Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

Luo, Shiming; Pedersen, Gert Frølund; Zhang, Shuai

doi:10.1109/tcsii.2022.3216394

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…With the introduction of a dielectric board above the antennas an additional wave route is found and with the adequate magnitude and phase the additional wave can suppress existing coupled waves. Other decoupling structures can include decoupling cavities as it is shown in [214] where the decoupling cavity has high transmission in the normal direction and high insertion loss in the tangential direction of the array in order to allow space waves to be propagated in the normal direction and be suppressed in the tangential direction. This results in schematics found in FIGURE 21 and an isolation enhancement of about 24 dB for a 16-element array operating between 4.21-4.79 GHz.…”

Section: Overcoming Mutual Coupling In Massive Mimo and Mmwavesmentioning

confidence: 99%

A Review on Mutual Coupling Reduction Techniques in mmWaves Structures and Massive MIMO Arrays

Ramos,

Varum,

Matos

2023

IEEE Access

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In the most recent years multiple-input multiple-output (MIMO) antennas have been widely implemented to take advantage of the opportunity in controlling their radiation pattern and/or polarization in overcoming modern telecommunication systems issues. High levels of mutual coupling can lead to great degradation of an antenna's performance and as such, the study of solutions to minimize its impact was encouraged. This paper provides a literature review of the mutual coupling analysis and its possible mitigation techniques in various systems including massive multiple-input multiple-output (MIMO) systems and mmWaves antennas. Besides going through the main decoupling techniques, this letter compares the different achievements with the respective approaches, and it even allows the understanding of the main advantages and downsides of each one of the techniques studied.

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Section: Overcoming Mutual Coupling In Massive Mimo and Mmwavesmentioning

confidence: 99%

A Review on Mutual Coupling Reduction Techniques in mmWaves Structures and Massive MIMO Arrays

Ramos,

Varum,

Matos

2023

IEEE Access

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“…MIMO antenna designed for the metal‐frame type smart watch using theory related to characteristic modes, 29 a high‐isolation characteristic modes (CMs) for smart phone applications 30 . In addition to the cited literature, many researchers have proposed various decoupling techniques for isolation improvement or mutual coupling reduction in array or MIMO antennas and new techniques for the 5G systems 31–38 . In recent years, many researchers have designed and suggested different MIMO antenna designs for different applications including UWB, sub‐6 GHz, and mm‐wave 5G systems 39–50 .…”

Section: Introductionmentioning

confidence: 99%

“…30 In addition to the cited literature, many researchers have proposed various decoupling techniques for isolation improvement or mutual coupling reduction in array or MIMO antennas and new techniques for the 5G systems. [31][32][33][34][35][36][37][38] In recent years, many researchers have designed and suggested different MIMO antenna designs for different applications including UWB, sub-6 GHz, and mm-wave 5G systems. [39][40][41][42][43][44][45][46][47][48][49][50] Other than MIMO antennas, researchers have designed and reported many other configurations of fifth generation (5G) printed antennas for next generation communication applications.…”

mentioning

confidence: 99%

Broadband sub‐6 GHz flower‐shaped MIMO antenna with high isolation using theory of characteristic mode analysis (TCMA) for 5G NR bands and WLAN applications

Babu¹,

Das²,

Ali

et al. 2023

Int J Communication

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A small size neutralization line integrated flower-shaped MIMO antenna is designed and analyzed for sub-6 GHz type 5G NR frequency bands like n79 (4400-5000 MHz), n78 (3300-3800 MHz), n77 (3300-4200 MHz), and WLAN (5150-5825 MHz) applications. The novel approach of theory of characteristic mode analysis (TCMA) is introduced to provide physical insight of the designed structure and its characteristics behavior. Due to the suggested modifications in the geometry, the isolation among the patches is greatly increased.The overall miniaturized dimension of the MIMO antenna is 25 Â 40 mm 2 . The edge-edge spacing among the elements is 0.0233λ. The prototype antenna is fabricated and measured that shows good agreement compared with simulated results. The designed MIMO antenna without the presence of decoupling structure offers an isolation of 28 dB, gain of 3.6 dBi, and radiation efficiency of 69.7% at the resonant frequency. The proposed MIMO antenna covers a broad range of frequency band from 3.296 to 5.962 GHz with À10 dB impedance bandwidth of 2666 MHz and maintains a good isolation of greater than 50 dB for the entire operating band. The tested radiation efficiency and gain are 85.3% and 6.22 dBi at 3.5 GHz. Moreover, the diversity parameters of the neutralization line integrated MIMO antenna, that is, channel capacity loss (CCL) isolation, mean effective gain (MEG), total active reflection coefficient (TARC) diversity gain (DG), and envelope correlation coefficient (ECC), are analyzed and discussed in this article.

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Decoupling Network Integrated With CSRR-Based Filtering Power Dividers for Antenna Arrays

Zhang

et al. 2023

IEEE Trans. Circuits Syst. II

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This brief provides a mutual coupling suppression network for antenna arrays with high frequency selectivity. The proposed network is composed of three-order (denoting three decoupling bridges established by transmission lines) decoupling networks and unequal power dividers consisting of complementary split-ring resonators featuring bandpass and harmonic suppression responses. All the decoupling structures are highly integrated. A design example of a 2×4 patch antenna array, working at 4.9 GHz and integrated with the proposed decoupling network, is constructed and fabricated. Simulated and measured results indicate that the antenna array is welldecoupled involving the suppression of vertical, horizontal, and diagonal coupling paths. The measured common bandwidth of impedance matching (|Sii| < -10 dB) and isolation (> 25 dB) is from 4.8 to 5.1 GHz. A small insertion loss of 0.35 dB is introduced. Moreover, a filtering response is observed, and gain nulls are generated at the two sides of the operating band. As for the demonstrator, spurious up to 11 GHz is well suppressed and the peak gain at the harmonic band is reduced by over 20 dB, exhibiting a good harmonic suppression performance.

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Massive MIMO Array Design With High Isolation by Using Decoupling Cavity

Cited by 6 publications

References 19 publications

A Review on Mutual Coupling Reduction Techniques in mmWaves Structures and Massive MIMO Arrays

A Review on Mutual Coupling Reduction Techniques in mmWaves Structures and Massive MIMO Arrays

Broadband sub‐6 GHz flower‐shaped MIMO antenna with high isolation using theory of characteristic mode analysis (TCMA) for 5G NR bands and WLAN applications

Decoupling Network Integrated With CSRR-Based Filtering Power Dividers for Antenna Arrays

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