Compact Circularly Polarized Wearable Button Antenna With Broadside Pattern for U-NII Worldwide Band Applications

Hu, Xiaomu; Yan, Sen; Vandenbosch, Guy A. E.

doi:10.1109/tap.2018.2885210

Cited by 61 publications

(43 citation statements)

References 15 publications

(16 reference statements)

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“…The proposed antenna has been excited with both straight and bend ground plane. Similarly the wearable DRA has been tested on conductive textile ground plane, with thickness of 0.17mm and 1.18 × 10 5 S/m [38]. As shown a good impedance matching i.e.…”

Section: A Return Losses Of the Wearable Dramentioning

confidence: 99%

Design of New Circularly Polarized Wearable Dielectric Resonator Antenna for Off-Body Communication in WBAN Applications

et al. 2019

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A unique circularly polarized (CP) compact wearable dielectric resonator antenna (DRA) has been proposed for off-body communication in wireless body area network (WBAN) applications. The design is singly fed and a new H-shaped conformal metal strip has been used to excite the DRA. A circular polarization over a bandwidth of ∼9.6% (7.47-8.25 GHz) in conjunction with an impedance matching bandwidth of ∼20.7% (6.95-8.68 GHz) has been offered by the antenna. A prototype has been fabricated and measured. The antenna has been tested both in free space and on-body environment. A robust performance has been offered by the antenna against human body lossy effects. The measured results agree very well with the simulated results.INDEX TERMS Wireless body area network, ultra-wideband, dielectric resonator antenna, circular polarization, off-body communication, specific absorption rate.

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Section: A Return Losses Of the Wearable Dramentioning

confidence: 99%

Design of New Circularly Polarized Wearable Dielectric Resonator Antenna for Off-Body Communication in WBAN Applications

et al. 2019

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“…Additionally, SAR of 0.45 W/kg at 20 dBm (input power) was obtained. In [ 276 ], a novel circularly polarized button shape antenna was designed for a broadside pattern at 5.47–5.725 GHz (UNII Band), as shown in Figure 9 b. The design was based on a button-shaped FR4 substrate with a radiating element on both sides.…”

Section: Wearable Antenna Designsmentioning

confidence: 99%

“… ( a ) Wideband button [ 275 ], ( b ) circularly-polarized button [ 276 ], ( c ) F-inverted button [ 279 ], and ( d ) array button antenna [ 280 ]. …”

Section: Figurementioning

confidence: 99%

Recent Advances of Wearable Antennas in Materials, Fabrication Methods, Designs, and Their Applications: State-of-the-Art

et al. 2020

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The demand for wearable technologies has grown tremendously in recent years. Wearable antennas are used for various applications, in many cases within the context of wireless body area networks (WBAN). In WBAN, the presence of the human body poses a significant challenge to the wearable antennas. Specifically, such requirements are required to be considered on a priority basis in the wearable antennas, such as structural deformation, precision, and accuracy in fabrication methods and their size. Various researchers are active in this field and, accordingly, some significant progress has been achieved recently. This article attempts to critically review the wearable antennas especially in light of new materials and fabrication methods, and novel designs, such as miniaturized button antennas and miniaturized single and multi-band antennas, and their unique smart applications in WBAN. Finally, the conclusion has been drawn with respect to some future directions.

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“…When the antenna is worn on the human body, it is exposed to a large volume of lossy material in its immediate vicinity. This degrades the performance by converting the near electric field of the antenna into the heat energy [18], [19]. Moreover, the polarization mismatch losses further degrade the antenna performance in body-centric applications, especially when linearly polarized (LP) antennas are involved.…”

Section: Introductionmentioning

confidence: 99%

Enhanced-Performance Circularly Polarized MIMO Antenna With Polarization/Pattern Diversity

2020

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Design of a compact wideband circularly polarized (CP) multiple-input multiple-output (MIMO) antenna with polarization diversity is proposed and characterized for off-body communication. The antenna is based on a simple coplanar waveguide (CPW)-fed monopole extension of the microstrip line. The orthogonal field components required by CP are induced using a simply modified right/left side ground plane. In particular, a stub extending from the ground plane along the length of the microstrip line generates the vertical component, whereas the current along the width of the ground plane contributes to the horizontal components. To obtain a unidirectional radiation pattern in the off-body direction and to reduce the sensitivity to the human body loading effects, a flat reflector printed on a high permittivity flexible substrate is applied. The simple topology of the antenna can be described by a few adjustable parameters, which facilitates its EM design closure. Prior to the experimental validation in the free space and on the body, the antenna is optimized at the full-wave level of description for all major performance figures. The overall footprint of the antenna radiator is only L s × W s = 0.24 λ 0 × 0.64 λ 0 = 0.15 λ 2 0. The proposed MIMO antenna features |S 11 | ≤ −10 dB, average isolation |S 21 | ≤ −22 dB, and axial ratio (AR) ≤ 3 dB from 5.2 GHz to 6.3 GHz with 100% bandwidth overlap between the impedance and axial ratio bandwidths. The envelope correlation coefficient (ECC) is less than 0.004 with the maximum diversity gain (DG) of approximately 9.99 dB. Moreover, the antenna maintains a high efficiency of up to 90% when loaded on the body, and a low specific absorption rate (SAR). INDEX TERMS Circular polarization antennas, MIMO antennas, compact antennas, wideband antennas, simulation-driven design.

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Compact Circularly Polarized Wearable Button Antenna With Broadside Pattern for U-NII Worldwide Band Applications

Cited by 61 publications

References 15 publications

Design of New Circularly Polarized Wearable Dielectric Resonator Antenna for Off-Body Communication in WBAN Applications

Design of New Circularly Polarized Wearable Dielectric Resonator Antenna for Off-Body Communication in WBAN Applications

Recent Advances of Wearable Antennas in Materials, Fabrication Methods, Designs, and Their Applications: State-of-the-Art

Enhanced-Performance Circularly Polarized MIMO Antenna With Polarization/Pattern Diversity

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