A helical shaped broadband circularly polarized dielectric resonator antenna

Abstract

By modifying the shape of a rectangular dielectric resonator antenna (DRA), a wideband circularly polarized (CP) radiator is introduced. The modified structure is composed of two L-shaped dielectric pieces stacked onto each other. The resulting geometry is similar to a two-turn helix with a rectangular cross section. Placing a coaxial probe adjacent to the sidewall of the DRA excites multiple orthogonal modes in the antenna which in sequence leads to a wideband CP DRA. The special geometry of the DRA provides the required quadrature phase difference between the orthogonal components of the electric fields. The measured input scattering parameter, $|S_{11}|$, is below −10 dB from 3 to 4.6 GHz (42%). Also, the frequency band in which axial ratio (AR) is lower than 3 dB extends from 3.1 to 3.83 GHz (21.07%), which is suitable for WIMAX applications. The measured results of the fabricated prototype are presented to verify the simulations.

Keywords:

• Circularly polarized
• dielectric resonator antenna
• Wideband response

Disclosure statement

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

Additional information

Funding

This work was supported by Iran Telecommunication Research Center.

Notes on contributors

Saeed Fakhte

Saeed Fakhte was born in Guilan Province, Iran. He received the Ph.D. degree in electrical engineering from the Iran University of Science and Technology, Tehran, Iran, in 2017. His research interests are in various areas of microwave and antenna engineering, such as dielectric resonator antennas and microstrip antennas. He is currently an Assistant Professor with the Department of Electrical and Computer Engineering, Qom University of Technology (QUT), Qom, Iran.

Iman Aryanian

Iman Aryanian was born in Iran in 1986. He received the B.Sc. degree in electrical engineering, and the M.Sc. and Ph.D. degrees in electrical communication engineering in 2008, 2010, and 2016, respectively, from the Amirkabir University of Technology, Tehran, Iran. He is currently an Assistant Professor with the Iran Telecommunication Research Center, Tehran. His research interests are in the areas of the reflectarray antenna, computational electromagnetic, semiconductor RF modeling, electromagnetic theory, and computational electromagnetics.

Ladislau Matekovits

Ladislau Matekovits (M'94-SM'11) received the degree in electronic engineering from Institutul Politehnic din Bucure?ti, Bucure?ti, Romania, and the Ph.D. degree (Dottorato di Ricerca) in electronic engineering from Politecnico di Torino, Torino, Italy, in 1992 and 1995, respectively. Since 1995, he has been with the Department of Electronics and Telecommunications, Politecnico di Torino, first with a post-doctoral fellowship, then as a Research Assistant. He joined the same Department as Assistant Professor in 2002 and was appointed as Senior Assistant Professor in 2005 and as Associate Professor in 2014 respectively. In February 2017 he obtained the Full Professor qualification (Italy). In late 2005, he was Visiting Scientist at the Antennas and Scattering Department, FGAN-FHR (now Fraunhofer Institute), Wachtberg, Germany. Beginning July 1, 2009, for two years he has been a Marie Curie Fellow at Macquarie University, Sydney, NSW, Australia, where in 2013 he also held a Visiting Academic position and in 2014 has been appointed as Honorary Fellow. His main research activities concern numerical analysis of printed antennas and in particular development of new, numerically efficient full-wave techniques to analyze large arrays, optimization techniques and active and passive metamaterials for cloaking applications. Material parameter retrieval of these structures by inverse methods and different optimization techniques have also been considered. In the last years, bio-electromagnetic aspects have also been contemplated, as for example design of implantable antennas or development of nano-antennas for example for drug delivery applications. He has published 350+ papers, including 75+ journal contributions, and delivered seminars on these topics all around the world: Europe, USA (AFRL/MIT-Boston), Australia, China and Russia. Prof. Matekovits has been invited to serve as Research Grant Assessor for government funding calls (Romania, Italy, Croatia) and as International Expert in PhD thesis evaluation by several Universities from Australia, India, Pakistan, Spain, etc. Prof. Matekovits has been a recipient of various awards in international conferences, including the 1998 URSI Young Scientist Award (Thessaloniki, Greece), the Barzilai Award 1998 (young Scientist Award, granted every two years by the Italian National Electromagnetic Group), and the Best AP2000 Oral Paper on Antennas, ESA-EUREL Millennium Conference on Antennas and Propagation (Davos, Switzerland). He is recipient of the Motohisa Kanda Award 2019: for the most cited paper of the IEEE Transactions on EMC in the past five years. He has been Assistant Chairman and Publication Chairman of the European Microwave Week 2002 (Milan, Italy), and General Chair of the 11th International Conference on Body Area Networks (BodyNets) 2016. Since 2010 he is member of the organizing committee of the International Conference on Electromagnetics in Advanced Applications (ICEAA) and he is member of the technical program committees of several conferences. He serves as Associated Editor of the IEEE ACCESS, IEEE Antennas and Wireless Propagation Letters and IET MAP and reviewer for different journals.