Natural rubber composites containing low and high dielectric constant fillers and their application as substrates for compact flexible antennas

Al‐Sehemi, Abdullah G.; Al-Ghamdi, Ahmed A.; Dishovsky, Nikolay; Malinova, Petrunka; Atanasov, Nikolay; Atanasova, Gabriela

doi:10.1177/0967391120910879

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…For the antenna substrate, a composite, composed of a mixture of natural rubber and TiO 2 as a filler (NR-TiO 2 ), was fabricated according to the procedure outlined in [ 10 , 38 ] and then was vulcanized to form a plate with dimensions 150 mm × 150 mm × 2.5 mm.…”

Section: Methods Models and Materialsmentioning

confidence: 99%

A Flexible Miniature Antenna for Body-Worn Devices: Design and Transmission Performance

et al. 2023

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The last few years have seen a rapid increase in body-worn devices because these devices cover a broad spectrum of potential uses. Moreover, body-worn devices still require improvements in their flexibility, size, and weight that necessitate the development of flexible and miniature antennas. In this paper, we present a new flexible miniature antenna for body-worn devices. To ensure flexibility and comfort when the antenna is in contact with the human body, a substrate from natural rubber filled with TiO2 is developed. The miniaturization is achieved using the quadratic Koch curve. The antenna design, optimization, and characterization are performed on a human body model. The performance of the antenna is analyzed in two scenarios: (1) in- to on-body, and (2) on- to off-body wireless communications. The results show that the antenna realized the maximum telemetry range of more than 80 mm for in-body communications and more than 2 m for off-body communications. Moreover, the highest 10 g specific absorption rate value was 0.62 W/kg. These results, in addition to the antenna’s compact dimensions (12 mm × 26 mm × 2.5 mm) and the low manufacturing price, make the proposed antenna an ideal candidate for health telemetry applications.

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Section: Methods Models and Materialsmentioning

confidence: 99%

A Flexible Miniature Antenna for Body-Worn Devices: Design and Transmission Performance

et al. 2023

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“…[130] Similarly, modifications of BT and other dielectric fillers (e.g., TO) were extensively studied in combination with NR to yield satisfactory electro-mechanical sensitivity. [131] F I G U R E 1 3 (A) The dielectric constant, (B) actuated strain of natural rubber (NR) composites filled with different amounts of barium titanate (BT) and dioctyl phthalate (DOP) and VHB 4910. [132] Copyright 2019 AIP Publishing.…”

Section: Natural Rubbermentioning

confidence: 99%

The role of chemical microstructures and compositions on the actuation performance of dielectric elastomers: A materials research perspective

et al. 2023

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Dielectric elastomer actuators (DEAs) are one of the emerging areas of investigation in smart elastomer research and have attracted considerable interests due to their wide‐ranging applications, for instance in automation and soft robotic components. Commonly utilized dielectric elastomers (DEs) such as nitrile butadiene rubber (NBR) and its hydrogenated and carboxylated derivatives along with the dielectric fillers (titanium oxide, barium titanate, etc.) were considered to be one of the most established composite systems demonstrating high actuation performance. When subjected to external electrical field, the DEAs derived from the composites were, therefore, capable of reproducing high energy density and large deformation with fast response time. The recent research emphasizes that tunable material properties eventually triggered the improved actuation performance. The exploration of compliant electrodes fabricated by the conventional and state‐of‐the‐art lithographic methods was also crucial to improve actuation performance for the soft robotic applications. This review summarizes the commonly used DEs and dielectric fillers, their performances and challenges, and outlines the research progress (experimental and theoretical) in the field of actuators. Finally, a brief introduction to DEA‐based soft robotics application is also presented.

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“…Flexible substrates need to have a high degree of deformability and high mechanical strength, and a wide variety of substrates can be used, such as fabric [5], leather [6], paper [7], natural rubber [8], and synthetic materials [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Multi-frequency composite wearable antenna for wireless communications

Shi,

Duan,

Zhang

et al. 2024

Smart Mater. Struct.

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This paper proposes a multi-band composite wearable antenna for wireless communication, which uses a monopole structure as the radiating body and achieves multi-band characteristics through slit-loading and multi-branching methods. A polymer composite substrate with high dielectric constant and low dielectric loss was prepared using in situ polymerization, and the optimal dielectric constant and loss angle tangent were obtained by controlling the coating ratio of melamine formaldehyde resin (MF) to carbon nanotubes (MWCNTs) and the filler doping rate to achieve miniaturization of the antenna. Comparative experimental results show that the obtained composites have high flexibility and good dielectric properties. The antenna operates in the frequency bands of 2.21-2.52GHz, 3.07-3.87 GHz, and 4.36-6.03 GHz, which cover the frequency bands of WLAN and WiMAX and 5G applications. The antenna was fabricated and tested, and its performance roughly matched the simulation results. Meanwhile, the antenna has passed the SAR safety test and maintained a stable performance under different curvatures, so it has potential applications in the wireless communication system.

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Natural rubber composites containing low and high dielectric constant fillers and their application as substrates for compact flexible antennas

Cited by 8 publications

References 32 publications

A Flexible Miniature Antenna for Body-Worn Devices: Design and Transmission Performance

A Flexible Miniature Antenna for Body-Worn Devices: Design and Transmission Performance

The role of chemical microstructures and compositions on the actuation performance of dielectric elastomers: A materials research perspective

Multi-frequency composite wearable antenna for wireless communications

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