A miniaturized differentially fed dual-band fractal antenna for in-body communications

Liu, Hui; Liu, Xiong Ying; Fan, Yi

doi:10.1109/imws-amp.2015.7324908

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…However, inappropriate substrates and improper insulating cover might deteriorate the antenna's performance [59]. In [52], the authors proposed a miniaturized differentially fed dual-band fractal antenna for IMD wireless communications. To ensure its biocompatibility, the authors have coated the antenna with a biocompatible coating material, Parylene C, with 𝜀 𝑟 = 2.95 and tan𝛿 = 0.013.…”

Section: P-issn 2961-8932mentioning

confidence: 99%

“…Moreover, the dielectric constant parameters vary according to the frequency. In Table 2, we have presented the dielectric constant parameters of various human tissues in two frequency bands (403 MHz and 2.44 GHz) [52]. The value of these dielectric constant parameters was presented by Yale University [62] according to the Cole-Cole formulation [63] in the Zubal phantom.…”

Section: P-issn 2961-8932mentioning

confidence: 99%

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Recent Trends in Fractal Antenna Research for In-body Communications

Amri

Faqih

2022

BST

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Fractal structure is a unique geometry that can be seen in many objects in nature, such as clouds, coastlines, DNA, trees, and even pineapple. This structure has manifold geometries, self-similarities, and space-filling properties. Due to these properties, fractal geometries are preferred to miniaturize an antenna in wireless communications. There are many cases that require a small compact antenna, including in-body communications. In this article, we present a review of the recent trends and advancements in fractal antenna research, especially in the miniaturization of implantable antennas for in-body communications. The review is derived from articles that are gathered from online libraries such as IEEE, PubMed, Nature, MDPI, Elsevier, and Google Scholar. As a result, we have collected more than 60 articles related to fractal-implantable antenna and in-body communications. Indeed, many researchers have proposed an implantable compact antenna with fractal geometries in the last decades. Fractal geometry allows a longer electrical length to be routed in a smaller area of the antenna. However, several things remain challenging in designing a fractal antenna, including bandwidth, fabrication complexity, and intercell interference.

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Section: P-issn 2961-8932mentioning

confidence: 99%

Section: P-issn 2961-8932mentioning

confidence: 99%

Recent Trends in Fractal Antenna Research for In-body Communications

Amri

Faqih

2022

BST

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“…The utilization of an EBG structure in combination with the design of a dual-band RFID tag is explored in [24]. Additionally, [25] introduces a dual-band RFID tag design tailored explicitly for body temperature monitoring.…”

Section: Introductionmentioning

confidence: 99%

A Novel Antenna Design of Compact HF and UHF Passive RFID Tags with Interconnected Structure for Energy Harvesting and Tracking Systems

Kawdungta,

Mhunkaew,

Torrungrueng

et al. 2024

International Journal of RF and Microwave Computer-Aided Engine

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We propose a new dual-band passive RFID tag antenna design by combining a rectangular spiral coil and patch-meander-line dipole with an interconnected structure. This design enables operation in high-frequency (HF) and ultra-high-frequency (UHF) RFID systems, suitable for energy harvesting and tracking applications. The simulations by the CST full-wave software demonstrate conjugate impedance matching between the tag antenna and two RFID tag chips. At 13.56 MHz (HF), the tag antenna exhibits an inductive reactance of 422.79 Ω, while at 922.5 MHz (UHF), it presents an impedance of 9.41+j174.96 Ω. The antenna generates a maximum magnetic field intensity of 0.5 A/m and omnidirectional electromagnetic fields with an antenna realized gain of -4.26 dBi at 922.5 MHz. We also analyze the impact of the tag antenna combination using numerical software. Furthermore, we fabricate a prototype tag antenna and validate its performance with RFID readers. The proposed tag antenna achieves the maximum read ranges of 11 cm and 6.9 m for the HF (13.56 MHz) and UHF (920-925 MHz) bands, respectively, accompanied by the energy harvesting of 1.48 volts at the HF band by the coupling magnetic field received by the HF antenna to the chip ST25DV04K at the output voltage pin.

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“…Considering differentially fed antennas, in [11], the in-body near-field radiation pattern of an on-body antenna was characterized. In other studies, implantable antennas were considered, like in [12,13], where the in-body radiation patterns and S-parameters were investigated. However, to the authors' knowledge, the experimental characterization of differential antennas on human body, in terms of off-body far-field radiation patterns, which is proposed in the present paper, has received no attention yet in existing literature.…”

Section: Introductionmentioning

confidence: 99%

On-Body Characterization of Planar Differential Antennas for Multiple, Wide, and Narrow Bands

Vallozzi

Pepe

Castel

et al. 2016

International Journal of Antennas and Propagation

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This paper reports the results of the on-body experimental tests of a set of four planar differential antennas, originated by design variations of radiating elements with the same shape and characterized by the potential for covering wide and narrow bands. All the antenna designs have been implemented on low-cost FR4 substrate and characterized experimentally through on-body measurements. The results show the impact of the proximity to the human body on antenna performance and the opportunities in terms of potential coverage of wide and narrow bands for future ad hoc designs and implementations through wearable substrates targeting on-body and off-body communication and sensing applications.

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A miniaturized differentially fed dual-band fractal antenna for in-body communications

Cited by 3 publications

References 6 publications

Recent Trends in Fractal Antenna Research for In-body Communications

Recent Trends in Fractal Antenna Research for In-body Communications

A Novel Antenna Design of Compact HF and UHF Passive RFID Tags with Interconnected Structure for Energy Harvesting and Tracking Systems

On-Body Characterization of Planar Differential Antennas for Multiple, Wide, and Narrow Bands

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