Design and optimization of complementary frequency selective surface using equivalent circuit model for wideband EMI shielding

ABSTRACT

The electromagnetic interference (EMI) caused by microwave sources leads to the malfunction and faulty readings of many real-time systems. Hence it is essential to provide EMI shielding for sensitive electronic devices and chambers. An array of periodic elements offers advantages such as transparency and opacity at selected frequencies with a lower weight. In this regard, two closely coupled periodic complementary conducting elements; popularly known as complementary frequency selective surfaces (CFSS) has been analysed for wideband EMI shielding application. A simple equivalent circuit (EC) in conjunction with the transmission line (TL) model is used to analyse the response of the presented element. Further, an extensive parametric study of CFSS aimed at their EC model optimization is presented. The CFSS exhibits a highly stable response with two controllable passbands for normal and oblique incidences. The validity of the proposed method is verified with the full-wave simulations and measured results of the fabricated prototype in a free space measurement setup.

KEYWORDS:

• Babinet’s principle
• complementary FSS
• electromagnetic interference
• EC model
• electromagnetic interference
• electromagnetic shielding
• frequency selective surface
• shielding effectiveness
• TL model

Acknowledgments

Authors would like to thank Dr D. C. Pande, Distinguished Fellow, DRDO-LRDE, and Dr Shiv Narayan, Senior Scientist, Centre for Electromagnetics, CSIR-NAL, Bangalore, India for their valuable discussions and technical support.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Varikuntla Krushna Kanth http://orcid.org/0000-0002-7429-8386

Additional information

Funding

This work was supported by The Department of Higher Education, MHRD, Government of India [grant number F.NO. 17-2/2014-TS.I].

Notes on contributors

Varikuntla Krushna Kanth

V. Krushna Kanth received his B.Tech degree from JNTUA, Andhra Pradesh, India, in 2012 and M. Tech. degree in Electronics Engineering from Pondicherry University, India, in 2015. He has research experience of one year at Centre for Electromagnetics (CEM) of CSIR-National Aerospace Laboratories (CSIR-NAL), Bangalore, India. He is presently a research scholar (PhD) at the Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli (NIT-T), India. He is a student member of IEEE, EuMA, IEEE APS society, IEEE MTT society, IEEE Electromagnetic compatibility society, IEEE Electronics Packaging Society, IEEE Instrumentation and Measurement Society, IEEE Signal Processing Society and the Corresponding Member of URSI. Krushna Kanth is the chairman of IEEE MTT and APS Student Branch Chapter of NIT-T. He has more than 20 research papers and co-authored a Springer brief. Krushna Kanth won the first prize in DRDO Dare-to-Dream innovation contest 2019. His current area of research interest includes planar periodic structures, planar MICs, frequency selective surfaces, Metamaterials, radome, absorbing structures/absorbing materials, RCS field computation and Substrate Integrated Waveguide Technology.

Singaravelu Raghavan

S. Raghavan is a senior professor at the Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, India. He was awarded the PhD. degree from IIT- Delhi, India in 2001. He is having 35 years of educational activity and research experience in the area of RF and Microwave. He is the recipient of the Best Teacher Award for the year 2007–2008, Best Faculty Award for Electrical and Electronics division (P. K. Das Memorial Award) for the year 2010–2011, Life Time Achievement in Microwave Engineering, Honorary Fellowship of Ancient Sciences and Archaeological Society of India. He received IETE Smt Ranjana Pal award in 2019. He is a senior member (SM) in IEEE-MTT, ASP, EMBS, and CSI. Fellow in IETE, FIE, BESI, ATMS and Life Member (LM) in ISTE, ISSS, SEMCE, MRSI, IATLIS, ILS, NPC, IAMI, BMES, SBAO, STERM, ASI. Dr Raghavan has authored or co-authored more than 500 scientific research papers and technical reports.