Five-port MIMO antenna for n79-5G band with improved isolation by diversity and decoupling techniques

Abstract

A compact five-port multi-input multi-output (MIMO) antenna for n79 (4.4–5 GHz) 5G band exhibiting pattern and polarization diversity with good isolation is proposed in this paper. This MIMO antenna system comprises of four linearly polarized (LP) endfire monopole antenna elements and one broadside L-shaped slot circularly polarized (CP) antenna element, which provides both pattern and polarization diversity. A T-shaped slot as a decoupling structure is further used to improve the interport isolation by 4 dB. The return loss bandwidth for all antenna elements is in the desired frequency range, and antenna elements provide isolation better than 23 dB. The pattern and polarization diversity provide a low envelope correlation coefficient and good isolation between any two-port of the MIMO antenna. For experimental verification, the proposed 5-port MIMO antenna system is fabricated and measured, which provides decent agreement with the simulated performance.

KEYWORDS:

• 5-port MIMO antenna
• circularly polarized L-shaped slot antenna
• pattern and polarization diversity
• decoupling technique

Disclosure statement

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

Additional information

Notes on contributors

Rahul Kumar Jaiswal

Rahul Kumar Jaiswal received the B.Tech degree in Electronics and Communication Engineering from Uttar-Pradesh Technical University, Lucknow, India, in the year 2012. He has worked as a Project Trainee in Society for Applied Microwave Electronics Engineering and Research (SAMEER) Kolkata in 2015–16. He has completed the M. Tech degree in Microwave Electronics in the year 2016 from the University of Delhi South Campus, Delhi, India. He also worked as a Project Engineer in Institute for Plasma Research (IPR) Gandhinagar, India, in 2016–17. Currently, he is pursuing a Doctor of Philosophy (PhD) in RF & Microwaves discipline in the Electrical Engineering department of the Indian Institute of Technology (IIT) Kanpur, India.

Kahani Kumari

Kahani Kumari received the B.Tech degree in Electronics and Communication Engineering from West Bengal University of Technology, Kolkata, India, in the year 2012, and the ME degree in Microwave Communication in the year 2015 from Indian Institute of Engineering Science and Technology, Shibpur, India. Currently, she is pursuing a Doctor of Philosophy (PhD) in RF & Microwaves discipline in the Electrical Engineering department of the Indian Institute of Technology (IIT) Kanpur, India.

Anuj Kumar Ojha

Anuj Kumar Ojha received his PhD degree at the Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science, BITS Pilani, (Pilani campus), Rajasthan, India in 2020. His thesis was on the Performance Enhancement of Cylindrical Dielectric Resonator Antennas for Low Cross Polarization and High Gain Applications. He received his M. Tech degree in digital communication from Rajasthan Technical University (RTU), Kota Rajasthan in 2013. He served the MEMS group at CSIR-CEERI Pilani, Rajasthan as the project fellow from 2013 to 2015, where he worked on the development of silicon-based MEMS piezoresistive pressure sensors for various applications. He has published several journal / conference papers on various aspects of MEMS sensors, dielectric resonator antennas and RF sensors. Presently, he is working as Research Associate in the department of the Electrical Engineering at Indian Institute of Technology Kanpur Uttar Pradesh India. His research interests include dielectric resonator antennas, higher order mode antennas, sensors, filtering antennas, Metamaterial absorbers, MIMO antennas.

Kumar Vaibhav Srivastava

Kumar Vaibhav Srivastava received the B.Tech degree in Electronics Engineering from Kamla Nehru Institute of Technology, Sultanpur, India, in 2002, and the M. Tech and PhD degrees both in Electrical Engineering from Indian Institute of Technology (IIT) Kanpur, Kanpur, India, in 2004 and 2008, respectively. He was with the GE Global Research Centre, Bangalore, India, for one year in 2008. In 2009, he joined as an Assistant Professor with the Department of Electrical Engineering, IIT Kanpur, where he is currently serving as a Professor since November 2018. His extensive research interests are microwave antennas, metamaterials, metamaterial absorbers and cloaking, FDTD technique, and MIMO Antennas. He has published more than 115 international journal papers, two international patents and 150 conference papers in the last fifteen years. Dr. Srivastava received various national and best paper awards. He was Chairperson of IEEE UP Section in 2018 and founding Chair of IEEE Antenna and Propagation Society Chapter in UP Section.