Omni-Directional Circularly Polarized Button Antenna for 5 GHz WBAN Applications

Hu, Xiaomu; Yan, Sen; Zhang, Jiahao; Volskiy, Vladimir; Vandenbosch, Guy A. E.

doi:10.1109/tap.2021.3070896

Cited by 36 publications

(27 citation statements)

References 21 publications

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“…The advantage of the 2. 4 GHz band is that it allows wireless products to still have a flexible choice of low power and low bandwidth. Some studies on glasses antennas also include LTE bands.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

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Dual-Band 6 × 6 MIMO Antenna System for Glasses Applications Compatible with Wi-Fi 6E and 7 Wireless Communication Standards

Chung¹,

Hsiao²

2022

Electronics

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Multi-user multiple-input and multiple-output (MU-MIMO) systems are the mainstream of current antenna design. This paper proposes a dual-band 6 × 6 MIMO glasses antenna for Wi-Fi 6E and Wi-Fi 7 indoor wireless communication. The six antennas have the same structure, all of which are F-shaped monopole antennas. They are on the left and right temples, at the upper and lower ends of the left and right frames, which effectively uses the space of the glasses. The substrate uses FR4 (εr=4.4, tanδ=0.02). The antenna design is compact (9 mm × 50 mm × 0.8 mm) and the glasses model is made of FR4. The overall model is similar to virtual reality (VR) glasses, which are convenient for a user to wear. The proposed antenna has three working frequency bands, at 2.4 GHz, 5 GHz, and 6 GHz. Through matching and optimization, the reflection coefficient can be lower than −10 dB. In addition, this paper evaluates two usage environments for simulation and measurement on the head and free space. The measurement results show that when the operating frequency band is at 2.45 GHz, the antenna efficiency is 86.1%, and the antenna gain is 1.9 dB. At 5.5 GHz, the antenna efficiency is 86.5%, and the antenna gain is 4.4 dB. At 6.7 GHz, the antenna efficiency is 85.4%, and the antenna gain is 3.7 dB. When the isolation of the MIMO antenna system is optimized, the low-frequency band is better than −10 dB, and the high-frequency band is better than −20 dB. The measured envelope correlation coefficient (ECC) values are all lower than 0.1.

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Section: Conflicts Of Interestmentioning

confidence: 99%

“…More and more companies are developing smart glasses products like those of Google and Facebook. In the next generation, the popularization of intelligent wearable devices will significantly improve people's living habits [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Dual-Band 6 × 6 MIMO Antenna System for Glasses Applications Compatible with Wi-Fi 6E and 7 Wireless Communication Standards

Chung¹,

Hsiao²

2022

Electronics

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“…The explored design incorporates a rectangular slot at the middle of the patch and a chamfer at the patch periphery to achieve CP radiation. While significant efforts in developing CP wearable antennas have been reported in recent years [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], to our knowledge, this is the first CP wearable antenna ever reported that is concurrently flexible and transparent.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Circularly Polarized Patch Antenna for Reliable Unobtrusive Wearable Wireless Communications

Sayem

Simorangkir²,

Lalbakhsh

et al. 2022

Sensors

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This paper presents a circularly polarized flexible and transparent circular patch antenna suitable for body-worn wireless-communications. Circular polarization is highly beneficial in wearable wireless communications, where antennas, as a key component of the RF front-end, operate in dynamic environments, such as the human body. The demonstrated antenna is realized with highly flexible, robust and transparent conductive-fabric-polymer composite. The performance of the explored flexible-transparent antenna is also compared with its non-transparent counterpart manufactured with non-transparent conductive fabric. This comparison further demonstrates the suitability of the proposed materials for the target unobtrusive wearable applications. Detailed numerical and experimental investigations are explored in this paper to verify the proposed design. Moreover, the compatibility of the antenna in wearable applications is evaluated by testing the performance on a forearm phantom and calculating the specific absorption rate (SAR).

