基于SRR-DGS 新型高选择性带通滤波器的设计

通过在阶梯阻抗谐振器(Stepped Impedance Resonators, SIR)上加载开口谐振环缺陷地结构(Split-Ring Resonator Defected Ground Structure, SRR-DGS),设计了一款具有高选择性和较好带外抑制性能的带通滤波器。测试结果表明,该滤波器的3 dB 工作频带为2. 56 ~2. 77 GHz (7. 9%),带内最大插入损耗为0. 8 dB。此外,在通带两侧各有两个传输零点,分别位于2. 17 GHz、2. 48 GHz、2. 86 GHz 和3. 81 GHz,带外抑制均大于30 dB,表明该滤波器具有较好的带外抑制特性。同时,仿真与测试结果吻合较好,验证了该滤波器设计方法的有效性。

Design of Bandpass Filter with High Selectivity Based on Split-RingResonator Defected Ground Structure

In this paper, a novel bandpass filter (BPF) with high selectivity and wonderful out-of band suppression isproposed by adding Split-Ring Resonator (SRR) defected ground structure (DGS) on the conventional stepped impedanceresonators (SIR). The measured 3 dB bandwidth of the proposed BPF is 2.56 ~2.77 GHz (7.9%), the maximum measuredinsertion loss is 0. 8 dB within passband. Besides, there are four transmission zeros located at 2. 17, 2. 48, 2. 86, and 3. 81GHz, the out-of band suppression is better than 30 dB, indicating that the proposed BPF has good suppression. Moreover,the measurements and simulations are in good agreement with each other, which means that this design is effective.