Decoupling and Matching Strategies for Compact Antenna Arrays

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Francisco Estevão Simão Pereira
Josef A. Nossek
F. Rodrigo P. Cavalcanti


This paper proposes and evaluates three strategies of joint decoupling and impedance matching networks (DMN) for antenna arrays. Since MIMO technology presents antenna arrays which can be formatted with elements of the order of tens to hundreds, several effects due to this structure have emerged, such as mutual coupling and impedance matching among antenna elements in array. Therefore, the treatment of these issues seeks to solve problems such as the degradation of the performance of the communications system. The first method called DMN with Lumped Elements (DMN-LE) performs the decoupling and impedance matching steps with capacitors and inductors. The second method is called DMN with Ring Hybrid (DMN-RH). It utilizes a microstrip line in the ring form. With this approach is due achieves first the decoupling followed by impedance matching step. The third method is called Networkless Decoupling and Matching (NDM). It brings a concept of decoupling without the presence of a network itself. This enables modeling an antenna array that performs DMN operations in a simplified and compact manner. A comparison of the methods is performed both
analytically and via computer simulations. We conclude that the third method is promising new alternative approach.

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How to Cite
Pereira, F. E. S., Nossek, J. A., & Cavalcanti, F. R. P. (2020). Decoupling and Matching Strategies for Compact Antenna Arrays. Journal of Communication and Information Systems, 35(1), 290–299.
Regular Papers
Author Biographies

Josef A. Nossek, Department of Teleinformatics Engineering, Federal University of Ceará, Fortaleza, Brazil and Department of Electrical and Computer Engineering, Technical University of Munich, Germany.

Josef A. Nossek (S'72-M'74-SM'81-F'93-LF'13) received the Dipl.-Ing. and Dr. Techn. degrees in electrical engineering from the University of Technology, Vienna, Austria, in 1974 and 1980, respectively, and the Honorary Doctorate degree in 2013. In 1974, he joined Siemens AG, Munich, Germany, as a Member of the Technical Staff, where he became a Supervisor in 1978 and has also been the Head of Department since 1980. In 1987, he was promoted to be the Head of all radio systems design. From 1989 to 2016, he was a Full Professor for circuit theory and signal processing with the Munich University of Technology (TUM). He was the President Elect and the President of the IEEE Circuits and Systems Society in 2001, 2002, and 2003, respectively. He was a Vice President of Verband der Elektrotechnik, Elektronik und Informationstechnik e.V. (VDE) in 2005 and 2006, the President of VDE in 2007 and 2008 and again the Vice President in 2009 and 2010. Since 2016, he has been an Emeritus of Excellence of TUM and a Full Professor with the Federal University of Ceará, Brazil. He was a recipient of the ITG Best Paper Award in 1988, the Mannesmann Mobilfunk (now Vodafone) Innovation Award in 1998, and the Order of Merit of the Federal Republic of Germany in 2008. He received the Award for Excellence in Teaching from the Bavarian Ministry for Science, Research and Art in 1998, the Golden Jubilee Medal for “Outstanding Contributions to the Society” from the IEEE Circuits and Systems Society in 1999, the Education Award from the IEEE Circuits and Systems Society in 2008, and the Ring of Honor from VDE in 2014. He was an elected member of the German National Academy of Engineering Sciences (acatech) in 2009.

F. Rodrigo P. Cavalcanti, Wireless Telecommunications Research Group (GTEL), Departament of Teleinformatics Engineering, Federal University of Ceará, Brazil

F. Rodrigo P. Cavalcanti received the D.Sc. degree in Electrical Engineering from the State University of Campinas, São Paulo, Brazil, in 1999. Upon graduation, he joined the Federal University of Ceará (UFC), where he is currently an Full Professor and holds the Wireless Communications Chair at the Department of Teleinformatics Engineering. In 2000, he founded, and since then has directed, the Wireless Telecom Research Group (GTEL), which is a research laboratory based on Fortaleza, Brazil, which focuses on the advancement of wireless telecommunications technologies. At GTEL, he manages a 19-year long program of research projects in wireless communications sponsored by Ericsson Research. In 2017 he was a visiting researcher to Ericsson as main site at Stockholm, Sweden. Prof. Cavalcanti has produced a varied body of work including books, papers, patents and software dealing with wireless access networks and technologies. Prof. Cavalcanti is a distinguished researcher of the Brazilian Scientific and Technological Development Council for his technology development and innovation record. He also holds a Leadership and Management professional certificate from the Massachusetts Institute of Technology, Cambridge, USA.