A 70 MHz~270 MHz Electrical Tunable LC Bandpass Filter Based on Mixed Coupling and Cross-Coupling
A 70 MHz~270 MHz Electrical Tunable LC Bandpass Filter Based on Mixed Coupling and Cross-Coupling
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DOI：
10.2528/pierl16120104
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发表时间：
2017
影响因子：
0.9
通讯作者：
Linzhi Liu;Qianyin Xiang;Xiangrong Hu;Zongliang Zheng;Zhixiong Di;Q. Feng
中科院分区：
文献类型：
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作者：
Linzhi Liu;Qianyin Xiang;Xiangrong Hu;Zongliang Zheng;Zhixiong Di;Q. Feng
本文提出了一种基于负载半导体变容二极管的可调谐 LC 谐振器的电可调谐带通滤波器。可调谐谐振器之间的磁主导混合耦合用于补偿可调谐滤波器的带宽。交叉耦合是通过使用谐振器和源之间的磁控混合耦合来加载电耦合，并在通带旁边生成两个传输零点。研究了所提出的滤波器的可调机制。对可调谐滤波器进行了分析、设计、制造和测量。测量结果表明，滤波器的频率范围可以从 70 MHz 调谐到 270 MHz，分数带宽从 27% 到 21%。
This paper presents an electrical tunable bandpass filter based on tunable LC resonators loaded with semiconductor varactors. Magnetic dominated mixed coupling between the tunable resonators is utilized to compensate the bandwidth of the tunable filter. Cross coupling is created by using magnetic dominated mixed coupling between the resonators and source to load electrical coupling, and two transmission zeros are generated beside the passband. The tunable mechanism of the proposed filter is studied. The tunable filter is analyzed, designed, fabricated and measured. The measurement shows that the filter can be tuned from 70 MHz to 270 MHz with a fractional bandwidth from 27% to 21%.