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。 Based on the microstrip square ring resonator, a new kind of perturbation method is adopted to realize the odd-even mode splitting, and the mode splitting mechanism is analyzed. Adopt ladder impedance microstrip line structure to realize strong coupling between input / output and dual-mode resonator, forming a broadband band-pass filter. The test results show that the center frequency of the filter is 4.9 7 GH z, the minimum insertion loss in the passband is 1.3 3 d B, the relative bandwidth of 3 d B is 2 4.7 5%, and it has quasi-elliptic function response and improved stopband rejection characteristic.