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ABSTRACT
In this paper, a proposal of a four-port antenna for MIMO applications is presented with high interport isolation. The isolation among elements is implemented by limiting the surface current distribution of each radiator by placing them on different substrate layers, leading to a size optimization. The array is implemented by four drop-shaped slot radiators. The antenna performs from 1.7 to 7.2 GHz, presents a very low Envelope Correlation Coefficient (ECC), reaching values of 0.0025 tops, and a stable Total Active Reflection Coefficient (TARC) over the entire operational bandwidth. These parameters demonstrate the feasibility of the antenna for MIMO systems. The peak average gain is 5 dB, and the port isolation between adjacent radiators, S12 and S14, and opposite radiators, S13 and S24 are below −20 dB, reaching values even less than −30 dB in some bands without adding extra structures, avoiding an increment in the total area.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
José Alfredo Tirado-Méndez
José Alfredo Tirado-Méndez Tirado-Mendez was born in Mexico City, Mexico. He received the BS degree in Electronics and Digital Systems from UAMAzcapotzalco in 1999, and the MSc and PhD (with honors) degrees in Electrical Engineering from CINVESTAV in 2001 and 2008, respectively. In 2002 he joined the Telecommunications Section at the CINVESTAV. In 2011, he joined the Postgraduate Studies and Research Section of the National Polytechnique Institute, as a full professor. His research interests are electromagnetic compatibility, high-frequency electronics, nonlinear RF and microwave systems, antennas and metamaterials. He is member of the SNI in Mexico. He has written more than 50 JCR indexed articles and proceeding papers, and directed more than 20 undergraduate and 10 graduate theses.
Hildeberto Jardón-Aguilar
Hildeberto Jardón-Aguilar was born in Tenancingo, Hidalgo, Mexico. He received the BS degree in Electronics Engineering from ESIME-IPN, and the PhD degree in Radiosystems from the Moscow Technical University of Telecommunications and Informatics. Since 1985, he is currently working as Full Professor at the Research and Advanced Studies Center. His research interests include analysis of nonlinearities in RF and microwave circuits, Electromagnetic Compatibility and Photonic Systems. He is author of 5 books and more than 100 technical papers in journals and symposiums. He is a member of the Popov Society and he has level III in the SNI of Mexico.
Arturo Rangel-Merino
Arturo Rangel-Merino has received the Bachelor Degree in Telecommunications and Electronics Engineering in 1981 from the School of Mechanical and Electrical Engineering (ESIME) of the National Polytechnic Institute of Mexico (IPN), the Master in Science degree in Automatic Control by the Center for Research and Advanced Studies of IPN in 2001 and the PhD degree in Telecommunications and Electronics by the Section of Graduate Studies and Research (SEPI) of the National Polytechnique Institute in 2013.
Luis Alberto Vasquez-Toledo
Luis Alberto Vasquez-Toledo was born in Juchitan Oaxaca, Mexico, in November 1985. He received the BSc degree in electronics and communications engineering in 2008 and the MSc and PhD degrees in electrical engineering from the Center for Research Advanced Studies (CINVESTAV-IPN), Mexico City. He is a Professor at the UAM-Iztapalapa, Mexico, since 2018. His research interest includes, but is not limited to, performance evaluation, teletraffic analysis, resource management of wireless mobile communications networks and data transmission in cellular networks and wireless sensor networks.
Ricardo Gómez-Villanueva
Ricardo Gómez-Villanueva obtained the BSc in Electronics in 1992 from the Metropolitan Autonomous University (UAM), and the MSc degree in Electrical Engineering in 1995 from the Center for Research and Advanced Studies (CINVESTAV) in Mexico City. In 1996 he joined Grupo Iusacell, a Mexican mobile phone operator, where he was involved in several projects, including the planning of the 3G CDMA mobile phone platform of Iusacell. In 2016 he received the Sc.D. degree from the Superior School of Mechanical and Electrical Engineering (ESIME) of the National Polytechnic Institute (IPN), Mexico. Dr Gómez is currently an assistant researcher at CINVESTAV where his main research interests are ultra-wide band and MIMO antennas.