互补开环谐振器低通滤波器的设计

Design of Lowpass Filter Using Complementary Open Loop Resonators

为了改善滤波器的性能,提高滤波器的选择性,提出了互补开环谐振器(COLR).基于互补开环谐振器设计小型化平面低通滤波器,它由2个COLR单元及3条开路短截线构成.该滤波器具有低插损、良好的阻带特性和高选择性等特点,其选择性可达73.91 dB/GHz.最后,设计了一个小型化S波段的COLR微带低通滤波器,并进行了加工和测量,仿真和测量结果吻合很好.

To improve the performance and selectivity of filter, a complementary open-loop resonator （COLR） is proposed. A compact planar lowpass filter with COLR is designed, where the cascading filters consist of two COLRs and three open stubs. In this technique, the proposed filter has low insertion-loss, good stop-band characteristic and high selectivity up to 73.91 dB/GHz. To show the potential of the proposed approach, a compact S-band microstrip lowpass filter with COLRs was designed, fabricated and measured. The measured results well agree with the simulations.