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提出了一种新型通带可控、损耗较低的四频带通滤波器结构。该滤波器的组成采用二阶新型多枝节加载四模谐振器。该谐振器有4个可单独控制的谐振模式,致使滤波器的中心频率可单独调控,通过控制两谐振器间的耦合系数,滤波器带宽可控。实验结果表明,该滤波器通带可控并满足小型化的要求,4个通频带中心频率是2.5/3.1/4/5.05 GHz,插入损耗为0.1/0.27/0.13/0.16 dB,每个通带的回波损耗都优于15 dB。实测结果与仿真结果一致。
A new type of four-band band-pass filter with controllable passband and low loss is proposed. The filter is composed of a second-order new multi-branch node loaded four-mode resonator. The resonator has four resonant modes that can be individually controlled so that the center frequency of the filter can be individually controlled. By controlling the coupling coefficient between the two resonators, the bandwidth of the filter can be controlled. The experimental results show that the passband of the filter is controllable and meets the miniaturization requirements. The center frequency of four passbands is 2.5 / 3.1 / 4 / 5.05 GHz and the insertion loss is 0.1 / 0.27 / 0.13 / 0.16 dB. Each passband The return loss is better than 15 dB. The measured results are consistent with the simulation results.