Stretchable 5 GHz Dipole Antenna Using Silver Composite Material

A highly stretchable small-size 5 GHz dipole antenna is presented for wearable and mobile applications. A stretchable dipole antenna was fabricated using conductive polymer composite material composed of Ag flake filler and polyester binder. The dipole antenna was printed on a stretchable polyurethane substrate using a simple and inexpensive screen-printing technique. The stretchability and durability of the dipole antenna were evaluated by the stretching and cyclic stretching tests. The stretchable dipole antenna showed excellent stretchability and RF performances up to a tensile strain of 25%. The stretchable dipole antenna also exhibited outstanding mechanical durability in the 10,000-cycle cyclic stretching endurance tests.

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Highly Stretchable and Durable Nanocomposite Bow-Tie Antenna for Wearable Application

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19134 ◽

2021 ◽

Vol 21 (5) ◽

pp. 2980-2986

Author(s):

Ji Hun Yuk ◽

Inmu Kim ◽

Hyun Jin Nam ◽

Sung-Hoon Choa

Keyword(s):

The Body ◽

Wearable Electronics ◽

Cyclic Stretching ◽

Screen Printing Technique ◽

Bending Radius ◽

Highly Stretchable ◽

Rf Performance ◽

5 Ghz ◽

Bow Tie ◽

Rf Performances

We present a highly stretchable and compact bow-tie antenna which operates at 5 GHz for wearable applications. The dimensions of the bow-tie antenna were 7.9 mm×17.8 mm. The stretchable antenna was fabricated with a composite mixture of silver flake and polymer binder. The composite paste was printed on polyurethane and textile using the screen printing technique. The RF performances, stretchability, bendability, and durability of the antennas were evaluated, which are critical requirements in wearable electronics. The stretchable bow-tie antennas showed excellent RF performances and stretchability up to a stretching strain of 40%. The antennas could be bent up to a bending radius of 20 mm without degrading RF performance. The stretchable antennas also exhibited outstanding mechanical endurance after 10,000 cyclic stretching tests. The antennas were not affected by the presence of the body and showed very stable RF performances, exhibiting promising results for mobile and wearable applications.

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The influence of magnetic fiber orientation on the electric properties of conductive polymer composite material by using magnetic-assisted injection molding

10.1063/1.5088321 ◽

2019 ◽

Author(s):

Shia-Chung Chen ◽

Chen-Yuan Chung ◽

Ya-Lin Tseng

Keyword(s):

Composite Material ◽

Injection Molding ◽

Polymer Composite ◽

Fiber Orientation ◽

Conductive Polymer ◽

Polymer Composite Material ◽

Electric Properties ◽

Conductive Polymer Composite

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The Effect of Temperature and Content of Conductive Filler on the Conductivity of Conductive Rubber

Materials Science Forum ◽

10.4028/www.scientific.net/msf.575-578.1335 ◽

2008 ◽

Vol 575-578 ◽

pp. 1335-1337

Author(s):

Ting Tai Wang ◽

Yu Guang Zhang ◽

Lin Feng Yang ◽

Jing Chang Zhang ◽

Sheng Man Liu

Keyword(s):

Composite Material ◽

Polymer Composite ◽

Conductive Polymer ◽

Conductive Filler ◽

Resistance Rate ◽

Polymer Composite Material ◽

Nitrile Rubber ◽

Effect Of Temperature ◽

Conductive Polymer Composite ◽

Volume Resistance

How the volume resistance rate of the conductive polymer composite material such as nitrile rubber (NBR) filled with ACET changes with temperature is studied. How the volume resistance rate of different conductive polymer composite material is affected by the content of ACET is studied. Such cases are then explained theoretically.

