Wideband MIMO Antenna Mutual Coupling Reduction with Electromagnetic Band-Gap Structure

Abstract

This communication presents a small size, planar, and two-port wideband multiple-input-multiple-output (MIMO) antenna operating from 2.08 GHz to 5.81 GHz with 94.55% fractional bandwidth. It satisfies the bandwidth requirements of multiple wireless applications in both 5G (sub-6 GHz band) and 4G bands namely Bluetooth (2.4 GHz), LTE (2.5 GHz), WLAN (2.4/5.2/5.8 GHz), and WiMAX (3.5/5.5 GHz). An electromagnetic band-gap (EBG) structure is embedded in the ground plane to reduce the resulting mutual coupling between the antenna elements. As a result, more than 18 dB port isolation is obtained over the entire working band. The important MIMO antenna performance parameters such as envelope correlation coefficient (ECC < 0.05), diversity gain (DG > 9.95 dB), and channel capacity loss (CCL < 0.345 bits/s/Hz) are within the acceptable ranges. Measurement is done on the fabricated antenna. A reasonable agreement is observed between the simulated and measured results.

KEYWORDS:

• EBG structure
• MIMO antenna
• Mutual coupling reduction
• Wideband

Additional information

Notes on contributors

Abdulaziz Dessalew Tadesse

Abdulaziz Dessalew Tadesse received the BSc degree in electrical and computer engineering from Jimma University in 2010, and MSc degree in electronics communication engineering from Addis Ababa University, Addis Ababa Institute of Technology, Ethiopia, in 2016. He has 7 years of teaching experience. Currently, he is working towards his PhD degree in the School of Electronics Engineering, KIIT Deemed to be University, Bhubaneswar, Odisha, India. His research interests include electromagnetics and antennas, especially designing and optimization of millimeter-wave MIMO antenna, and metamaterial/metasurfaces for 5G and cognitive radio applications. Email: [email protected]

Om Prakash Acharya

Om Prakash Acharya received his PhD in electronics and communication engineering from Indian Institute of Technology, Roorkee, India, in 2016. Since 2016, he has been associated with School of Electronics, KIIT Deemed to be University, Bhubaneswar, India, as an assistant professor. Prior to this, he served as an assistant professor at the National Institute of Technology, Puducherry, and National Institute of Technology, Nagaland, India. During 2009–2012, he was a senior research fellow with the Department of Electronics and Communication Engineering, IIT Roorkee. His research interest deals with antenna arrays, array signal processing, MIMO, techniques for performance enhancement of planar antennas, electromagnetics absorber, and application of soft computing techniques in electromagnetics. On these topics, he has published more than 30 technical papers in journals and conferences, co-authored one book chapter on “Particle Swarm Optimization for Antenna Array Synthesis, Diagnosis, and Healing”. Email: [email protected]

Sudhakar Sahu

Sudhakar Sahu is currently working as professor with the School of Electronics Engineering, Kalinga Institute of Industrial Technology (KIIT) Deemed to be University (Institute of Eminence granted by MHRD, Govt. of India), Bhubaneswar, Odisha, India. He received the ME degree in electronics and telecommunication engineering from Indian Institute of Engineering Science and Technology (IIEST) Shibpur, West Bengal, and PhD (Engineering) degree in electronics and telecommunication engineering from Jadavpur University, Kolkata, India. He is the author and co-author of 60 papers in international journals and conference proceedings. He has supervised five doctoral theses. He has successfully completed two Govt. of India funded projects: the one is AICTE, New Delhi, and the other is BRNS-DAE, Mumbai. His research interests include dielectric resonator antenna, MIMO antenna design for cognitive radios, UWB antenna, fractal antenna, microstrip filters, metamaterial/metasurface based microwave components, and application of soft computing techniques in engineering. He is a Senior Member of IEEE AP/MTT Society, Fellow IE (India), Member IET (UK), and Life Member ISTE (New Delhi).