A Quad-Antenna System for 4G/5G/GPS Metal Frame Mobile Phones

Huang, Daiwei; Du, Z.; Wang, Yan

doi:10.1109/lawp.2019.2924322

Cited by 56 publications

(31 citation statements)

References 23 publications

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“…It should be noted that all three antennas are frame antennas, and all frames are higher than 6.2 mm, which is not conducive to the realization of ultra-thin antennas. In addition, some metal frame antennas have also been proposed for 5G terminal communication [30,31].…”

Section: Introductionmentioning

confidence: 99%

A Low-Profile and High-isolated MIMO Antenna for 5G Mobile Terminal

Sun

et al. 2020

Micromachines

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An eight-element multiple-input multiple-output (MIMO) frame antenna array in the 3.5 GHz band (3400–3600 MHz) for 5G mobile terminal systems was presented. By using the adjacent grounding and electromagnetic coupling feeding technology, the loop antenna element could generate two resonant frequencies, thus effectively expanding its bandwidth. By adopting double-sided parallel strip line (DSPSL) technology, the electromagnetic coupling inside the loop antenna could be adjusted, and the size of the loop antenna could be effectively reduced so that the MIMO antenna array could obtain a low-profile structure. The total size of the MIMO array was 150 mm × 75 mm × 5.3 mm. Without additional isolation measures, the measured −6 dB impedance bandwidth (BW) was 3400–3660 MHz, and the minimum isolation between antenna elements was better than −20 dB. The proposed antenna was expected to be applied to 5G mobile terminals based on its low-profile, high-isolated characteristics, and good MIMO performance.

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Section: Introductionmentioning

confidence: 99%

A Low-Profile and High-isolated MIMO Antenna for 5G Mobile Terminal

Sun

et al. 2020

Micromachines

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“…Nonetheless, dual-port MIMO antennas with moderate to low coupling/correlation have been successfully designed for frequency bands below 1 GHz [5], [7]- [14], either by having a second self-resonant antenna that does not radiate through the chassis (hence narrowband) [5], [7] or facilitating a second resonant mode in these bands through making use of minor changes in the chassis [8]- [14]. The minor changes include the use of loading strips [8], [9] and a bezel frame [10]- [13], some in combination with a larger chassis width (~80 mm) [12]- [14].…”

Section: Introductionmentioning

confidence: 99%

Large Screen Enabled Tri-port MIMO Handset Antenna for Low LTE Bands

Aliakbari¹,

Nie²,

Lau³

2020

Preprint

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In recent years, the screen-to-body ratio of mobile handsets has been increasing. Today, the screen nearly fills up the entire front side. Conventionally, the screen is mainly seen as a metallic object that adversely affects antenna performance. In this paper, the large screen is used for the first time to facilitate an additional uncorrelated MIMO port in a tri-port design, for several LTE bands below 1 GHz. To this end, the design procedure explicitly considers the screen together with the terminal chassis, which can be simply modelled as two metal plates. In particular, characteristic mode analysis of the double-plate model enables a sufficient number of resonant modes to be created, tuned and selectively excited to yield three uncorrelated MIMO ports in the low band. Simulation and measurement results are found to be in good agreement. The measured bandwidths of the three ports are 23%, 17% and 21%, respectively. Within the operating band, the measured isolation is above 13 dB, envelope correlation coefficient below 0.16 and average total efficiency above 72%.

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“…However, in this design, the two self-resonant antennas were well separated (i.e., 150 mm or λ0/2 at 1 GHz) and they require a ground clearance of 16 mm and a profile of 7 mm. The two low-band ports in [22] were designed for a metal-framed chassis using the same idea of placing the ports far away from each other, and they achieve measured efficiencies of above 47%, isolation of above 10 dB and ECC of below 0.35. They require a ground clearance of 10 mm and the metal frame limits the chassis profile to 7.5 mm.…”

Section: Introductionmentioning

confidence: 99%

Low-Profile Two-Port MIMO Terminal Antenna for Low LTE Bands with Wideband Multimodal Excitation

Aliakbari¹,

Lau²

2020

Preprint

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It is challenging to design multiple-input multiple-output (MIMO) terminal antennas for LTE bands below 1 GHz, due to the conventional chassis offering only one resonant characteristic mode. Recently, it was shown that minor structural changes can yield additional resonant mode(s), which were used to design two-port MIMO antennas. However, the resulting bandwidth for the second port does not cover the low LTE bands. Herein, a new approach to structural changes and feed design is proposed for the design of a low profile (4 mm) two-port MIMO antenna that covers all common low LTE bands (0.75-0.96 GHz) with total efficiency of above 67%. The large symmetric bandwidth (25%) is achieved using three additional resonant modes obtained by structural changes as well as two simple probe-feed ports jointly exciting weighted combinations of the four modes over frequency. The envelope correlation coefficient of below 0.15 is facilitated by the different phase shifts of the characteristic electric fields at the port locations. Moreover, the design requires no ground clearance, no decoupling structure and the two ports are separated by only 0.2 wavelength. Finally, to show design flexibility, a third antenna is added to the top of the chassis to create a three-port MIMO antenna

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A Quad-Antenna System for 4G/5G/GPS Metal Frame Mobile Phones

Cited by 56 publications

References 23 publications

A Low-Profile and High-isolated MIMO Antenna for 5G Mobile Terminal

A Low-Profile and High-isolated MIMO Antenna for 5G Mobile Terminal

Large Screen Enabled Tri-port MIMO Handset Antenna for Low LTE Bands

Low-Profile Two-Port MIMO Terminal Antenna for Low LTE Bands with Wideband Multimodal Excitation

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