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Highly Stretchable Conductive Electrode Composed of Silver Flake and Ecoflex

Science of Advanced Materials ◽

10.1166/sam.2020.3667 ◽

2020 ◽

Vol 12 (4) ◽

pp. 571-576

Author(s):

Jin Yeong Park ◽

Hyun Jin Nam ◽

Won Jae Lee ◽

Sung-Hoon Choa

Keyword(s):

Electrical Conductivity ◽

Composite Material ◽

Carbon Black ◽

Ethylene Oxide ◽

Electronic Devices ◽

Silver Flake ◽

Electromechanical Properties ◽

Cyclic Stretching ◽

Stretchable Electrode ◽

Highly Stretchable

Stretchable electronic devices commonly require interconnectors with high stretchability, conductivity, and durability. In this work, we demonstrated a highly stretchable electrode based on a composite of silver (Ag) flake filler and Ecoflex binder. The stretchable composite material was printed on polyurethane substrate. To improve the dispersibility and printability of the composite material, poly(dimethylsiloxane-ethylene oxide polymeric) was used. The effects of Ag flake content and Ecoflex binder materials on the electromechanical properties of the stretchable electrode were investigated via stretching and cyclic stretching tests. As the amount of Ag flake increased, the electrical conductivity of the electrode increased as well, but the stretchability decreased. Use of Ecoflex 00-10 material, with its softer and lower Young's modulus, greatly improved the stretchability of the electrode—allowing it to stretch to a strain of up to 120%. The stretchable electrode withstood repetitive cyclic stretching durability tests of 10,000 cycles. The addition of carbon black also had a great impact on its electromechanical properties. An electrode fabricated with 0.2 wt% carbon black showed the highest conductivity and excellent stretchability of more than 150%.

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Flexible conductive polymer composite material based on strutted graphene foam

Composites Communications ◽

10.1016/j.coco.2021.100757 ◽

2021 ◽

pp. 100757

Author(s):

Xiangfen Jiang ◽

Chenyang Xu ◽

Tiao Gao ◽

Yoshio Bando ◽

Dmitri Golberg ◽

...

Keyword(s):

Composite Material ◽

Polymer Composite ◽

Conductive Polymer ◽

Polymer Composite Material ◽

Graphene Foam ◽

Conductive Polymer Composite

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Effect of Magnetic Field on the Fiber Orientation during the Filling Process in Injection Molding, Part 2: Experiments and Electrical Conductivity Measurements

Materials Science Forum ◽

10.4028/www.scientific.net/msf.936.136 ◽

2018 ◽

Vol 936 ◽

pp. 136-141 ◽

Cited By ~ 2

Author(s):

Shia Chung Chen ◽

Chen Yuan Chung ◽

Ya Lin Tseng

Keyword(s):

Magnetic Field ◽

Composite Material ◽

External Magnetic Field ◽

Injection Molding ◽

Polymer Composite ◽

Fiber Orientation ◽

Conductive Polymer ◽

Polymer Composite Material ◽

Filling Process ◽

Conductive Polymer Composite

Conductive polymer composite material has been widely used in many industrial fields. Regarding fibrillar composite material, since the fiber’s orientation and distribution affect the properties of product, how the orientation and distribution are controlled is an important key to improve its properties. In this study, the external magnetic field was applied to injection molding for controlling the orientated behavior of magnetic fiber during the filling process. In addition, the fiber orientation and through-plane conductivity was investigated by means of different injection speeds with or without external magnetic field. The influence of magnetic field on the orientation of fiber was observed using the scanning electron microscope. Results from this paper are expected to provide the important references for future study of conductive polymer composite material by using magnetic-assisted injection molding.

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The Influence of Magnetic Fiber Orientation on the Electric Properties of Conductive Polymer Composite Material by Using Magnetic-Assisted Injection Molding

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.825.114 ◽

2019 ◽

Vol 825 ◽

pp. 114-122

Author(s):

Chen Yuan Chung ◽

Shia Chung Chen ◽

Kuan Ju Lin

Keyword(s):

Magnetic Field ◽

Composite Material ◽

External Magnetic Field ◽

Injection Molding ◽

Conductive Polymer ◽

Modern Science ◽

Polymer Composite Material ◽

Process Conditions ◽

Melt Temperature ◽

Injection Speed

With the evolution of modern science and technology, composite material is widely used in more and more fields. Its related fabrication and technology have become the important issue of development of science and engineering. Especially for fibrillar composite material, since the fiber’s orientation and distribution affect the properties of product, how the orientation and distribution are controlled is an important key to improve its properties. In this study, the external magnetic field is applied to injection molding for controlling the orientated behavior of metal fiber during the filling process. In addition, the fiber’s orientation and conductivity will be investigated by means of different process conditions (melt temperature, mold temperature, injection speed, and so on) with or without external magnetic field.

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