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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).

Designing and Validation of Miniaturized CPW Based Microwave Notch Filter Using Loaded Modified Multiple Split Ring Resonator (MSRR)