A Dual Port Hybrid Super-wideband MIMO Antenna with Diminished CCL and High BDR for IoT Applications

Abstract

In this work, a simple hybrid dual port skull-shaped super wideband Multiple Input Multiple Output (MIMO) antenna with improved isolation is designed and analyzed. Each antenna element consists of a skull-shaped radiator along with a rectangular notched chamfered Defective Ground Plane structure (DGS). The proposed antenna’s impedance bandwidth and radiation characteristics are improved by the triple elliptical inclined slot and DGS together. To accomplish the proposed MIMO configuration, the antenna elements are further organized in a linear arrangement. Deteriorated isolation characteristics, which are the key bottleneck for such MIMO schemes, are significantly improved in the proposed design by using a corrugated T-shaped strip decoupling plane. This 2-port MIMO antenna is placed on top of a glass epoxy FR4 substrate and has an overall dimension of 45 × 50 × 0.787 mm³ (0.20λ × 0.19λ × 0.003λ). The proposed MIMO antenna is fabricated and the experimental results are verified with the simulation results. The results indicate that the proposed antenna covers an operational bandwidth of 48.75 GHz (1.25–50 GHz) with a fractional bandwidth of 190.24% and offers an isolation of less than −20 dB throughout the frequency range of operation. The proposed MIMO has an extremely high bandwidth dimension ratio (BDR) of 5092 among the reported antennas. An optimal performance has been achieved with a lower value of Envelope Correlation Coefficient (ECC) ≤ 0.02, high multiplexing efficiency, extremely lower Channel Capacity Loss (CCL) of 0.2, and omnidirectional radiation characteristics. These design metrics show the potential of our antenna to operate for eMBB (Enhanced Mobile Broadband) applications which includes 5G, Augmented reality, and etc.

Keywords:

• Bandwidth dimension ratio (BDR)
• Channel capacity loss (CCL)
• Envelope correlation coefficient (ECC)
• Isolation
• Multiple input multiple output (MIMO)
• Super wideband
• Corrugated T-shaped decoupling plane

Disclosure statement

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

Additional information

Funding

The authors acknowledge the support of “Science and Engineering Research Board (SERB)”, Department of Science and Technology (DST), Government of India, under project No. ECR/2017/003341. Authors thank the CARE Department of IIT Delhi for providing the measurement facility.

Notes on contributors

Ayyappan M

Ayyappan M (graduate student member, IEEE) received the Bachelor of Technology (BTech) degree in electronics and communication engineering from Cochin University of Science and Technology, Kerala, India in 2014, and the Master of Technology (MTech) degree in VLSI and Embedded systems from the Same University in 2016. He is currently pursuing the PhD degree in electronics and communication engineering at National Institute of Technology, Goa, India. His research interests include super wideband antennas, multiple-input multiple-output antennas and dielectric resonator antennas. Email: [email protected]

Pragati Patel

Pragati Patel (Senior Member, IEEE) received the BTech degree from the Dr K N Modi Institute of Engineering and Technology, Modinagar, Ghaziabad, India, the MTech degree from the Ambedkar Institute of Advanced Communication Technologies and Research (formerly Ambedkar Institute of Technology), Delhi, and the PhD degree from the Indian Institute of Technology Bombay, Mumbai, India. In 2016, she joined the Department of Electronics and Communication Engineering, National Institute of Technology Goa, India, as an assistant professor. She has authored or co-authored over 40 research articles in international peer-reviewed journals and conferences. Her current research interests include dielectric resonators, microstrip patch antennas, and MIC. She received the MHRD fellowship during her PhD degree and also the Early Career fellowship from the Department of Science and Technology, Government of India, for pursuing research in the field of DRA. She was a recipient of the Young Scientist Award at URSIAT-RASC 2015. She actively involved in IEEE activities as a secretary for educational activities of IEEE Bombay Section. Email: [email protected]

Hemant Kumar

Hemant Kumar (S’16-M’18-SM’21 IEEE, M’20 IETE) received his BTech (with honors) degree in electronics and communication engineering from Kurukshetra University and a PhD in electrical engineering from the Indian Institute of Technology Bombay. Currently, he is working as an assistant professor at NIT Tiruchirappalli. His research interests include broadband antennas, microstrip antennas and arrays, passive microwave circuits, monopulse tracking, microwave imaging, and machine learning in antennas and microwaves. He is also serving as one of the editors in IETE Journal of Research and a reviewer in several national/international journals including IEEE Access, IET Microwave Antennas & Propagation, IETE, etc. He has published many research articles in refereed journals and refereed conference proceedings, and also filed for one patent and copyright. Corresponding author. Email: [email protected]