MIMO antenna for mobile terminals with enhanced isolation in LTE band

Prakash, J. Arun; Vijay, Roshan; Natarajamani, S

doi:10.1109/icacci.2017.8126177

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…The 10dB isolation is guaranteed by three neutralization lines. In [18], a 2×2 MIMO monopole array with a ground branch decoupling structure has been presented. It covers the band of 2.2-2.48GHz with high isolation (more than 20dB) and low ECC (less than 0.01).…”

Section: Introductionmentioning

confidence: 99%

High-Isolation Eight-Element MIMO Array for 5G Smartphone Applications

et al. 2019

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In this paper, an eight-element MIMO array for 5G smartphone applications in the 3. GHz) is presented. The array consists of two types of four-antenna arrays (U-shaped and L-shaped coupled-fed loop elements), which are symmetrically distributed in the inner of the smartphone frame. The dimension of the system circuit board is 124 mm × 74 mm and the size of two elements is 4.8 mm × 9.8 mm (0.055λ × 0.11λ, λ represents the free-space wavelength at 3.45 GHz) and 4.9 mm × 12.5 mm (0.056λ × 0.14λ), respectively. The proposed MIMO array is simulated, and a prototype is fabricated and tested. The results show that all the elements can cover the desired band of 3.3-3.6 GHz under the condition of −6-dB impendence bandwidth. The isolations are enhanced to 15 dB by combining the inverted-I ground slots with neutralization line (NL) structure. In addition, the envelope correlation coefficient (ECC) via any two elements is below 0.15 that shows good independence in far-field radiation characteristic. The measured efficiencies of the elements in the operating band are higher than 40%. Moreover, the array ergodic channel capacity is also calculated based on the correlation matrix method to be about 35 bps/Hz with a 20-dB signal-to-noise ratio. In addition, the effects of the user's hand and the head has been analyzed as well. Based on the above, the proposed eight-element MIMO array is a prospective candidate for future 5G smartphone applications.INDEX TERMS Channel capacity, eight-element array, high isolation, MIMO antenna.

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Section: Introductionmentioning

confidence: 99%

High-Isolation Eight-Element MIMO Array for 5G Smartphone Applications

et al. 2019

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“…The neutralization line, 6 lumped element, [7][8][9] metasurface, 10 and decoupling network 11 can be used to cancel the mutual coupling of the neighboring antenna elements. Besides, parasitic elements or branches [12][13][14] and defected ground structure [15][16][17] can be used to improve isolation between antenna elements. However, utilizing an extra decoupling structure not only contributes to the efficiency's loss but also occupies more space resulting in seizing the area for the antenna.…”

Section: Introductionmentioning

confidence: 99%

Shared radiator based high‐isolated tri‐port mobile terminal antenna group design

Huang

Jiang

Zhang

et al. 2022

Int J RF Mic Comp-Aid Eng

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This article proposes a high‐isolated tri‐port antenna group for 5G mobile terminals based on the shared radiator and mode orthogonality technology, which is realized by exciting the two orthogonal currents through two ports on a shared loop radiator and a patch antenna orthogonal to the loop on the back of the mobile terminal. The −6 dB impedance bandwidth of the three ports in the antenna group could cover the 3.4–3.6 GHz 5G band, while the isolation is above 20 dB within the antenna group, a very compact volume. In addition, a 12 × 12 MIMO antenna is proposed by integrating four antenna groups. The MIMO antenna still has measured isolation above 18 dB and efficiency above 50% over the operation band thanks to the orthogonal decoupling design. A good multiplexing performance is also achieved with the ECC of <0.08 and peak channel capacity of 60.29 bps/Hz at 20 dB SNR.

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“…In (31), a MIMO monopole antenna with a ground branch decoupling structure of less than 0.01 ECC, low mutual coupling and more than 20dB of high isolation was also proposed. Covering a band of 2.2-2.48GHz, this dual polarized MIMO antenna system of four orthogonal thin copper dipoles (23) was also discovered to have been popularly used in the high-order decoupling modes (32). The MIMO antenna elements that had been placed in the constant null-amplitude field points too were found to have given rise to an enhanced isolation as a result of the respective usage from the decoupling network-based method (33) on a pair of narrow and wide slots as well as the two decoupling devices with an inverted T-shaped etched slot and a meandering resonant branch for the lower and higher bands.…”

Section: Introductionmentioning

confidence: 99%

Compact MIMO Slots Antenna Design with Different Bands and High Isolation for 5G Smartphone Applications

Ibrahim¹

2020

Baghdad Sci.J

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In this paper, two elements of the multi-input multi-output (MIMO) antenna had been used to study the five (3.1-3.55GHz and 3.7-4.2GHz), (3.4-4.7 GHz), (3.4-3.8GHz) and (3.6-4.2GHz) 5G bands of smartphone applications that is to be introduced to the respective US, Korea, (Europe and China) and Japan markets. With a proposed dimension of 26 × 46 × 0.8 mm3, the medium-structured and small-sized MIMO antenna was not only found to have demonstrated a high degree of isolation and efficiency, it had also exhibited a lower level of envelope correlation coefficient and return loss, which are well-suited for the 5G bands application. From the fabrication of an inexpensive FR4 substrate with a 0.8 mm thickness level, a loss tangent of 0.035 and a dielectric constant of 4.3, the proposed MIMO antennas that had been simulated under the five different band coverage were discovered to have demonstrated a respective isolation level of about 14dB, 12dB, 21.5dB, 19dB and 20dB under a -10dB impendence bandwidth. In the measurement and fabrication outcomes that were derived from the use of the prototype MIMO in the (3.4-3.8) band of the Europe and Chinese markets, the proposed MIMO was thus found to have produced a better performance in terms of efficiency, isolation, and envelope correlation coefficient (ECC).

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MIMO antenna for mobile terminals with enhanced isolation in LTE band

Cited by 7 publications

References 7 publications

High-Isolation Eight-Element MIMO Array for 5G Smartphone Applications

High-Isolation Eight-Element MIMO Array for 5G Smartphone Applications

Shared radiator based high‐isolated tri‐port mobile terminal antenna group design

Compact MIMO Slots Antenna Design with Different Bands and High Isolation for 5G Smartphone Applications

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