A Transmission-Line-Based Decoupling Method for MIMO Antenna Arrays

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Abstract

A transmission-line-based decoupling technique for dual-polarized multiple-input and multiple-output (MIMO) antenna arrays is presented and analyzed. The proposed scheme enables well-canceled coupling for the adjacent elements under co-polarization, without degrading the isolation of the cross-polarized ports. Firstly, a decoupling network based on the presented method for a 2×2 MIMO array is provided, along with a comprehensive design procedure. Calculations and simulations are operated to verify the decoupling performance. For further verification, a 2×2 dual-polarized patch array with the proposed decoupling method is developed. The decoupling network characterizes low profile, compact size, and low insertion loss, which is realized in a single layer. Measurements denote that the isolations between the co-polarized elements are improved from 16-20 dB to over 30 dB after decoupling at the center frequency of 2.45 GHz. Subsequently, based on the proposed 2×2 decoupling method, a decoupling network for large-scale dual-polarized MIMO arrays is presented. A design example of a 4×4 dual-polarized patch antenna array is established. Full-wave simulations indicate that the isolations are enhanced to better than 30 dB with a small insertion loss of less than 0.45 dB, and can widely be used for phased array and massive MIMO array systems.
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A transmission-line-based decoupling technique for dual-polarized multiple-input and multiple-output (MIMO) antenna arrays is presented and analyzed. The proposed scheme enables well-canceled coupling for the adjacent elements under co-polarization, without degrading the isolation of the cross-polarized ports. Firstly, a decoupling network based on the presented method for a 2×2 MIMO array is provided, along with a comprehensive design procedure. Calculations and simulations are operated to verify the decoupling performance. For further verification, a 2×2 dual-polarized patch array with the proposed decoupling method is developed. The decoupling network characterizes low profile, compact size, and low insertion loss, which is realized in a single layer. Measurements denote that the isolations between the co-polarized elements are improved from 16-20 dB to over 30 dB after decoupling at the center frequency of 2.45 GHz. Subsequently, based on the proposed 2×2 decoupling method, a decoupling network for large-scale dual-polarized MIMO arrays is presented. A design example of a 4×4 dual-polarized patch antenna array is established. Full-wave simulations indicate that the isolations are enhanced to better than 30 dB with a small insertion loss of less than 0.45 dB, and can widely be used for phased array and massive MIMO array systems.
Original languageEnglish
JournalI E E E Transactions on Antennas and Propagation
ISSN0018-926X
Publication statusAccepted/In press - Jan 2019
Publication categoryResearch
Peer-reviewedYes

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