Bandpass Filter With Tunable Bandwidth Using
Bandpass Filter With Tunable Bandwidth Using
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发表时间：
2012
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通讯作者：
Xiaoguo Huang;Q. Feng;Qianyin Xiang
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作者：
Xiaoguo Huang;Q. Feng;Qianyin Xiang
本文提出了一种新型的带宽可调的四模谐振器带通滤波器。通过使用两种类型的微波变容管来调谐谐振频率和传输零点（TZs），可以分别改变通带的高侧边缘和低侧边缘。因此，通过合理调整变容二极管的阻值，可以实现带宽的可调。理论表达式已经推导出的谐振频率和TZs。测试结果表明，在固定中心频率2.0GHz时，带宽可在22%~ 34%之间调谐，回波损耗优于dB。试验结果与模拟结果吻合较好。
In this letter, a novel quadruple-mode resonator bandpass filter (BPF) with tunable bandwidth is proposed. By using two types of microwave varactors to tune the resonant frequencies and transmission zeros (TZs), the high-side edge of the passband and low-side edge of the passband can be separately varied. Therefore, the bandwidth could be tunable with reasonable adjust of the values of varactors. Theoretical expressions have been derived for the resonant frequencies and the TZs. The mea- sured results of the BPF show that the fractional bandwidth can be tuned from 22% to 34% at a fixed centre frequency 2.0 GHz with a return loss better than dB. The tested results show good agreement with simulated results.