基于方形环谐振器的双模宽带滤波器设计  

Dual-mode wideband bandpass filter using square ring resonator

作　　者：雷涛[1] 向天宇[2] 张正平[1] 

机构地区：[1]贵州大学电子信息学院,贵州贵阳550000 [2]贵州师范大学机械与电气工程学院,贵州贵阳550000

出　　处：《电子元件与材料》2014年第9期62-65,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.60666001);贵州省农业攻关资助项目(No.黔科合NY字[2011]3107)

摘　　要：基于微带方形环谐振器,采用一种新的微扰方式来实现奇偶模分裂,并对其模式分裂机制进行分析。采用阶梯阻抗微带线结构实现输入/输出与双模谐振器之间的强耦合,构成了宽带带通滤波器。测试结果表明,该滤波器中心频率为4.9 7 G H z,通带内最小插损为1.3 3 d B,3 d B相对带宽为2 4.7 5%,并且具有准椭圆函数响应,改善了阻带抑制特性。A novel perturbation method was adopted to split odd-mode and even-mode based on the microstrip square ring resonator, and the mechanism of the mode splitting was analyzed. A wideband bandpass filter was structured by using stepped impedance microstrip line to achieve strong coupling between the input/output （I/O） and the dual-mode resonator. The measure results show that the center frequency of the filter is 4.97 GHz, the minimum insertion loss is 1.33 dB in passband, 3 dB fractional bandwidth is 24.75%. Meanwhile, the filter possesses a quasi-elliptic function response which improves the stopband rejection characteristic.

关 键 词：宽带带通滤波器 双模 微带线 方形环谐振器 奇偶模方法 阶梯阻抗线 

分 类 号：TN713.5[电子电信—电路与系统]