采用阶梯 T 型谐振器的双陷波 UWB 滤波器

为有效抑制印度国家卫星通信C频段和X卫星频段对超宽带通信系统的干扰，提出了一种新型双陷波超宽带滤波器。该滤波器采用阶梯T型多模谐振器(multimode resonator, MMR)与缺陷地结构(defected ground structure, DGS)的交趾耦合，实现超宽带特性。采用非对称耦合线及在MMR两侧耦合分裂环谐振器的方法，分别在6.67～7.06 GHz, 7.47～7.57 GHz两个频段内产生陷波。实测结果与仿真结果吻合较好，该滤波器的通带范围为3.03～11.50 GHz, 3 dB带宽达到123%,插入损耗仅有0.87 dB,两处陷波中心频率分别在6.87 GHz和7.52 GHz,陷波深度均大于20 dB,且整体尺寸紧凑，仅有16 mm×8 mm大小。

Double notch bands UWB filter using stepped T-shaped resonator

In order to effectively suppress the interference of the C-band of the Indian National Satellite Communication and X-satellitefrequency bands to the ultra-wideband communication system, a new type of dual notch bands UWB filter is proposed. The filter adoptsthe intersection with a stepped T-type multimode resonator (MMR) and a defective ground structure (DGS) to achieve ultra-widebandcharacteristics. Using asymmetric coupling lines and coupling split ring resonators on both sides of the MMR, notchs are generated in thetwo frequency bands of 6. 67 ~ 7. 06 GHz and 7. 47 ~ 7. 57 GHz respectively. The measured results are in good agreement with thesimulation results. The passband range of the filter is 3. 03~ 11. 50 GHz, the 3 dB bandwidth reaches 123%, the insertion loss is only0. 87 dB, and the center frequencies of the two notches are at 6. 87 GHz and 7. 52 GHz, respectively. The depth of notch bands isgreater than 20 dB, and the overall size is compact, only 16 mm×8 mm.