Stretchable dipole antenna for body area networks at 2.45 GHz

Arriola, Aitor; Sancho, Juan Ignacìo; Brebels, S.; González, Miguel A.; Raedt, W. De

doi:10.1049/iet-map.2010.0436

Cited by 34 publications

(18 citation statements)

References 14 publications

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“…To the best of our knowledge, as shown in Table S4 in the Supporting Information, most of the reported stretchable antennas suffered from dramatic decrease of reflection | S 11 | under large strains (>100%). In comparison, our S‐MXene antenna was highly stretchable (up to 150%), and the relative changes of reflection | S 11 | were smaller (9% under 100% strain, and 20% under 150% strain) than the values reported in the literature 5,7b,19i,25. To further quantify the mechanical stability of our S‐MXene antenna in terms of reflection changes under different strains, we further calculated the quality factors ( Q antenna ) by following Equation ,

Q_{antenna} = ([], false(L_{ε} - L_{0} false) / L_{0}) / ([], ((||, S_{11, ε}) - (||, S_{11, 0})) / |S_{11, 0}|)

where L 0 and L ε are the length of antenna before and after stretching, and | S 11,0 | and | S 11, ε | are the corresponding reflection, respectively.…”

Section: Resultscontrasting

confidence: 68%

Reversible Crumpling of 2D Titanium Carbide (MXene) Nanocoatings for Stretchable Electromagnetic Shielding and Wearable Wireless Communication

Yang

Tian

Gao

et al. 2019

Adv Funct Materials

171

134

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In the emerging Internet of Things, stretchable antennas can facilitate wireless communication between wearable and mobile electronic devices around the body. The proliferation of wireless devices transmitting near the human body also raises interference and safety concerns that demand stretchable materials capable of shielding electromagnetic interference (EMI). Here, an ultrastretchable conductor is fabricated by depositing a crumple-textured coating composed of 2D Ti 3 C 2 T x nanosheets (MXene) and single-walled carbon nanotubes (SWNTs) onto latex, which can be fashioned into high-performance wearable antennas and EMI shields. The resulting MXene-SWNT (S-MXene)/latex devices are able to sustain up to an 800% areal strain and exhibit strain-insensitive resistance profiles during a 500-cycle fatigue test. A single layer of stretchable S-MXene conductors demonstrate a strain-invariant EMI shielding performance of ≈30 dB up to 800% areal strain, and the shielding performance is further improved to ≈47 and ≈52 dB by stacking 5 and 10 layers of S-MXene conductors, respectively. Additionally, a stretchable S-MXene dipole antenna is fabricated, which can be uniaxially stretched to 150% with unaffected reflected power <0.1%. By integrating S-MXene EMI shields with stretchable S-MXene antennas, a wearable wireless system is finally demonstrated that provides mechanically stable wireless transmission while attenuating EM absorption by the human body.existing mobile devices. [1] To enable highperformance wireless communication between wearable sensors, displays, and data processing devices around the body, new routes to fabricating for stretchable antennas that exhibit mechanically stable performance are needed. Furthermore, the proliferation of mobile and wearable devices based on various wireless technologies, including GPS, Bluetooth, Wi-Fi, and near-field communication, is increasing the frequency and duration of the human body exposed to electromagnetic (EM) fields, which raises interference and safety concerns that may require certain suitable materials for EM protection. [2] Therefore, in addition to the growing demand for stretchable antennas, electromagnetic interference (EMI) shielding materials that are stretchable, durable, and can be integrated closely with wearable wireless technologies are needed to reduce the exposure of the human body to EM fields. Integrating such stretchable antennas with on-site EMI shields not only provides protection against EM fields, but also prevents unauthorized wireless transmission between wearable electronics and mobile devices for enhanced wireless privacy.Both wearable antennas and stretchable EMI shields face similar technological challenges, where the key materials awaiting to be developed are the stretchable conductors with high strain tolerance and strain-invariant electrical conductivities.Metals (e.g., Cu and Al) are the conventionally used materials for EMI shields and antennas on many occasions. As the trend in today's electronic devices becomes faster, lighter, and...

