Improving performance of mantle cloak for electrically large PEC cylinders by reducing higher-order scattering coefficients

Abstract

Based on the scattering cancellation technique, an approach is proposed to improve the mantle cloak’s performance for electrically large cylinders. The procedure is based on the observation that the number of dominant scattering coefficients and corresponding magnitudes for a cylinder decreases when oriented obliquely to the incident wave. Thus, it is quite advantageous to design a mantle cloak under the oblique incidence than the normal incidence. The proposed method starts with determining the optimum angle of incidence at which if the object is oriented with respect to the incident wave, the maximum scattering reduction can be obtained with a mantle cloak explicitly designed for that orientation. The procedure is applied to cylinders of radii $0.25{\lambda }_0$ and $0.85{\lambda }_0$, where ${\lambda }_0$ is the design wavelength. The proposed approach’s advantages are highlighted by comparing it with the previously published literature. Additionally, the mantle cloak is realized using a periodic grid of metallic patches, and simulations in Ansys HFSS are performed to verify the design.

Keywords:

• Mantle cloak
• invisibility
• scattering width
• plane waves
• obliqueness
• tilted conditions
• metasurface

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is partially supported by Science and Engineering Research Board (SERB), India with project No. IMP/2018/000043.

Notes on contributors

Vadher Pratik

Vadher Pratik received a B. Tech and M. Tech degrees in RF and Microwave, Department of Electrical Engineering from the Indian Institute of Technology, Kanpur, in 2018. Pratik had been a part of Metamaterials' Lab at IIT Kanpur, where he worked on cloaking techniques to reduce scattering. Pratik's primary interests lie in the field of Antenna Theory, RF design, Metamaterials, and Microelectronics. Pratik is currently working as a Senior Engineer in Honeywell Aerospace, India, where his work focuses presently on Antenna Design, Embedded Systems, and Security.

Mahesh Singh Bisht

Mahesh Singh Bisht received the B. Tech degree in Electronics and Communication Engineering from Uttar-Pradesh Technical University, Lucknow, India in the year 2010, and the M. Tech degree in High-power Microwave Devices and System Engineering, in the year 2013, from the Academy of Scientific and Innovative Research Delhi, under Quick Hire Scientist (QHS) scheme of Council of Scientific and Industrial Research-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, India. Currently, he is pursuing a Doctor of Philosophy (Ph.D.) in RF&Microwaves discipline in the Electrical Engineering department of the Indian Institute of Technology (IIT) Kanpur, India.

Kumar Vaibhav Srivastava

Kumar Vaibhav Srivastava received the B.Tech. degree in Electronics Engineering from Kamla Nehru Institute of Technology, Sultanpur, India, in 2002, and the M.Tech. and Ph.D. degrees both in Electrical Engineering from Indian Institute of Technology (IIT) Kanpur, Kanpur, India, in 2004 and 2008, respectively. He was with the GE Global Research Centre, Bangalore, India, for one year in 2008. In 2009, he joined as an Assistant Professor with the Department of Electrical Engineering, IIT Kanpur, where he is currently serving as a Professor since November 2018. His extensive research interests are microwave antennas, metamaterials, metamaterial absorbers and cloaking, FDTD technique, and MIMO Antennas. He has published more than 102 international journal papers, two international patents and 142 conference papers in last fifteen years. Dr. Srivastava received various national and best paper awards. He has served as Chairperson of IEEE UP Section in 2018 and currently he serving as Executive Committee Member of IEEE India Council since Jan 2019.