Characterization of a Coaxially-fed MIMO Antenna for n257 mmWave IoT Applications
Rizvi, Syed Naheel Raza; Mazhar, Abdullah; Maddegalla, Maheeja; Rafique, Umair; Zahra, Hijab; Abbas, Syed Muzahir (2025-03-20)
IEEE
20.03.2025
S. N. R. Rizvi, A. Mazhar, M. Maddegalla, U. Rafique, H. Zahra and S. M. Abbas, "Characterization of a Coaxially-fed MIMO Antenna for n257 mmWave IoT Applications," 2024 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), Hyderabad, India, 2024, pp. 1-3, doi: 10.1109/MAPCON61407.2024.10923346.
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© 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202505284020
https://urn.fi/URN:NBN:fi:oulu-202505284020
Tiivistelmä
Abstract
This work presents the design and characterization of a coaxially-fed multiple-input multiple-output (MIMO) antenna for n257 band low-latency internet-of-things (IoT) applications. The proposed MIMO design offers -10 dB impedance bandwidth from 25.8 to 28.77 GHz, covering the globally designated n257 band. The design of the antenna is compact and architecturally simple and offers peak gain up to 9.8 dBi at a resonant frequency of 27 GHz, with a radiation efficiency of above 95% in the covered spectrum. Furthermore, the design features a compact inter-element spacing of 0.18λ and a minimum isolation of 31 dB throughout the operational frequency band. The proposed MIMO antenna has an envelope correlation coefficient (ECC) value below 0.0002 and a mean effective gain (MEG) value less than -3 dB in the entire millimeter-wave (mmWave) n257 band spectrum, which renders it suitable for high-speed IoT applications.
This work presents the design and characterization of a coaxially-fed multiple-input multiple-output (MIMO) antenna for n257 band low-latency internet-of-things (IoT) applications. The proposed MIMO design offers -10 dB impedance bandwidth from 25.8 to 28.77 GHz, covering the globally designated n257 band. The design of the antenna is compact and architecturally simple and offers peak gain up to 9.8 dBi at a resonant frequency of 27 GHz, with a radiation efficiency of above 95% in the covered spectrum. Furthermore, the design features a compact inter-element spacing of 0.18λ and a minimum isolation of 31 dB throughout the operational frequency band. The proposed MIMO antenna has an envelope correlation coefficient (ECC) value below 0.0002 and a mean effective gain (MEG) value less than -3 dB in the entire millimeter-wave (mmWave) n257 band spectrum, which renders it suitable for high-speed IoT applications.
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