Dual-sense slot-based CP MIMO antenna with polarization bandwidth reconfigurability

Niamat Hussain; Khaled Aljaloud; Rifaqat Hussain; Ali H Alqahtani; Zia Ullah Khan; Farooq A Tahir; Qammer H Abbasi

doi:10.1038/s41598-023-42569-1

Dual-sense slot-based CP MIMO antenna with polarization bandwidth reconfigurability

Sci Rep. 2023 Sep 26;13(1):16132. doi: 10.1038/s41598-023-42569-1.

Authors

Niamat Hussain^#¹, Khaled Aljaloud^#², Rifaqat Hussain³, Ali H Alqahtani², Zia Ullah Khan⁴, Farooq A Tahir⁵, Qammer H Abbasi⁶

Affiliations

¹ Department of Intelligent Mechatronics Engineering, Sejong University, Seoul, Korea.
² College of Engineering, Muzahimiyah Branch, King Saud University, P.O. Box 2454, Riyadh, 11451, Saudi Arabia.
³ Antenna and Electromagnetics Research Group, School of Electronic Engineering and Computer Science, Queen Mary University of London, London, UK. rifaqat.hussain@qmul.ac.uk.
⁴ Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, UK.
⁵ James Watt School of Engineering, University of Glasgow, Glasgow, UK. farooq.tahir@glasgow.ac.uk.
⁶ James Watt School of Engineering, University of Glasgow, Glasgow, UK. qammer.abbasi@glasgow.ac.uk.

^# Contributed equally.

Abstract

In this letter, a compact, planar circularly polarized (CP) sub-GHz slot-based multiple-input-multiple-output (MIMO) antenna with dual sense CP along with polarization bandwidth reconfigurability is presented. The pentagonal reactively loaded slot is fed by two folded tapered feedlines to achieve CP. The antenna offers left-hand-circular polarization (RHCP) with the as well as right hand circular polarization (LHCP). The antenna exhibit linearly polarization (LP) by exciting two ports simultaneously. Moreover, the antenna CP resonance can be reconfigured by varying the capacitance of the varactor diode. The antenna has a wide -10 dB operating frequency band from 578-929 MHz. while the axial ratio (AR) bandwidth ranges from 490-810 MHz. Moreover, the two elements MIMO are optimized and placed on compact dimensions 100 × 100 × 0.76 mm³ to realize pattern diversity. The antenna's key characteristics are compact size, wide-band sub-GHz operation, dual sense CP, polarization bandwidth reconfigurability and good MIMO performance. Thus, it is a suitable candidate to be utilized in CubeSats applications in sub-GHz bands.