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ABSTRACT
An approach for improving the invisibility performance of mantle cloak is proposed. It is based on an interesting observation that the cloaking performance of mantle cloak can be significantly enhanced if the cloak is operated under tilted conditions with respect to the incident radiation (such that the wave is incident obliquely onto the cloak). The mantle cloak is thus designed by judiciously choosing the value of surface impedance corresponding to the tilt angle. It is because the optimum value of surface impedance changes with the tilt angle. An analytical method is devised for the calculation of optimum surface impedance under tilted conditions and subsequently verified with Ansys HFSS simulations. It is also shown that by deliberately tilting the mantle cloak, numerous advantages over normal incidence scenario, are obtained, such as (a) significant reduction in total scattering width, (b) considerable enhancement in bandwidth, and (c) increase in performance robustness with respect to the dispersion of surface impedance. These advantages of operating under tilted conditions are well elucidated by comparing it with that for normal incidence scenario previously presented in various literatures. The metasurface cloak is subsequently realized using I-shaped unit cell structure and varactor diodes, and cloaking performance is analyzed using HFSS simulations.
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Notes on contributors
M. S. Bisht
M. S. Bisht received the BTech 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.
Vadher Pratik Vinubhai
Vadher Pratik Vinubhai received a BTech and MTech 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.
Kumar Vaibhav Srivastava
Kumar Vaibhav Srivastava received the BTech. degree in Electronics Engineering from Kamla Nehru Institute of Technology, Sultanpur, India, in 2002, and the MTech and PhD 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 January 2019.