GPS, Bluetooth and Wi-Fi tri-band antenna on metal frame of smartwatch

Jeon, Min-Hwan; Choi, Woo Cheol; Yoon, Young Joong

doi:10.1109/aps.2016.7696795

Cited by 17 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the radiation patterns are not stable for different frequencies. For antennas of mobile devices, the stability of radiation patterns is usually not particularly stressed, because the orientation of the mobile devices themselves is not fixed [25]- [27].…”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Utilization of Both Odd and Even Modes for Multi-band Dipole Antenna

Xiao¹

2021

Preprint

View full text Add to dashboard Cite

<p>Dipole antenna is the simplest type of antenna from the theoretical point of view. However, the majority of the research on it focuses on adding supplementary structures for producing more resonant modes to achieve more functions. Here, we focus on the inherent modes of the dipole itself. The dipole antenna has alternating odd and even modes. In classical antenna theory, only odd modes are excited. The even modes are difficult to be excited due to their very high input impedances. In this paper, both odd and even modes of the dipole antenna are excited simultaneously by a single port with a novel feeding structure. Moreover, in order to tune the resonant frequencies of such multiple modes, a method by combining antithetical structures of indentations and outdentations is proposed and intuitively explained by eigencurrent distribution. By these new techniques, all the first six modes of the dipole antenna are excited, among which five modes are utilized for IoT applications. The antenna could cover ISM bands of 868 MHz and 2450 MHz, GNSS band of 1575 MHz, and 5G bands of 3500 MHz and 4900 MHz. This research could broaden the application of this classic antenna.<br></p>

show abstract

Section: Simulated and Measured Resultsmentioning

confidence: 99%

“…For small multi-band antennas in mobile and IoT devices, the sizes are severely restricted. Thus, linearly polarized GNSS antennas are usually adopted [25]- [27].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Both Odd and Even Modes for Multi-band Dipole Antenna

Xiao¹

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…When the antenna was then mounted on a human wrist its efficiency and gain dropped to 26% and −0.89 dBi, respectively. Additionally, another example of the metal frame smartwatch was proposed in [12], however it was too bulky for wearable application. Also, a metal‐frame smartwatch antenna using a non‐planar high impedance surface was investigated in [13] but it has a complex structure making it unsuitable for smartwatch applications.…”

Section: Introductionmentioning

confidence: 99%

“…Considering these requirements, various difficulties exist pertaining to the manufacture of the antenna. Recently, smartwatches integrated antennas were proposed and analysed, such as several antennas designs with a metallic frame consisting of smartwatches [7][8][9][10][11][12][13] which can intensify the strength and rigidity of smartwatches, and create adorable metallic appearances for wearers; however, metallic housing can hinder wireless signals making the antenna design difficult. For example, in [8] an integrated metal-frame antenna for smartwatch was presented.…”

Section: Introductionmentioning

confidence: 99%

Watchstrap integrated wideband circularly polarized antenna design for smartwatch applications

Rabhi

Gahgouh

Gharsallah

2022

IET Microwaves Antenna & Prop

View full text Add to dashboard Cite

A circularly polarized antenna suitable for integration into the framework of smartwatches is reported in this manuscript. The proposed antenna operates in the industrial, scientific and medical band of 5.8 GHz with a footprint of about 45 � 15 � 1.6 mm 3 (0.8 λ � 0.2 λ � 0.03 λ) and is excited by a coplanar waveguide line loaded with an L-shaped radiator patch. The antenna prototype was studied in free space and then adapted to onbody scenarios using computer hand models. The performance of the antenna was validated in measurement in a realistic human hand, and the antenna achieves satisfactory on-body performance; measured and simulated results are in good agreement. Furthermore, for health risk concerns related to exposure to electromagnetic radiation, the specific absorption rate (SAR) analysis for the smartwatch on wrist-worn has also been presented which is far below the normal SAR criteria according to IEEE C95.1 guidelines. The simple structure of the proposed antenna and its high performance make it an ideal candidate for smartwatch applications in health care monitoring purpose. K E Y W O R D S circular polarization (CP), CPW feed antenna, smartwatch application, specific absorption rate (SAR), wearable antennaThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

“…Several studies on MIMO antennas have proposed the implementation of the antenna on the host object of a smart watch [4][5][6]; however, those studies were conducted for the 2.4 GHz band and did not specify the antenna efficiency. An antenna [7] was designed for the 2.4 and 5.2 GHz bands but managed to only provide the simulated efficiency of the 2.4 GHz band. A circular slot antenna for 2.4 GHz WLAN on a watchstrap has been investigated [8].…”

Section: Introductionmentioning

confidence: 99%

Watchstrap-Embedded Four-Element Multiple-Input–Multiple-Output Antenna Design for a Smartwatch in 5.2–5.8 GHz Wireless Applications

Sun

2018

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

This paper presents a compact four-element multiple-input-multiple-output (MIMO) antenna design operating within the WiFi 802.11 ac bands (5.2-5.84 GHz) for a smartwatch. The antenna is fabricated using a polyamide substrate and embedded into the strap of a smartwatch model; the strap is created using three-dimensional etching of plastic materials. The four-element MIMO antenna is formed by four monopole antennas, has a simple structure, and is connected to the system ground plane of the smartwatch. Due to the stub and notched block between two antennas and the slit in the system ground, the four-element MIMO antenna exhibits favorable isolation. Moreover, the envelope correlation coefficient of the antennas is considerably lower than 0.005 in the operating band. The measured −6 dB impedance bandwidths of the four elements of the antenna (Ant1-Ant4) with the human wrist encompass the WiFi 802.11 ac range of 5.2-5.84 GHz; moreover, an isolation of more than 20 dB is achieved. The measured antenna efficiency with and without a phantom hand are 45%-55% and 93%-97%, respectively.

show abstract

GPS, Bluetooth and Wi-Fi tri-band antenna on metal frame of smartwatch

Cited by 17 publications

References 2 publications

Utilization of Both Odd and Even Modes for Multi-band Dipole Antenna

Utilization of Both Odd and Even Modes for Multi-band Dipole Antenna

Watchstrap integrated wideband circularly polarized antenna design for smartwatch applications

Watchstrap-Embedded Four-Element Multiple-Input–Multiple-Output Antenna Design for a Smartwatch in 5.2–5.8 GHz Wireless Applications

Contact Info

Product

Resources

About