Design and optimization of a novel miniaturized low-profile circularly polarized wide-slot antenna

ABSTRACT

This paper presents a novel structure of a compact circularly polarized (CP) antenna. CP is obtained using a parasitic quasi-rectangular strip placed coplanar to the feedline. A ground plane perturbation combined with the asymmetric geometry of the coplanar waveguide ground planes is utilized to excite additional CP modes. All antenna dimensions are rigorously optimized to achieve the best possible performance in terms of the impedance and axial ratio bandwidth (ARBW). The size of the proposed antenna is only 24.7 × 25 mm². The antenna performance is validated experimentally. A close agreement between simulation and experimental results is observed. A wide impedance bandwidth of 42.6% (3.93–6.06 GHz) and ARBW of 42% (3.96–6.03 GHz) is with 98.5% bandwidth overlap between |S11| and AR is achieved. The average realized gain of the antenna throughout the operating frequency is 3.4 dBic. Left-hand circular polarization radiation is achieved in the +z-direction. .

KEYWORDS:

• Circularly polarized antennas
• compact antennas
• wide-slot antennas
• axial ratio
• wideband operation
• EM-driven design

Acknowledgement

The authors would like to thank Dassault Systemes, France, for making CST Microwave Studio available.

Disclosure statement

No potential conflict of interest was reported by the authors

Additional information

Funding

This work was supported in part by the Icelandic Centre for Research (RANNIS) [Grant no.no174114051] and by the National Science Centre of Poland [Grant no.2014/15/B/ST7/04683].

Notes on contributors

Ubaid Ullah

Ubaid Ullah received the M.Sc. and Ph.D. degrees in electrical and electronic engineering from Universiti Sains Malaysia, Malaysia in 2013 and 2017, respectively. His research interest includes circular polarization, wideband antennas, and dielectric resonator type microwave structures for antenna, CAD modeling of microwave and antenna structures, simulation-driven design, and surrogate-based optimization. He is currently working with the School of Science and Engineering, Reykjavik University, Iceland.

Slawomir Koziel

Slawomir Koziel received the M.Sc. and Ph.D. degrees in electronic engineering from Gdansk University of Technology, Poland, in 1995 and 2000, respectively. He also received the M.Sc. degrees in theoretical physics and in mathematics, in 2000 and 2002, respectively, as well as the PhD in mathematics in 2003, from the University of Gdansk, Poland. He is currently a Professor with the School of Science and Engineering, Reykjavik University, Iceland. His research interests include CAD and modeling of microwave and antenna structures, simulation-driven design, surrogate-based optimization, space mapping, circuit theory, analog signal processing, evolutionary computation and numerical analysis.