基于传统的贴片型双模微带带通滤波器,提出了一种结构新颖、简单的滤波器。该结构是在十字形贴片谐振器上刻蚀正交的T形槽通过中心处的方开槽相连。对该结构进行优化,优化后的滤波器能在通带两侧都产生衰减极点,提高阻带的抑制能力,同时保证滤波器的小型化。该滤波器仿真结果表明通带中心频率为2.75GHz,最大回波损耗优于-32dB,通带内最小插入损耗为0.60dB,3dB带宽达到59.8%,实测和仿真结果相一致。 Based on the traditional SMD dual-mode microstrip band-pass filter, a novel and simple filter is proposed. The structure is in the cross-shaped chip resonator etching orthogonal T-shaped groove through the center of the square groove connected. The structure is optimized. The optimized filter can generate attenuation pole on both sides of the passband to improve the rejection of the stopband and ensure the miniaturization of the filter. The simulation results show that the center frequency of the passband is 2.75GHz, the maximum return loss is better than -32dB, the minimum insertion loss in the passband is 0.60dB and the 3dB bandwidth is 59.8%. The measured and simulation results are in good agreement.