Miniaturized MIMO Antenna Design Based on Mode Cancellation Method for 5G Mobile Terminals

Yifan Lu; Changjiang Deng; Yiming Fan; Rongrong Dong

doi:10.1109/LAWP.2025.3587350

Miniaturized MIMO Antenna Design Based on Mode Cancellation Method for 5G Mobile Terminals

Yifan Lu, Changjiang Deng^*, Yiming Fan, Rongrong Dong

^*Corresponding author for this work

School of Integrated Circuits and Electronics

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

In this letter, a miniature multiple-input-multiple- output (MIMO) antenna pair operating at the 3.5 GHz band is proposed for 5G mobile terminals. The design consists of dual inverted-F antennas (IFAs) arranged in an asymmetric mirrored configuration with respect to the chassis ground plane, occupying a compact size of 12×5 mm^². By adding an inductor at the center of the 1-mm-wide gap between the two closely-spaced IFAs, the mutual coupling is greatly reduced. The decoupling mechanism is explained from the perspective of common mode (CM) and differential mode (DM) cancellation. A prototype of the proposed antenna pair is fabricated. The measured -6 dB overlapping bandwidth of the two ports covers the 3.4-3.6 GHz band, with port isolation higher than 22.4 dB.

Original language	English
Journal	IEEE Antennas and Wireless Propagation Letters
DOIs	http://doi.org/10.1109/LAWP.2025.3587350
Publication status	Accepted/In press - 2025

Keywords

high isolation
Mobile terminal antennas
mode cancellation
multiple-input-multiple-output (MIMO)

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10.1109/LAWP.2025.3587350

Cite this

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title = "Miniaturized MIMO Antenna Design Based on Mode Cancellation Method for 5G Mobile Terminals",

abstract = "In this letter, a miniature multiple-input-multiple- output (MIMO) antenna pair operating at the 3.5 GHz band is proposed for 5G mobile terminals. The design consists of dual inverted-F antennas (IFAs) arranged in an asymmetric mirrored configuration with respect to the chassis ground plane, occupying a compact size of 12×5 mm². By adding an inductor at the center of the 1-mm-wide gap between the two closely-spaced IFAs, the mutual coupling is greatly reduced. The decoupling mechanism is explained from the perspective of common mode (CM) and differential mode (DM) cancellation. A prototype of the proposed antenna pair is fabricated. The measured -6 dB overlapping bandwidth of the two ports covers the 3.4-3.6 GHz band, with port isolation higher than 22.4 dB.",

keywords = "high isolation, Mobile terminal antennas, mode cancellation, multiple-input-multiple-output (MIMO)",

author = "Yifan Lu and Changjiang Deng and Yiming Fan and Rongrong Dong",

note = "Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",

year = "2025",

doi = "10.1109/LAWP.2025.3587350",

language = "English",

journal = "IEEE Antennas and Wireless Propagation Letters",

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TY - JOUR

T1 - Miniaturized MIMO Antenna Design Based on Mode Cancellation Method for 5G Mobile Terminals

AU - Lu, Yifan

AU - Deng, Changjiang

AU - Fan, Yiming

AU - Dong, Rongrong

PY - 2025

Y1 - 2025

N2 - In this letter, a miniature multiple-input-multiple- output (MIMO) antenna pair operating at the 3.5 GHz band is proposed for 5G mobile terminals. The design consists of dual inverted-F antennas (IFAs) arranged in an asymmetric mirrored configuration with respect to the chassis ground plane, occupying a compact size of 12×5 mm². By adding an inductor at the center of the 1-mm-wide gap between the two closely-spaced IFAs, the mutual coupling is greatly reduced. The decoupling mechanism is explained from the perspective of common mode (CM) and differential mode (DM) cancellation. A prototype of the proposed antenna pair is fabricated. The measured -6 dB overlapping bandwidth of the two ports covers the 3.4-3.6 GHz band, with port isolation higher than 22.4 dB.

AB - In this letter, a miniature multiple-input-multiple- output (MIMO) antenna pair operating at the 3.5 GHz band is proposed for 5G mobile terminals. The design consists of dual inverted-F antennas (IFAs) arranged in an asymmetric mirrored configuration with respect to the chassis ground plane, occupying a compact size of 12×5 mm². By adding an inductor at the center of the 1-mm-wide gap between the two closely-spaced IFAs, the mutual coupling is greatly reduced. The decoupling mechanism is explained from the perspective of common mode (CM) and differential mode (DM) cancellation. A prototype of the proposed antenna pair is fabricated. The measured -6 dB overlapping bandwidth of the two ports covers the 3.4-3.6 GHz band, with port isolation higher than 22.4 dB.

KW - high isolation

KW - Mobile terminal antennas

KW - mode cancellation

KW - multiple-input-multiple-output (MIMO)

UR - http://www.scopus.com/pages/publications/105010214339

U2 - 10.1109/LAWP.2025.3587350

DO - 10.1109/LAWP.2025.3587350

M3 - Article

AN - SCOPUS:105010214339

SN - 1536-1225

JO - IEEE Antennas and Wireless Propagation Letters

JF - IEEE Antennas and Wireless Propagation Letters

ER -

Miniaturized MIMO Antenna Design Based on Mode Cancellation Method for 5G Mobile Terminals

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Keywords

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