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

Abstract

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).

KEYWORDS:

• CPW
• Dual-band
• Metamaterials
• MSRR
• NF

Acknowledgements

The authors would like to acknowledge Mr Dipesh Debnath, Lab technician, National Institute of Technology, Agartala and ISRO project on “Applicability of Electromagnetic Metamaterial in Antenna and Microwave Circuits for use in Space Applications” for their great support.

Additional information

Notes on contributors

Arpita Mandal

Arpita Mandal received the bachelor's degree (BTech) from Techno India Banipur, Kolkata, India in electronics and communication engineering in 2015 and completed the post-graduation (MTech) in the field of communication engineering from Heritage Institute of Technology, Kolkata, India in 2017. Currently, she is pursing PhD from National Institute of Technology, Agartala, India in the Department of Electronics and Communication Engineering. Her areas of interest include RF and microwave circuits.

Tamasi Moyra

Tamasi Moyra received the AMIE (India) degree in electronics and communication engineering from the Institution of Engineers, India, in the year of 2003. She did ME in the year of 2007 from Bengal Engineering and Science University, Shibpur, India, in the Department of Electronics and Telecommunication Engineering. She received her PhD degree in the year of 2014 from the Department of Electronics and Telecommunication Engineering at Indian Institute of Engineering Science and Technology (IIEST), Shibpur, India. Presently, she is working as an assistant professor in the Department of Electronics and Communication Engineering at the National Institute of Technology, Agartala. She has published more than 25 research articles in different peer-reviewed journals, international conferences and book chapters. Her current research interests include the planar circuits, microstrip filters, antenna elements, LHM, meta-materials, etc. She is a member of the Institution of Engineers and IEEE. Email: [email protected].