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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Compact tunable dual/Tri-band bandpass filters with multiple zeros
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Compact tunable dual/Tri-band bandpass filters with multiple zeros

机译：紧凑的可调谐双/三带通滤波器，带有多个零

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摘要

Here, compact dual/tri-band bandpass filters (BPFs) with tunable passbands are proposed. The multiband BPFs are designed by combining a BPF with tunable passband and a BPF with fixed passband using a common external coupling line. The former consists of a dual-mode resonator loaded with varactors (DMVLR) and the latter is composed of a quad-mode resonator (QMR). The classical analysis method of odd/even mode is employed to analyse the characteristics of the resonators. The centre frequency (CF) of the tunable passband can be easily tuned by varying the voltage imposed on the varactors. A constant absolute bandwidth (CABW) is obtained over the whole tuning range of frequency by properly adjusting loading positions of the varactors. The single and dual-passband BPFs with fixed passband are obtained by designing the parameters of QMR appropriately. Simulation and measurement results show that the proposed BPFs are of high selectivity, and the resultant filters are of compact size. In addition, the proposed multiband BPFs have four transmission zeroes (TZs). There are two self-adaptive TZs on both sides of the tunable passbands, which are generated by the multipath coupling structure.
机译：在此，提出了具有可调通带的紧凑型双/三带通滤波器（BPF）。通过使用公共外部耦合线将带可调通带的BPF和带固定通带的BPF组合来设计多带BPF。前者由一个装有变容二极管（DMVLR）的双模谐振器组成，后者由一个四模谐振器（QMR）组成。采用奇/偶模式的经典分析方法来分析谐振器的特性。通过改变施加在变容二极管上的电压，可以很容易地调整可调谐通带的中心频率（CF）。通过适当调节变容二极管的负载位置，可以在整个频率调谐范围内获得恒定的绝对带宽（CABW）。通过适当设计QMR的参数，可以得到具有固定通带的单通带和双通带。仿真和测量结果表明，所提出的BPF具有较高的选择性，并且所得滤波器的尺寸紧凑。另外，所提出的多频带BPF具有四个传输零（TZ）。在可调通带的两侧有两个自适应TZ，它们是由多径耦合结构生成的。

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