Effect of the screen to metal-frame smartphone antennas

Xiao, Bing; Wong, Hang; Wang, Bo; Yeung, Kwan L.

doi:10.1109/iwat.2019.8730640

Cited by 9 publications

(24 citation statements)

References 8 publications

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“…Increasing screen-to-body ratio of mobile handsets is one of the trends in modern mobile communication systemswith this ratio going from 30.1% to 93.8% over the last 12 years [15], [16]. As a result, the screen covers nearly the entire front side, except for a few millimeters at the sides [17]. The screen is metal-covered to enhance the structural strength of the screen assembly [17].…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the screen covers nearly the entire front side, except for a few millimeters at the sides [17]. The screen is metal-covered to enhance the structural strength of the screen assembly [17]. In [3], the screen is modeled with only a dielectric plate (i.e., glass with a relative permittivity of 5.5), and hence it has a limited influence on the antenna performance in the 3.5 GHz 5G band.…”

Section: Introductionmentioning

confidence: 99%

“…However, the screen-to-body ratio is small (i.e., 45%) and the effect of the screen can, to some extent, be neglected. To the best of the authors' knowledge, there are very few literatures on smartphone antenna design that explicitly accounts for the large metal-covered screen in the design procedure [17], [19].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the large metal-covered screen was studied in [17] with respect to a metal-framed monopole antenna or planar inverted-F antenna (PIFA) mounted on the top end. It was found that the screen, which in reality is grounded to the terminal chassis, can severely degrade the antenna bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…In [19], the study of the metal-covered screen is extended to design a multi-band single-port antenna, covering GSM850/900, LTE1500, DCS, PCS, UMTS2100, LTE2300/2500, 3.5 GHz 5G bands. Specifically, characteristic mode analysis (CMA) [20] was used to address the bandwidth degradation effect of the large screen observed in [17]. This is because the screen can be included in the design procedure through CMA, and the bandwidth impact can be mitigated by selectively exciting and merging as many resonant characteristic modes (CMs) as possible.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Aliakbari¹,

Nie²,

Lau³

2020

Preprint

View full text Add to dashboard Cite

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Design of multi‐band antenna for LTE wearable device with shared slots and radiators for smart watch

Chen

Lin

Huang

et al. 2020

Int J RF Microw Comput Aided Eng

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In this study, multi-band antenna for LTE wearable device with shared slots and radiators for smart watch was present. This study incorporated 4G communication frequency bands, a GPS positioning system, and BT/Wi-Fi in a 43.6 × 43.6 × 5.8 mm 3 metal case to achieve satisfactory radiation fields and performance efficiency within a small space. This article presents an overview of the theory. There are four ports in the system. Frist, Port 1 is a lowfrequency antenna offering LTE 700 and GSM 850/900. The maximal gain and efficiency are respectively 3.9 dBi and 82%. Second, Port 2 is a high-frequency monopole with a winding long path on the side of the frame to achieve a reflection loss bandwidth that fully encompasses GSM 1800/1900/UMTS and LTE 2300/2500. The maximal gain and efficiency of this port are respectively 5.3 dBi and 92%. There are also have GPS (Port 3) and Wi-Fi (Port 4) antenna implement IFA and loop excitation mechanisms, respectively. This antenna system can fulfill the market demand. As confirmed through both simulation and measurement, the antenna can cover LTE bands. Increasing the path capacity of a MIMO system to increase the transmission speed is a crucial focus in mobile communication research and development.

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Impact of robot antenna calibration on dual-frequency smartphone-based high-accuracy positioning: a case study using the Huawei Mate20X

Darugna¹,

Wübbena²,

Wübbena³

et al. 2020

GPS Solut

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The access to Android-based Global Navigation Satellite Systems (GNSS) raw measurements has become a strong motivation to investigate the feasibility of smartphone-based positioning. Since the beginning of this research, the smartphone GNSS antenna has been recognized as one of the main limitations. Besides multipath (MP), the radiation pattern of the antenna is the main site-dependent error source of GNSS observations. An absolute antenna calibration has been performed for the dual-frequency Huawei Mate20X. Antenna phase center offset (PCO) and variations (PCV) have been estimated to correct for antenna impact on the L1 and L5 phase observations. Accordingly, we show the relevance of considering the individual PCO and PCV for the two frequencies. The PCV patterns indicate absolute values up to 2 cm and 4 cm for L1 and L5, respectively. The impact of antenna corrections has been assessed in different multipath environments using a high-accuracy positioning algorithm employing an undifferenced observation model and applying ambiguity resolution. Successful ambiguity resolution is shown for a smartphone placed in a low multipath environment on the ground of a soccer field. For a rooftop open-sky test case with large multipath, ambiguity resolution was successful in 19 out of 35 data sets. Overall, the antenna calibration is demonstrated being an asset for smartphone-based positioning with ambiguity resolution, showing cm-level 2D root mean square error (RMSE).

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Effect of the screen to metal-frame smartphone antennas

Cited by 9 publications

References 8 publications

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

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

Design of multi‐band antenna for LTE wearable device with shared slots and radiators for smart watch

Impact of robot antenna calibration on dual-frequency smartphone-based high-accuracy positioning: a case study using the Huawei Mate20X

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