Varactor-tuned quarter-wavelength dual-bandpass filter
Varactor-tuned quarter-wavelength dual-bandpass filter
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DOI：
10.1049/iet-map:20080040
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发表时间：
2009-01
影响因子：
1.7
通讯作者：
E. E. Djoumessi-E.;M. Chaker;K. Wu
中科院分区：
文献类型：
--
作者：
E. E. Djoumessi-E.;M. Chaker;K. Wu
提出并实现了一种可调谐双频带通微带滤波器。它由两对四分之一波长传输线谐振器和两个由开路短截线构成的带阻结构组成。每个工作带通频率，由f1和f2表示，由一对耦合谐振器产生。第一耦合谐振器经由抽头耦合结构馈电，而第二耦合谐振器通过耦合结构馈电。每个带通和谐波抑制的可调谐性通过使用变容二极管电容器修改谐振器的电长度和开路短截线的电长度来实现。最后，一个2.5和4.25 GHz的双频带带通滤波器的设计，制造和测量作为一个例子和22.2%和19.6%的可调谐性，分别为第一和第二频带。这些优良的实验结果验证了所提出的双频带带通滤波器的结构和设计技术。
A tunable dual-band bandpass microstrip filter is proposed and presented. It is composed of two pairs of quarter-wavelength transmission line resonators and two bandstop structures made of open stubs. Each operation bandpass frequency, denoted by f 1 and f 2 , is generated by a pair of coupled resonators. The first coupled resonator is fed via a tap-coupled structure, while the second is fed through a coupling structure. The tunability of each bandpass and harmonic suppression is achieved by modifying the electrical length of the resonators and the electrical length of the open stubs by using varactor-diode capacitors. Finally, a 2.5 and 4.25 GHz dual band bandpass filter is designed, fabricated and measured as one example and a tunability of 22.2% and 19.6%, respectively, is obtained for the first and second bands. These excellent experimental results validate the proposed structure and design technique for dual-band bandpass filters.