A Novel Dual-Band Decoupling Technique

Li, Min; Jamal, Muhammad Yasir; Yeung, Kwan L.; Jiang, Lijun

doi:10.1109/tap.2020.2995314

Cited by 23 publications

(9 citation statements)

References 44 publications

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“…The metasurfaces achieve suppressions of mutual coupling over a bandwidth less than 16%, which is not wide enough for 5G bands. The second category is employing decoupling networks [13]- [20] between the input ports of antenna elements. But those elaborately designed decoupling networks may be hard to be implemented on a large scale within a limited volume.…”

Section: Introductionmentioning

confidence: 99%

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Qin

Cui

2020

IEEE Access

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An embeddable decoupling structure is proposed for massive multiple-input-multiple-output (M-MIMO) antennas in this paper. The embeddable decoupling structure is made up of an end-folded metal strip and a pair of C-shaped metal strips. By introducing the embeddable decoupling structure near two closely spaced dipole antennas, additional coupling can be generated to counterbalance the original mutual coupling between the dipole antennas. The decoupling structure is firstly designed for a 1×2 MIMO antenna, which can provide a reduction of about 5 dB for the mutual coupling. Then, an evolutional decoupling structure is designed, which is composed of a pair of inverted U-shaped metal strips and two parallel reversed C-shaped metal strips. The evolutional decoupling structure is employed in a 3×3 MIMO antenna operating in 5G bands to demonstrate its capability of decoupling. An average reduction of about 10 dB on mutual coupling is obtained over 3.3-4.5 GHz (30.8%). Moreover, it is found that the deteriorated radiation patterns due to the mutual coupling are improved. The decoupling structure can be totally embedded in a M-MIMO antenna, which has no increase in the antenna volume. The proposed decoupling structure exhibits advantages of radiation pattern distortion alleviation, wideband, embeddable, and dual-polarized capabilities for M-MIMO applications.

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Section: Introductionmentioning

confidence: 99%

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Qin

Cui

2020

IEEE Access

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“…In Ref. [15,16], a decoupling network is placed between two antenna elements to improve the isolation performance in the two‐port MIMO system. Recently, common mode/differential mode (CM/DM) cancellation technique [ 17 ] is proposed for symmetrical antenna pair decoupling.…”

Section: Overview Of Mimo Antenna Decoupling Techniquesmentioning

confidence: 99%

Antenna Decoupling Based on Characteristic Modes Cancellation

Chu

Zeng

2022

Chinese J of Electronics

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The demand for a high transmission data rate in 5G leads to the wide application of the multi‐input, multi‐output (MIMO) technique. However, the narrow design space in mobile phone causes severe unexpected coupling between antenna units and deteriorate the system performance dramatically. In this paper, we focus on the antenna coupling within the MIMO system. Some decoupling techniques are summarized, such as neutralization line, decoupling network, common/differential mode cancellation, etc. Finally, new decoupling research developments of modal currents cancellation based on the theory of characteristic mode are elaborated. Two design examples are shown to validate the benefit of the proposed decoupling method. The −6 dB impedance bandwidth of the head‐to‐head antenna pair can cover 3.4–3.6 GHz. The isolation level is improved from more than 3.7 dB to more than 13 dB. The tail‐to‐tail antenna pair can cover 3.3–5 GHz and the isolation level is improved from more than 5 dB to more than 10 dB in the whole operating bandwidth. Both antenna pairs can achieve an envelop correlation coefficient of less than 0.2 and the antenna efficiencies are more than 40%.

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“…Nevertheless, the corresponding bandwidths in which the coupling is reduced are not very wide. A dual-band decoupling network is reported in [38]. Here, the coupling via free space is cancelled by the secondary coupling path via the decoupling circuit at two different frequency bands.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Multiband Metamaterial Antennas With Dual-Band Isolation Enhancement

Milias

Andersen²,

Lazaridis

et al. 2022

IEEE Access

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We present electrically small, multi-band, metamaterial-inspired antennas with adequate radiation characteristics and isolation enhancement. The antenna element consists of a complementary split-ring resonator (CSRR) embedded in a small monopole that has a size of λ/8 × λ/10 at the lowest frequency band, while rectangular patches are placed underneath it to further improve the performance. The antenna operates at the 2.4-2.5/2.9-4.8/5.1-6.5 GHz frequency bands. Moreover, we propose a systematic, metamaterial-based approach in order to improve the isolation between two of these small, closely spaced antenna elements at the lowest and highest frequency bands. The proposed techniques reduce the coupling by up to 29 dB without increasing the size of the structure. In particular, the isolation enhancement at the highest frequency band of interest is remarkably wideband. The cable effect, which is a common concern during the measurements of small antennas, is examined as well. The proposed antennas are not only small but also densely packed and can be easily integrated with modern, compact communication devices with advanced functionality. Simulations along with experimental results validate the effectiveness of our design.

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A Novel Dual-Band Decoupling Technique

Cited by 23 publications

References 44 publications

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Embeddable Structure for Reducing Mutual Coupling in Massive MIMO Antennas

Antenna Decoupling Based on Characteristic Modes Cancellation

Miniaturized Multiband Metamaterial Antennas With Dual-Band Isolation Enhancement

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