https://orcid.org/0000-0003-0282-2916
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Abstract
A simple meta-material unit cell with a negative permittivity in the X band is designed in this work. This meta-material cell is a one-sided cell which is simulated to extract scattering parameters, permittivity and permeability. Four different unit cells were examined and simulated to achieve the final structure. The effects of mutual-coupling of unit cells on structural performance were also investigated. Finally, a 7*7 array was constructed from these unit cells. The measurement and simulation results were acceptably consistent. The results show that this structure has a negative refractive index in the frequency range of 9.2–11.7 GHz.
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Notes on contributors
O. Borazjani
Omid Borazjani received his BS and MS degree in electrical telecommunication from Islamic Azad University of Bushehr in 2006 and 2009. Now he is a PhD student of Science & Research Branch, Islamic Azad University, Tehran. He has been as a senior researcher and lecturer in Islamic Azad University of Bushehr from 2009. His research interests are microstrip antenna design, microwave passive and active circuits, RF MEMS. Email: [email protected]
M. Naser Moghadasi
Mohammad Naser-Moghadasi was born in Saveh, Iran, in 1959. He received the BSc degree in communication engineering in 1985 from Leeds Metropolitan University (formerly Leeds Polytechnic), UK. Between 1985 and 1987 he worked as an RF design engineer for the Gigatech Company in Newcastle Upon Tyne, UK. From 1987 to 1989, he was awarded a full scholarship by the Leeds Educational Authority to pursue an MPhil studying in CAD of Microwave Circuits. He received his PhD in 1993, from the University of Bradford, UK. He was offered then a 2years Post Doc, to pursue research on Microwave Cooking of Materials at the University of Nottingham, UK. From 1995, he joined Islamic Azad University, at Science & Research Branch, Iran, where currently he is an associate professor and head of Telecommunications group. His main areas of interest in research are microstrip antenna, microwave passive and active circuits, RF MEMS. He is a member of the Institution of Engineering and Technology, MIET, and the Institute of Electronics, Information and Communication Engineers (IEICE). He has so far published over 160 papers in different journals and conferences. Email: [email protected]
J. Rashed Mohassel
Jalil Rashed-Mohassel Received his MSc in electrical engineering from University of Tehran in 1976 and his PhD degree in electrical engineering from University of Michigan, Ann Arbor in 1982. Formerly he was with the University of Sistan and Baluchestan, Zahedan, Iran. His research interests include antennas, EM theory and EMC/EMI. In 1994 he joined the University of Tehran where he is doing teaching and research as a professor in the School of ECE. He is the author of three books and has published more than 200 papers in refereed journals and conference proceedings. He is a principal member of the Center of Excellence on Applied Electromagnetic Systems (CEAES), and the director of the microwave laboratory. He is a life senior member of IEEE, distinguished professor of the 1st Education Festival (2008- 2009), University of Tehran, Recipient of the First National “Jabehdar” Prize in Education from IEEE, Iran Section, 2014, distinguished professor of Electrical Engineering, The Academy of Sciences, I R Iran, 2015, distinguished Educator and Researcher, in the 4th National Communication and Information Technology Festival, Ministry of ICT, 2014 and the IAEEE Brilliant National Researcher in the 5th “Founder's of Science and Technology” Festival, 2007.
R. A. Sadeghzadeh
Ramazanali Sadeghzadeh received the BSc degree in telecommunication engineering from KN Toosi University of Technology, Tehran, Iran, in 1984, the MSc in digital communication engineering from the University of Bradford, Bradford, UK, and University of Manchester Institute of Science and Technology (UMIST), Manchester, UK, as a joint program in 1987, and the PhD degree in electromagnetic and antenna from the University of Bradford in 1991. During 1992–1997, he worked as a postdoctoral research assistant in the field of propagation, electromagnetic, antenna, biomedical, and wireless communication at the University of Bradford. From 1984 to 1985, he was with Iran Telecommunication Company, Tehran, Iran, working on networking. Since 1997, he has been with the Faculty of Electrical and Computer Engineering, KN Toosi University of Technology. He has published over 120 referable papers in international journals and conferences. His research interests include numerical techniques in electromagnetics, antenna, propagation, radio networks, wireless communications, nano antennas, and radar systems. Email: [email protected]