Design and implementation of dual-band switching tunable bandpass filter
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摘要：
为了改善频谱资源短缺的现状,设计了一款结构简单、双频带切换的可调谐带通滤波器(Bandpass Filter,BPF).该BPF由2个λ/4的阶跃阻抗谐振器(Step Impedance Resonator,SIR)加载变容二极管构成,而每个SIR的组成又有2部分,通过一个开关二极管连接起来.利用开关二极管在通断状态下表现出来的不同特性,实现了在高、低2个频带内的谐振频率切换;通过调整变容二极管的偏置电压,实现谐振频率的调谐.基于仿真模型加工制作了滤波器实物,测试结果显示,在开关二极管导通时,可在1.76~1.98 GHz之间调谐,插入损耗3.59~4.12 dB;断开时,可在2.26~2.52 GHz之间调谐,插入损耗3.22~4.15 dB,测试与仿真结果基本一致.该款滤波器可有效缓解频谱资源问题,具有较强的实际应用价值.
In order to improve the shortage of spectrum resources,a tunable bandpass filter(BPF)with simple structure and dual-band switching is designed.The BPF is composed of two λ/4 step impedance resonators(SIRs)loaded with varactor diodes,each of which has two parts connected by a switching diode.So the switching of resonant frequency in high and low frequency band is realized by using different characteristics of switching diode in on and off state.In addition,the tuning of resonant frequency is realized by adjusting the bias voltage of varactor diode.At last,the filter is fabricated according to the simulation model.And the measured results show that when the switching diode is turned on,it can be tuned between 1.76-1.98 GHz with insertion loss of 3.59-4.12 dB;when disconnected,it can be tuned between 2.26-2.52 GHz with insertion loss of 3.22-4.15 dB.The results of measuring and simulating are basically consistent.So the filter is highly competitive in practical applications for mitigating spectrum resource problems.FEWER
作者：
王友保 李燎原 郑大鹏
Wang Youbao;Li Liaoyuan;Zheng Dapeng(College of Electronic&Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)
机构地区：
南京信息工程大学电子与信息工程学院
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2020年第1期44-49,共6页
基金：
国家自然科学基金(61673222)。
关键词：
双频带 可调谐滤波器 带通滤波器 变容二极管
dual band tunable filter bandpass filter varactor diode
分类号：
TN713 [电子电信—电路与系统]
