In this article, a coplanar waveguide (CPW) based compact low loss notch filter (NF) with sharp roll–off is proposed. At the beginning, the proposed NF is designed using an array of conventional Multiple Split Ring Resonator structure (MSRR), then it is replaced by modified MSRR structure in array to improve the sharpness factor in dB/GHz. This array of modified MSRR structure is behaving like a metamaterial unit cell. The proposed NF operates at resonant frequency of 2.56 GHz with 3 dB fractional bandwidth (FBW) of 4.68%, a roll-off factor (ROF) of 672 dB/GHz, and passband insertion loss of 0.35 dB. A parametric study has been done to obtain the relationship between the ring perimeter of the MSRR and the resonant frequency of the NF. Finally, a dual-band notch filter (DBNF) is designed by using an array of four modified MSRR structures. The EM simulated, circuit simulated, and measurement results of the proposed structure are in good agreement with each other. The proposed CPW based NF is useful for various applications like LTE (2600 MHz), Wimax (2500 MHz), and FCC ID (2.68 GHz).

在本文中，提出了一种基于共面波导（CPW）的具有锐滚降的紧凑型低损耗陷波滤波器（NF）。首先，所提出的NF是使用传统的多裂环谐振器结构（MSRR）阵列来设计的，然后用阵列中改进的MSRR结构代替，以提高dB/GHz的锐度因子。这个经过修改的 MSRR 结构阵列的行为就像一个超材料晶胞。所提出的 NF 工作在 2.56 GHz 谐振频率，3 dB 分数带宽 (FBW) 为 4.68%，滚降因子 (ROF) 为 672 dB/GHz，通带插入损耗为 0.35 dB。为了获得 MSRR 的环周长与 NF 的谐振频率之间的关系，我们进行了参数研究。最后，使用四个改进的 MSRR 结构阵列设计了双带陷波滤波器 (DBNF)。所提出结构的电磁仿真、电路仿真和测量结果彼此吻合良好。所提出的基于 CPW 的 NF 适用于各种应用，例如 LTE (2600 MHz)、Wimax (2500 MHz) 和 FCC ID (2.68 GHz)。