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“…The other communication establishes the internal links between the wearable devices on the body, called on-body channel communication, that requires an antenna with omnidirectional radiation pattern to suppress the radiation in unwanted directions. Various kinds of on-body communication antennas have been presented [22][23][24][25][26][27][28]. Both on-body and off-body communications require the antenna with compact size, high efficiency, low specific absorption rate (SAR), and comfortability to wearers.…”

mentioning

confidence: 99%

“…Recently, a button antenna, with its advantages, has been widely used in wearable antenna design [16,29,32,33,[42][43][44][45][46]. The advantages of the button antenna over the planar antenna are as follows.…”

mentioning

confidence: 99%

Wearable Pattern-Diversity Dual-Polarized Button Antenna for Versatile On-/Off-Body Communications

Kim

Yun

2022

IEEE Access

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A wearable dual-port button antenna that excites pattern-diversity dual-polarized waves is proposed for on-/off-body applications. Its simple structure comprises of two radiators and a common ground plane designed into two substrates. The crossed-dipole radiator is made by two symmetric bowtie dipoles printed on a circular-shaped semi-rigid substrate, which covers an ultra-wideband (UWB) application with circular polarization and directional radiation patterns, high gain, and high efficiency suitable for off-body communication. The annular-ring radiator and common ground plane are made by a conductive textile on the square-shaped flexible-felt substrate. The annular-ring radiator is shorted to the ground plane using four vias, which generates triple TM modes covering the 2.45/5.85 GHz wireless body area networks (WBAN) with omni-directional radiation patterns and a 3.8 GHz C-band with a directional radiation pattern suitable for on-/off-body communications. The fabricated antenna is verified by measurement in both free space and phantom body environment. Measurements agreed well with simulations. Simulated specific absorption rates (SARs) under US and EU standards are below the safe level, making the proposed antenna suitable for on-/off-body communications.INDEX TERMS button antenna, circular polarization, dual-mode, dual-polarized, wearable antenna. I. INTRODUCTIONWireless body-area networks (WBANs) have drawn significant attention in the internet of things (IoTs), especially in biomedical systems for healthcare, physical training, and patient recovery progress. In such applications, the biological conditions, including body temperature, heart-rate, and blood pressure, are collected in real time by various devices. The acquired data are transferred to an external hub or station. The wearable devices allow doctors or physical trainers to monitor patients and provide spontaneous action as needed. This is known as off-body channel communication, which requires an antenna with acceptable gain and directional radiation pattern. Various types of wearable antennas are proposed for off-body communications [1][2][3][4][5][6][7][8][9][10][11][12][13]. However, all these antennas have linear polarization (LP), which may lead to polarization mismatch caused by the constant movement of the human body. To tackle this issue, circularly polarized antennas that have been used as wearable antennas can be adopted to mitigate polarization mismatch [14][15][16][17][18][19][20][21]. The other communication establishes the internal links between the wearable devices on the body, called on-body channel communication, that requires an antenna with omnidirectional radiation pattern to suppress the radiation in unwanted directions. Various kinds of on-body communication antennas have been presented [22][23][24][25][26][27][28]. Both on-body and off-body communications require the antenna with compact size, high efficiency, low specific absorption rate (SAR), and comfortability to wearers. When nodes on the body communicate each other, ac...

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Omni-Directional Circularly Polarized Button Antenna for 5 GHz WBAN Applications

Cited by 36 publications

References 21 publications

Dual-Band 6 × 6 MIMO Antenna System for Glasses Applications Compatible with Wi-Fi 6E and 7 Wireless Communication Standards

Dual-Band 6 × 6 MIMO Antenna System for Glasses Applications Compatible with Wi-Fi 6E and 7 Wireless Communication Standards

Flexible and Transparent Circularly Polarized Patch Antenna for Reliable Unobtrusive Wearable Wireless Communications

Wearable Pattern-Diversity Dual-Polarized Button Antenna for Versatile On-/Off-Body Communications

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