互补开环谐振器低通滤波器的设计

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.

Design of Lowpass Filter Using Complementary Open Loop Resonators

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.