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Abstract
A new reconfigurable band-notched ultra-wideband (UWB) dielectric resonator antenna (DRA) has been designed and fabricated for cognitive radio (CR) applications. The UWB antenna design comprises a dielectric resonator as a radiation element, a ground plane, and a microstrip feed line. The frequency band’s rejection mechanism is achieved by cutting two slots and adding an L-shaped stub on the ground plane. The reconfigurable function is created by PIN diode switches to change the current distribution path on the ground plane. A preliminary model of the DRA was fabricated, and its efficiency was verified. The proposed antenna occupies an area of 40 × 40 × 7.3 mm. The simulated and measured results have demonstrated suitable radiation patterns attained by the proposed antenna, which operates within the UWB frequency range of 3–11 GHz. Moreover, the antenna has shown an ability by rejecting switchable bands to achieve the WiMAX (3.2–3.65 GHz), WLAN 5 GHz (4.8–6 GHz), and ITU 8 GHz (8–8.3 GHz). Also, this antenna can be operated as dual and triple band-notched antennas.
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Notes on contributors
Mehdi Abioghli
Mehdi Abioghli was born in Meshkin Shahr, Iran in 1982. He received the MSc degree in communication engineering from Tabriz University, Tabriz, Iran in 2009. He is currently working towards the PhD degree at Science and Research Branch, Islamic Azad University, Tehran, Iran. His current research interests include electromagnetics and compact antenna design and analysis. Email: [email protected]
Asghar Keshtkar
Asghar Keshtkar was born in Ardabil, Iran in 1962. He received the BSc degree in electrical engineering from Tehran University, Tehran, Iran, the MSc degree in electrical engineering from the University of Khaje-Nasir, Tehran, and the PhD degree in electrical engineering from the Iran University of Science and Technology, Tehran, in 1989, 1992, and 1999, respectively. He is currently a professor with the Faculty of Engineering and Technology, Imam Khomeini International University (IKIU), Ghazvin, Iran. His current research interests include electromagnetics, bioelectromagnetics, and antennas. Corresponding author. Email: [email protected]
Mohammad Naser-Moghadasi
M Naser-Moghadasi was born in Saveh, Iran in 1959. He received the BSc degree in communication engineering in 1985 from the Leeds Metropolitan University (formerly Leeds Polytechnic), UK. Between 1985 and 1987, he worked as an RF design engineer for the Gigantic 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 2 years’ Postdoc. to pursue research on microwave cooking of materials at the University of Nottingham, UK. From 1995, he joined Islamic Azad University, Science & Research Branch, Iran, where he currently is an associate professor and head of Telecommunication Group. His main areas of interest in research are microstrip antenna, microwave passive and active circuits, RF MEMS. He is 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]
Behbod Ghalamkari
Behbod Ghalamkari was born in Tehran, Iran on 5 December 1981. He received MSc and PhD degrees from the Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran, both in electrical engineering, in 2007 and 2013, respectively. In 2015, he joined Islamic Azad University, Science and Research Branch, Tehran Iran, where he currently is an assistant professor with the Department of Electrical and Computer Engineering. His main interest lies in the scattering and inverse scattering in electromagnetic problems, antenna design and active microwave circuits. He won the E Engineering Prize Paper Award at the 2014 ICEE Iranian Conference. Email: [email protected]