A reconfigurable flexible fractal‐based monopole antenna for portable applications

Al-Adhami, Ammar; Erçelebi, Ergün

doi:10.1002/dac.4851

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Now, the antenna design is inspired Hilbert curve MTM, 6 see Figure 3A, to provide multiresonances at different bands. The antenna patch is structured from planar MTM array printed on the fabricated INP substrate.…”

Section: Antenna Geometry and Design Methodologymentioning

confidence: 99%

“…Likewise, the relative changes in ΔS 12 increase with the mode number increase for Group_2 and Group_3 as seen in Figure 2B, while the changes in ΔS 12 for Group_1 are found almost constant. Now, from the guide wavelength (λ g ) the stub length (L) of the T-resonator can be calculated 6 as:…”

Section: Substrate Preparation and Characterizationmentioning

confidence: 99%

“…Recently, split ring resonators were applied for mutual coupling reduction between the printed circuit monopoles in MIMO systems 5 and gain-bandwidth enhancements. 6 In Al-Adhami and Erçelebi, 7 another technique was proposed for reducing mutual coupling between antennas in MIMO array using fractal Hilbert-shaped metamaterial (MTM). Electromagnetic band gap (EBG) defects on a partial ground plane were patterned for gain-bandwidth enhancements in Al-Adhami and Erçelebi.…”

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confidence: 99%

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Miniaturized flexible metamaterial antenna of circularly polarized high gain‐bandwidth product for radio frequency energy harvesting

Alaukally

Elwi

Atilla

2021

Int J Communication

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Summary A discussion of using an ultrawide band (UWB) Hilbert‐shaped metamaterial (MTM) antenna structure for RF energy harvesting is exemplified in this article to conduct the use of organic substrates. Therefore, the proposed design is structured as a low profile rectangular MTM array in the context of wearable systems. The antenna is mounted on a prepared indium‐nickel oxide‐based polymerized Palm fiber (INP) substrate and backed with a ground plane of square electromagnetic band gap (EBG) defects. Fifteen samples of INP substrate are prepared for this study. Thus, the prepared INP substrates characterizations are tested using a T‐resonator transmission line technique printed on an FR4 substrate. In this technique, the measured scattering parameters are interpreted from two resonators with two different characteristics impedance to be employed for retrieving the relative permittivity (εr) and permeability (μr). This process is included to ensure the prepared substrate properties controllability for microwave devices manufacturing. After that, the proposed antenna is manufactured from silver nanoparticle (SNP) printout. The performance of the proposed antenna is tested numerically and experimentally. It is found that the proposed antenna shows an UWB response to start from 3 and up to 10 GHz that suits different applications including IoT, 5G, and WiMAX system networks. The measured gain spectrum shows four peaks at 3.5, 4.2, 5.4, and 6 GHz with gain values of 1.1, 2, 3.4, and 3.9 dBi, respectively. Finally, the conversion efficiency of RF harvesting is measured experimentally for the antenna in case of flat profile and bended structure at the frequency bands of interest to reveal insignificant changes.

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Section: Antenna Geometry and Design Methodologymentioning

confidence: 99%

Section: Substrate Preparation and Characterizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Miniaturized flexible metamaterial antenna of circularly polarized high gain‐bandwidth product for radio frequency energy harvesting

Alaukally

Elwi

Atilla

2021

Int J Communication

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“…A better solution is to make the antenna itself flexible. Furthermore, multifunctional antennas like bandwidth-enhanced and reconfigurable antennas [11][12][13][14][15] are in keen demand. In particular, in wearable electronic [16], antennas are expected to be stretchable in the presence of motion and deformation.…”

Section: Introductionmentioning

confidence: 99%

A Highly Transparent Flexible Antenna Based on Liquid Metal Mesh Film

Qin

Wang

Zhang

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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In this paper, a convenient process for the fabrication of flexible liquid metal mesh films (LMMF) is proposed first. Then, the light transmittance and square resistance characteristics of LMMF are studied theoretically and experimentally. The light transmittance of the LMMF can reach 85% when the line width and spacing are 50 μm and 1000 μm, respectively. Furthermore, as an example of LMMF, a coplanar waveguide loop antenna is designed and fabricated that contains an LMMF with a line width of 50 μm and a line spacing of 500 μm. The measured square resistance and transmittance for the LMMF are 0.0456 Ω/sq and 72%, respectively. The measured peak gain of the antenna is 3.38 dBi while the average efficiency is 61%. The antenna’s working frequency covers most of the S-band, C-band, and X-band, as well as multiple channels of fifth generation (5G) communication. Therefore, the antenna can be used in fields such as radar and mobile communication. Uniquely, the fabricated antenna performs well in terms of light transmission, conductivity, and flexibility. In particular, it remains stable in stretching and bending deformation. As a highly light-transmissive stretchable flexible antenna, the antenna is equipped with various functions such as concealability, conformability, and reconfigurability. This LMMF-based antenna has good prospects for applications in the fields of flexible electronics and transparent electronics.

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Reconfigurable fractal antennas for future wireless applications: A comprehensive review

Patel,

Behera

2024

Int J Communication

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SummaryReconfigurable fractal antenna (RFA) design is always necessary for the continued development of wireless communication systems as the antenna is playing a vital part in device performance. The need for efficient radiators that are compact, low‐profile, inexpensive, and low weight has attracted scientists for their research works. As a result, numerous ideas were put forward by the researchers to attempt to resolve these problems by utilizing various kinds of fractal and reconfigurable antennas as well as their combinations. However, it is challenging to have a clear and transparent review of the various works with a large variety of solutions and their uniqueness. The advanced RFA design for wireless applications is reviewed in this study together with its most recent and pertinent counterparts. In Koch RFA, bandwidths enable selective bands spanning 1–6 GHz frequency range. Further, in band RFA design, the overall bandwidth ranges from 1.45 to 4.52 GHz (103%) with low gain; on the other hand, the crescent RFA achieves 5.67 dBi peak gain. Furthermore, in polarization RFA, the ARBWs are 17.61% (2.2–2.62 GHz) and 8.69% (2.91–3.18 GHz). The Hilbert RFA operates at 0.9 and 2.45 GHz with gains of 3.1 and 7 dBi, respectively. This article investigates a comprehensive review of the requirements for RFAs for wireless applications. Furthermore, a comparative study on different reconfigurability with switching techniques, fractal geometries, various RFA design approaches to enhance device performance, and their significance is discussed. Existing research challenges and future directions are also discussed as part of this article.

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A reconfigurable flexible fractal‐based monopole antenna for portable applications

Cited by 6 publications

References 28 publications

Miniaturized flexible metamaterial antenna of circularly polarized high gain‐bandwidth product for radio frequency energy harvesting

Miniaturized flexible metamaterial antenna of circularly polarized high gain‐bandwidth product for radio frequency energy harvesting

A Highly Transparent Flexible Antenna Based on Liquid Metal Mesh Film

Reconfigurable fractal antennas for future wireless applications: A comprehensive review

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