A 64-Element and Dual-Polarized SICL-Based Slot Antenna Array Development Applied to TDD Massive MIMO

This letter reports the concept, design, fabrication, and characterization of a novel 64-element, slot-based and substrate-integrated coaxial line (SICL)-fed dual-polarized antenna array (SICL-SAA) for fully digital massive multiple-input-multiple-output (mMIMO) applications. The proposed array is c...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2022-04, Vol.21 (4), p.750-754
Main Authors: Filgueiras, Hugo Rodrigues Dias, Cerqueira Sodre, Arismar
Format: Article
Language:English
Subjects:
Antenna array
Antenna arrays
Bandwidth
Bandwidths
Boresights
Dual polarization (waves)
Feeding
Impedance
massive multiple-input–multiple-output (mMIMO)
Mutual coupling
Numerical models
Propagation modes
Radiation shielding
slot antenna
Slot antennas
substrate-integrated coaxial line (SICL) and time-division duplexing (TDD)
Substrates
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Summary:This letter reports the concept, design, fabrication, and characterization of a novel 64-element, slot-based and substrate-integrated coaxial line (SICL)-fed dual-polarized antenna array (SICL-SAA) for fully digital massive multiple-input-multiple-output (mMIMO) applications. The proposed array is composed of ±45° polarized elements based on half-wavelength slots. Each slot has its own back cavity, acting as an individual reflector for enabling boresight radiation. The slot is fed using a SICL feeding line for shielding the propagating mode in the feeding network, aiming at low mutual coupling levels. Experimental results in excellent agreement with full-wave numerical simulations demonstrate up to 2 GHz bandwidth from 24.5 GHz to 26.5 GHz for all array elements. Furthermore, the mutual coupling between adjacent elements is kept lower than −23 dB for the entire bandwidth, the radiating elements provide an 85° beamwidth in both planes (ϕ = 0° and ϕ = 90°) and 7.4 dBi gain.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2022.3144916