高选择性吸收式双频平衡带通滤波器的设计  

Design of a High-Selectivity Absorptive Dual-Band Balanced Bandpass Filte

作　　者：张一凡[1] 吴永乐[1] 汪庆 王卫民[1] ZHANG Yifan;WU Yongle;WANG Qing;WANG Weimin(School of Integrated Circuits,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京邮电大学集成电路学院,北京100876

出　　处：《北京邮电大学学报》2023年第4期1-8,共8页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(U20A20203,61971052);中央高校基本科研业务费专项项目(2021XD-A07-2);广东省重点领域研发计划项目(2020B0101080001)。

摘　　要：提出了一种具有宽带共模噪声抑制和吸收性能的高选择性双频平衡带通滤波器。通过改变耦合线的阻抗参数可以调节两个通带的中心频率,改变耦合线和加载枝节的电长度可以控制传输零点和双通带的带宽。通过加载4个接地电阻,所提滤波器可以实现宽带共模噪声吸收,并具有良好的共模噪声抑制性能。为了验证所提滤波器的性能,加工了一款中心频率为0.71 GHz和2.37 GHz的双频平衡带通滤波器。实测结果表明,该滤波器差模滤波性能良好,具有多个传输零点。在0~4.04 GHz频率范围内共模噪声抑制大于28 dB,在0~3.67 GHz频率范围内共模噪声吸收大于10 dB,在0~4.37 GHz频率范围内共模噪声的吸收率大于90%,对于共模噪声的消除具有良好的提升效果。A high-selectivity dual-band balanced bandpass filter is proposed,which can achieve wideband common-mode noise suppression and absorption.Two operational frequencies can be adjusted by the impedances of coupled-lines.Transmission zeros and bandwidths can be controlled by changing the electrical lengths of coupled-lines and loaded stubs.The filter can realize the wideband common-mode noise absorption and suppression by loading four grounded resistors.A dual-band balanced bandpass filter centered at 710 MHz and 2.37 GHz is fabricated for demonstration.The measured results indicate that the balanced bandpass filter has good differential-mode filtering performance with multiple transmission zeros.The common-mode suppression is better than 28 dB from 0 to 4.04 CHz.The common-mode noise absorption is better than 10 dB from O to 3.67 GHz,and the absorption rate of common-mode noise is greater than 90%from 0 to 4.37 CHz,which indicates significant improvements in term of common-mode noise elimination.

关 键 词：共模噪声吸收 双频平衡滤波器 共模噪声抑制 高选择性 电阻加载 

分 类 号：TN713[电子电信—电路与系统]