中文摘要：

基于方型环与开路线相结合的结构设计了一种新型微带双通带带通滤波器．该滤波器通过调节方型环与开路线的尺寸分别获得两个通带．经仿真优化，并制作了实物模型．测试结果表明该滤波器能够工作在2．365 GHz和4．465 GHz，插入损耗都小于3dB．测量结果与仿真曲线一致性较好．该滤波器结构简单、设计方便、体积小、易于加工，便于与其它电路集成，可以广泛应用于射频前端．

英文摘要：

A new dual-band microstrip filter based on square ring and loaded stub is proposed. The center frequencies of its low-band and high-band can be easily adjusted by the dimensions of the square ring and loaded stub. Then the simulations are carried out and the experimental prototype is also made. The measured center frequencies of the optimized filter are 2. 365 GHz and 4. 465 GHz, and the insertion loss is lower than 3 dB. A basic agreement between the simulated and the measured results is obtained. The presented filter has simple structure and small size, and is easy to be designed and realized. Moreover, it is also convenient to integrate with the system, and can be widely used in the radio frequency （RF） front-ends.