Two Asymmetrically Mirrored Gap-Coupled Loop Antennas as a Compact Building Block for Eight-Antenna MIMO Array in the Future Smartphone

A compact two-antenna building block for forming the multiple-input multiple-output (MIMO) array in the mobile device such as the smartphone is presented. The building block has a planar structure of small size 7 × 10 mm 2 (about 0.08λ × 0.12λ) for operating at 3.5-GHz band (3.4-3.6 GHz), which is t...

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Veröffentlicht in:IEEE transactions on antennas and propagation Jg. 65; H. 4; S. 1765 - 1778
Hauptverfasser: Wong, Kin-Lu, Tsai, Chih-Yu, Lu, Jun-Yu
Format: Journal Article
Sprache:Englisch
Veröffentlicht: IEEE 01.04.2017
Schlagworte:
Antenna arrays
Asymmetrically mirrored (AM) antennas
Channel capacity
Couplings
eight-antenna array
fifth-generation (5G) smartphones
gap-coupled loop antennas
MIMO
mobile antennas
Mobile communication
multiple-input multiple-output (MIMO) antennas
Printed circuits
ISSN:0018-926X, 1558-2221
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Zusammenfassung:A compact two-antenna building block for forming the multiple-input multiple-output (MIMO) array in the mobile device such as the smartphone is presented. The building block has a planar structure of small size 7 × 10 mm 2 (about 0.08λ × 0.12λ) for operating at 3.5-GHz band (3.4-3.6 GHz), which is the recently identified frequency spectrum in World Radiocommunication Conference 2015 for future broadband mobile services. The building block is formed by two gap-coupled loop antennas having asymmetrically mirrored (AM) structures with respect to the system ground plane of the smartphone. The two AM antennas show good isolation thereof and their envelope correlation coefficient is much less than 0.1 in the operating band, showing very good independence of the two antennas in their far-field radiation characteristics. By using four such building blocks, an eight-antenna MIMO array at 3.5-GHz band in the smartphone is easily implemented. The channel capacity of the eight-antenna MIMO array in an 8 \× 8 MIMO system is calculated to be about 36 b/s/Hz with 20-dB signal-to-noise ratio. The measured channel capacity obtained using an 8 × 8 MIMO measurement setup is also presented, which generally agrees with the calculated results. The obtained eight-antenna MIMO array is promising for future or fifth-generation smartphone applications.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2017.2670534