Sachin Kumar received a B.Tech. degree in electronics and communication engineering from Uttar Pradesh Technical University, Lucknow, India, in 2009, and M.Tech. and Ph.D. degrees in electronics and communication engineering from Guru Gobind Singh Indraprastha University, Delhi, India, in 2011 and 2016, respectively. He worked as a postdoctoral researcher with the School of Electronic and Electrical Engineering, Kyungpook National University, Daegu, Republic of Korea, and as a research assistant professor with the Department of Electronics and Communication Engineering, SRM Institute of Science and Technology, Kattankulathur 603203, India. He is currently working as a professor with the Department of Electronics and Communication Engineering, Galgotias College of Engineering and Technology, Greater Noida 201310, India. His research interests include circularly-polarized microstrip antennas, reconfigurable antennas, ultra-wideband antennas, defected ground structure, and microwave components.