Miniaturization of a Dual-Band Wearable Antenna for WBAN Applications

Le, Tuan Tu; Yun, Tae‐Yeoul

doi:10.1109/lawp.2020.3005658

Cited by 78 publications

(53 citation statements)

References 13 publications

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“…where X is the parameter space, typically determined by the lower and upper bounds for antenna geometry parameters x. It should be noted that without the penalty function approach, the design task would be subject to additional constraints (1). Whereas, when using (1)-(3), it becomes an unconstrained problem, apart from the aforementioned box constraints.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Accommodation along with the integration requirements of antennas with the circuit parts has rendered miniaturization a necessity in applications such as wireless communications, internet of things, or portable and on-body devices [1,2]. As the majority of antenna performance figures (reflection, gain, bandwidth, radiation efficiency, radiation pattern) are linked to the physical size [3], a miniaturization task is far from trivial.…”

Section: Introductionmentioning

confidence: 99%

“…Miniaturization techniques based on utilization of high-permittivity substrates [3,4], have been successful in reducing the antenna size at the expense of degrading the bandwidth. Several other techniques based on geometrical modifications of the antenna structure have been proposed, including the use of meandered traces [1,5], introduction of corrugations in the ground plane and the radiator [6,7], or incorporation of L-shaped slits [1].…”

Section: Introductionmentioning

confidence: 99%

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Optimization-Based Antenna Miniaturization Using Adaptively Adjusted Penalty Factors

Mahrokh

Koziel

2021

Electronics

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The continuing trend for miniaturization of electronic devices necessitates size reduction of the comprising components and circuitry. Specifically, integrated circuit-antenna modules therein require compact radiators in applications such as 5G communications, implantable and on-body devices, or internet of things (IoT). The conflict between the demands for compact size and electrical and field performance can be mitigated by means of constrained numerical optimization. Evaluation of performance-related constraints requires expensive electromagnetic (EM) analysis of the system at hand; therefore, their explicit handling is inconvenient. A workaround is the penalty function approach where the primary objective (typically, antenna size) is complemented by additional terms quantifying possible constraint violations. The penalty coefficients that determine contributions of these terms are normally adjusted manually, which hinders precise control over antenna performance figures and often leads to inferior results in terms of achieved miniaturization rates. This paper proposes a novel algorithm featuring an automated adjustment of the penalty factors throughout the optimization process. Our methodology is validated using three broadband antenna structures. The obtained results demonstrate that the presented adaptive adjustment permits a precise control over the constraint violations while leading to better miniaturization rates as compared to manual penalty term setup.

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Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization-Based Antenna Miniaturization Using Adaptively Adjusted Penalty Factors

Mahrokh

Koziel

2021

Electronics

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“…Wearable antennas, as a vital component in WBAN systems, enable wireless communication with other devices on or off human bodies [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. Compared to traditional antennas, the design of wearable antennas are facing many development bottlenecks: The electromagnetic coupling between the human body and the antenna, the varying physical deformations, the widely varying operating environments, and limitations of the fabrication process [ 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, novel forms of flexible devices such as a fully inkjet-printed antenna [ 30 , 31 ], a polydimethylsiloxane (PDMS)-based antenna [ 21 , 22 ], embroidery [ 32 ], and a silicone-based antenna [ 33 ], and devices combined with new design methods such as substrate-integrated waveguide (SIW) technology [ 34 ], miniature feeding network [ 23 ], magneto-electric dipole [ 35 ], characteristic mode theory [ 27 , 36 , 37 ], textile-type indium gallium zinc oxide (IGZO)-based transistors [ 30 ], and thin-film transistor technologies [ 24 ], are presented for special application scenarios. Furthermore, miniaturization methods, such as inductor/capacitor-loaded antennas [ 38 , 39 , 40 ], loop antennas [ 41 ], and planar inverted F antennas (PIFA) [ 42 , 43 ] are involved in WBAN devices design, which is helpful to improve the design flexibility of the wearable antennas.…”

Section: Introductionmentioning

confidence: 99%

Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

2020

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Wireless Body Area Network (WBAN) has attracted more and more attention in many sectors of society. As a critical component in these systems, wearable antennas suffer from several serious challenges, e.g., electromagnetic coupling between the human body and the antennas, different physical deformations, and widely varying operating environments, and thus, advanced design methods and techniques are urgently needed to alleviate these limitations. Recent developments have focused on the application of metamaterials in wearable antennas, which is a prospective area and has unique advantages. This article will review the key progress in metamaterial-based antennas for WBAN applications, including wearable antennas involved with composite right/left-handed transmission lines (CRLH TLs), wearable antennas based on metasurfaces, and reconfigurable wearable antennas based on tunable metamaterials. These structures have resulted in improved performance of wearable antennas with minimal effects on the human body, which consequently will result in more reliable wearable communication. In addition, various design methodologies of meta-wearable antennas are summarized, and the applications of wearable antennas by these methods are discussed.

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Design of flexible dual‐band antenna and metamaterial structure for wearable body area network

Zheng

Liu

et al. 2022

Int J RF Mic Comp-Aid Eng

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To adapt to the application of wireless body area network (WBAN), a wearable flexible dual-band antenna is developed, which has a compact size of 17 Â 29 Â 0.15 mm 3 and a better bandwidth of 61.2% and 43.1% at 2.4 and 5.8 GHz, respectively. The dual-band characteristic is achieved by slotting technique without changing the contour size. A dual-band metamaterial structure (MS) is designed to improve radiation performance and reduce the specific absorption rate (SAR) of the proposed antenna. To verify the validity of the MS, we build two simulation human models. The forward gain of the antenna is increased and the SAR is significantly decreased when adding the MS between antenna and human skin. The antenna is designed and fabricated on a flexible substrate, and its performance is verified for both flat and curved configurations. To examine its performance as a wearable antenna, it is measured on a human body. The measurements show an excellent agreement with the simulations. Good performances of designed antenna make it potential to application of the miniaturized wearable devices.

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Miniaturization of a Dual-Band Wearable Antenna for WBAN Applications

Cited by 78 publications

References 13 publications

Optimization-Based Antenna Miniaturization Using Adaptively Adjusted Penalty Factors

Optimization-Based Antenna Miniaturization Using Adaptively Adjusted Penalty Factors

Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

Design of flexible dual‐band antenna and metamaterial structure for wearable body area network

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