基于阶跃阻抗谐振器的新型双频宽带带通滤波器  

Wide Bandwidth Dual-band Bandpass Filter Based on Step Impedance Resonator

作　　者：胡金萍[1] 李国辉[1] 景冻冻[1] 吴辉[1] 马艳忠[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072

出　　处：《上海大学学报（自然科学版）》2012年第3期231-234,共4页Journal of Shanghai University:Natural Science Edition

基　　金：上海市重点学科建设资助项目(S30108);上海市科委重点实验室资助项目(08DZ2231100)

摘　　要：在传统1/4波长阶跃阻抗谐振器(step impedance resonator,SIR)的基础上,提出一种新型双频宽带带通滤波器(bandpass filter,BPF)的结构及其设计方法,其中心频率为1.90/5.65 GHz,可工作于GSM等无线通信系统中.该滤波器频率覆盖范围广,带宽宽,其第一频段的绝对带宽为980 MHz,第二频段的绝对带宽为960 MHz.该滤波器在基频1.90 GHz的回波损耗低于-25 dB,插入损耗为-0.012 dB.同时,滤波器的两通带隔离度好,结构简单,易于加工.频率响应特性S_(11)和S_(21)的电磁仿真和实测结果非常吻合.Based on the traditional quarter wavelength step impedance resonator （ SIR）, a new dual-band bandpass filter （BPF） with wide bandwidth is proposed. Its center frequencies are 1.90/5.65 GHz, which can be used in wireless communication systems such as GSM. The filter has a wide frequency range, with the absolute bandwidth of the first and second center frequencies being 980 and 960 MHz respectively. At 1.90 GHz, the proposed BPF has return loss less than -25 dB and insertion-loss less than -0. 012 dB. The BPF has better isolation between the two passband and a simple structure for easy manufacturing. Simulated frequency responses S11 and S21 of the filter agree with the measured results.

关 键 词：双频滤波器 带通滤波器 阶跃阻抗谐振器 宽带 

分 类 号：TN713[电子电信—电路与系统]