Mutual Coupling Reduction in Patch Antenna Array Based on EBG Structure for MIMO Applications

  • Yahiea Alnaiemy Department of Broadband Infocommunications and Electromagnetic Theory, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, H-1521 Budapest, P.O.B. 91, Hungary; Department of Computer Science, College of Science, University of Diyala, 32014 Khan Bani Sa`Ad, post code 2, Diyala, Iraq
  • Taha A. Elwi Department of Communication Engineering, Al-Ma’mun University College, 14th Ramadan Street, Al-Mansur, Baghdad, Iraq
  • Lajos Nagy Department of Broadband Infocommunications and Electromagnetic Theory, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, H-1521 Budapest, P.O.B. 91, Hungary

Abstract

This paper presents a printed rectangular slot microstrip antenna array of two elements based on an Electromagnetic Band Gap (EBG) structure. The proposed EBG structure is invented to improve the isolation between the radiating elements for multiple-input multiple-output (MIMO) application. Single and two slotted rectangular microstrip antennas are designed on an FR-4 substrate with a dielectric constant (εr) of 4.3 and loss tangent (tanδ) of 0.025 with thickness of 1.6 mm. The proposed EBG structure is designed as one planar row of 24 slots. The proposed array performance is tested numerically using Computer Simulation Technology Microwave Studio (CSTMW) of Finite Integration Technique (FIT) formulations. The antenna performance in terms of reflection coefficient (S11), isolation coefficient (S21), radiation patterns, boresight gain and Envelope Correlation Coefficient (ECC) are investigated before and after introducing the EBG structure to identify the significant enhancements. The proposed EBG structure is located between the radiating antenna elements to reduce the mutual coupling of the proposed antenna array. The edge to edge separation distance of the proposed antennas is λ0/16, where the λ0 is the free space wavelength at 2.45 GHz. The simulated results show a significant isolation enhancement from –6 dB to –29 dB at the first resonant frequency 2.45 GHz and from –10 dB to –25 dB at the second resonant frequency 5.8 GHz after introducing the EBG structure to the antenna array.

Keywords: antenna array, EBG, mutual coupling, MIMO
Published online
2019-10-10
How to Cite
Alnaiemy, Y., Elwi, T. and Nagy, L. “Mutual Coupling Reduction in Patch Antenna Array Based on EBG Structure for MIMO Applications”, Periodica Polytechnica Electrical Engineering and Computer Science. doi: https://doi.org/10.3311/PPee.14379.
Section
Articles