclusion and Future Work
    6.1 Conclusion and Contributions
    6.2 Future Work
Acknowledgements
References
Research Results Obtained During the Study for Master Degree



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