College of Electronics and Information Engineering, Liaoning Technicial University, Huludao, Liaoning Province, China.
Liaoning Key Laboratory of Radio Frequency and Big Data for Intelligent Applications, Huludao, Liaoning Province, China.
PLoS One. 2024 Aug 2;19(8):e0306730. doi: 10.1371/journal.pone.0306730. eCollection 2024.
A novel compact and highly selective Ultra Wide Band (UWB) filter is proposed using multimode resonator (MMR) technology. To begin with, the filter's ultra-wideband performance is achieved by coupling a stepped-triangular multimode resonator with input-output feedlines. Furthermore, dual-notch band characteristics are realized at 6.80 GHz and 9.82 GHz, employing asymmetric coupled lines and the split ring resonator (SRR) methods. Eventually, by using a Defected Ground Structure (DGS), the filter's correct transmission zero is deepened, further enhancing the out-of-band suppression performance at higher frequencies. The measured results are in excellent agreement with the experimental results, and the filter has a passband range of 3.52-11.68 GHz, a center frequency of 7.59 GHz, an insertion loss of just 0.61 dB, and a return loss of more than 18 dB. The transmission zeros have a rejection capability of more than 47 dB attenuation, and the rectangular coefficient of the filter is 1.34, which is outstanding for filtering out the interference signals in the parasitic passband with superior selectivity. The overall structure is compact, and the size is just 0.41λg×0.20λg. The filter can be used for UWB system filtering and also to avoid interference from some Wireless Local Area Network (WLAN) IEEE 802.11 series and x-band satellite link frequency bands.
提出了一种使用多模谐振器（MMR）技术的新型紧凑且高度选择性的超宽带（UWB）滤波器。首先，通过将阶跃三角形多模谐振器与输入输出馈线耦合，实现了滤波器的超宽带性能。此外，通过使用不对称耦合线和分裂环谐振器（SRR）方法，在 6.80GHz 和 9.82GHz 处实现了双陷波频带特性。最终，通过使用缺陷地结构（DGS），滤波器的正确传输零点得到了加深，进一步提高了高频带外抑制性能。测量结果与实验结果非常吻合，滤波器的通带范围为 3.52-11.68GHz，中心频率为 7.59GHz，插入损耗仅为 0.61dB，回波损耗大于 18dB。传输零点具有超过 47dB 衰减的抑制能力，滤波器的矩形系数为 1.34，对于滤除寄生通带中的干扰信号具有出色的选择性。整体结构紧凑，尺寸仅为 0.41λg×0.20λg。该滤波器可用于 UWB 系统滤波，也可用于避免一些无线局域网（WLAN）IEEE 802.11 系列和 x 波段卫星链路频段的干扰。