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Q_{antenna} = ([], false(L_{ε} - L_{0} false) / L_{0}) / ([], ((||, S_{11, ε}) - (||, S_{11, 0})) / |S_{11, 0}|)

where L 0 and L ε are the length of antenna before and after stretching, and | S 11,0 | and | S 11, ε | are the corresponding reflection, respectively.…”

Section: Resultscontrasting

confidence: 68%

Reversible Crumpling of 2D Titanium Carbide (MXene) Nanocoatings for Stretchable Electromagnetic Shielding and Wearable Wireless Communication

Yang

Tian

Gao

et al. 2019

Adv Funct Materials

171

134

View full text Add to dashboard Cite

show abstract

“…Comparison of the return loss of the antenna at different strains with typical literature results was listed in Figure 6a and Table S4 (Supporting Information). [10,29,[48][49][50] Our antenna showed much lower return loss for the investigated strains compared with literature results. Figure 6b shows the strain dependence of the percent change of return loss ΔS 11 /S 11max = (S 11 (ε) − S 11max )/S 11max , where S 11 (ε) and S 11max are the return losses at strain (ε) and at the maximum strain, respectively.…”

Section: Wwwadvelectronicmatdesupporting

confidence: 44%

A General Approach for Buckled Bulk Composites by Combined Biaxial Stretch and Layer‐by‐Layer Deposition and Their Electrical and Electromagnetic Applications

Liu

Wan

Mou

et al. 2019

Adv Elect Materials

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Fabrication of high quality stretchable conductors that show bulk structure, high electrical conductivity, and stable conductance under large deformations is crucial for wearable electronics and soft robots. A key difficulty here is to introduce buckled structure into the conductive phase of the bulk conductors and overcome the lateral crack problem in the conductive phase during buckle formation. In this paper, a general approach is introduced for fabricating novel buckled bulk composite (BBC) stretchable conductors based on common conductive nanomaterial by using sequential biaxial stretch–release and layer‐by‐layer deposition to provide alternating buckled conductive layers and elastomer layers. This biaxial stretch is used to keep the width of elastomers unchanged before and after stretching, to avoid the lateral crack formation of the conductive layer. This method can be applied to common nanoparticles, such as silver nanoparticles, silver nanowires, single‐walled carbon nanotubes, and graphenes. The BBCs exhibit high conductance, uniform structure, and stable conductance during deformation and temperature change, which are demonstrated as applications in electrical interconnects, electrothermally driven artificial muscles, electromagnetic interference shielding materials, and reconfigurable antennas.

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“…Antenna being a radiative element with a strong dependence on the wavelength of the signal and the shape of the mounting platform must be thoroughly investigated for its performance in such applications. There have been several exciting works showcasing a stretchable antenna in the past . These systems radiate at different resonant frequencies due to a change in length of the antenna on elongation.…”

Section: Introductionmentioning

confidence: 99%

Metal/Polymer Based Stretchable Antenna for Constant Frequency Far‐Field Communication in Wearable Electronics

Hussain

Ghaffar

Park

et al. 2015

Adv Funct Materials

144

105

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Body integrated wearable electronics can be used for advanced health monitoring, security, and wellness. Due to the complex, asymmetric surface of human body and atypical motion such as stretching in elbow, fi nger joints, wrist, knee, ankle, etc. electronics integrated to body need to be physically fl exible, conforming, and stretchable. In that context, state-of-theart electronics are unusable due to their bulky, rigid, and brittle framework. Therefore, it is critical to develop stretchable electronics which can physically stretch to absorb the strain associated with body movements. While research in stretchable electronics has started to gain momentum, a stretchable antenna which can perform far-fi eld communications and can operate at constant frequency, such that physical shape modulation will not compromise its functionality, is yet to be realized. Here, a stretchable antenna is shown, using a low-cost metal (copper) on fl exible polymeric platform, which functions at constant frequency of 2.45 GHz, for far-fi eld applications. While mounted on a stretchable fabric worn by a human subject, the fabricated antenna communicated at a distance of 80 m with 1.25 mW transmitted power. This work shows an integration strategy from compact antenna design to its practical experimentation for enhanced data communication capability in future generation wearable electronics.

show abstract

Stretchable dipole antenna for body area networks at 2.45 GHz

Cited by 34 publications

References 14 publications

Reversible Crumpling of 2D Titanium Carbide (MXene) Nanocoatings for Stretchable Electromagnetic Shielding and Wearable Wireless Communication

Reversible Crumpling of 2D Titanium Carbide (MXene) Nanocoatings for Stretchable Electromagnetic Shielding and Wearable Wireless Communication

A General Approach for Buckled Bulk Composites by Combined Biaxial Stretch and Layer‐by‐Layer Deposition and Their Electrical and Electromagnetic Applications

Metal/Polymer Based Stretchable Antenna for Constant Frequency Far‐Field Communication in Wearable Electronics

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