A Wideband Circularly Polarized Implantable Patch Antenna for ISM Band Biomedical Applications

Xia, Zhilin; Li, Hua; Lee, Zongze; Xiao, Shaoqiu; Shao, Wei; Ding, Xiao; Yang, Xue‐Song

doi:10.1109/tap.2019.2944538

“…The ground plane is slotted to enhance the electric field strength of the antenna, thereby improving its radiation efficiency thereof. In order to protect the radiation safety of the human body and prevent the high dielectric properties of the biological tissue structure from damaging the performance of the antenna, this design uses the dielectric plate which is consistent with the base as the covering layer of the radiation patch, so as to have a good protective effect 10 . The dielectric constant (εr) of the antenna substrate is 10.2, and the loss tangent (tan δ) is 0.0023.…”

Section: Methodsmentioning

confidence: 99%

A compact and miniaturized implantable antenna for ISM band in wireless cardiac pacemaker system

Yang

¹

,

Li

²

,

Qi

³

et al. 2022

Sci Rep

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A tiny and compact implantable antenna for wireless cardiac pacemaker systems is designed. The antenna works in the Industrial Scientific Medical (ISM) frequency band (2.4–2.48 GHz). The size of the antenna is greatly reduced with the adoption of a high dielectric constant medium and a folded meander structure. The volume of the antenna is 4.5 mm3, and the size is only 3 mm × 3 mm × 0.5 mm. Based on the literature research, it was found that the design was the smallest among the same type of implanted antenna. The antenna is optimized and loaded with a defective slotted structure, which improves the efficiency of the overall performance of the antenna and thus the gain thereof. The antenna maintains good impedance matching in the ISM frequency band, covering the entire ISM frequency band. The actual bandwidth of the antenna is 22%, with the peak gain of − 24.9 dBi. The antenna is processed and manufactured in such a manner that the simulation keeps consistent with the actual measurement. In addition, the specific absorption rate of the antenna is also evaluated and analyzed. The result shows that this kind of antenna is the best choice to realize the wireless biological telemetry communication in the extremely compact space of the wireless cardiac pacemaker system.

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“…Compare with the simulated result, the measured |S 11 | result in minced pork shows a good agreement with simulation, whereas in scenario of skin-mimicking gel the |S 11 | slightly shifts to higher frequency. The slight difference in the skinmimicking gel scenario can be caused by the dielectric properties of the measurements is not exactly coincide with the simulation [30], or by the air gap between the antenna and superstrate (there is always exists an air gap in glue layer, which could be avoided only with the use of a highly accurate manufacturing machine [41]). Moreover, the gain and radiation pattern characteristics are measured in a microwave anechoic chamber.…”

Section: Measurement Results and Discussionmentioning

confidence: 99%

An Ultra-Miniaturized Antenna Using Loading Circuit Method for Medical Implant Applications

Nguyen

¹

,

Seo

²

2021

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In this paper, an ultra-miniaturized implantable antenna is proposed for biomedical applications, which operates in frequency of the industrial, scientific, and medical bands of 2.4 GHz. The miniaturization of the proposed antenna is obtained by using a meander line as radiating patch, introducing a 1.2 Ω chip resistor, and two pairs of a rectangle slot are etched on the ground plane to expand the antenna impedance bandwidth. The antenna has an ultra-compact size with a width and length of 2.5 mm and a thickness of 0.64 mm (the total dimension of 2.5 mm × 2.5 mm × 1.28 mm 3 ). To validate the antenna structure, the optimal design is fabricated and experimentally measured. A low loss, flexible, and biocompatible PCB material, Taconic CER-10 (ε r = 10.2, σ = 0.0 035) is adopted as both the substrate and superstrate. The experiment results imply that the proposed antenna produces a good impedance matching at 2.4 GHz with a bandwidth of 16.6 % and a maximum peak gain of -18.3 dBi. In addition, to further prove the performance of the designed biomedical implantable antenna, the effects of a coaxial cable and the simulations in the environment of the human tissue models (head, arm, and leg) are established. The antenna provides a low specific absorption rate (SAR) with the value compliance the IEEE standard safety guidelines. To the best of our knowledge, the proposed antenna is the smallest dimension (in width and length) with high performance compared to previously reported works. Thus, the antenna is a potential candidate and suitable for the biomedical applications.INDEX TERMS Biocompatible, biomedical, chip resistor, meander line, implantable antenna, specific absorption rate (SAR).

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“…The human structure has skin, fat, bone, muscle, and blood tissues. These tissues have different dielectric properties which make it difficult for designing a biocompatible antenna to be utilized for the human body applications [6]. Many in-body antennas are designed for wireless communication at midradio band ranges between 402 and 405 MHz [7][8][9][10][11] and at ISM band ranges between 2.4 and 2.48 GHz [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

X-Shaped Slotted Patch Biomedical Implantable Antenna for Wireless Communication Networks

Ahmad

¹

,

Manzoor

²

,

Naseer

³

et al. 2022

Wireless Communications and Mobile Computing

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Biomedical implantable antennas have a major role in biomedical telemetry applications. Therefore, a compact-size low-profile implantable antenna working in industrial, scientific, and medical (ISM) band at 915 MHz is presented. The presented antenna is a simple slotted patch fed with a coaxial probe of 50 Ω impedance. The patch consists of four slotted resonators printed on a flexible Roger Duroid RT5880 substrate ( ε r = 2.2 , tan δ = 0.0009 ) with the standard thickness of 0.254 mm. The complete volume of the designed antenna is 7 mm × 7 mm × 0.254 mm ( 0.08 λ g × 0.08 λ g × 0.003 λ g ). The antenna covers the bandwidth from 800 MHz to 1 GHz (200 MHz) inside skin tissue. A good agreement between the simulation and measurements of the antenna has been obtained. Finally, the specific absorption rate (SAR) values have also been analyzed through simulations as 8.17 W/kg inside skin over 1 g of mass tissue. The proposed SAR values are less than the limit of the Federal Communications Commission (FCC). This antenna is miniaturized and an ideal applicant for applications in biomedical implants.

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A Wideband Circularly Polarized Implantable Patch Antenna for ISM Band Biomedical Applications

Cited by 74 publications

References 20 publications

A compact and miniaturized implantable antenna for ISM band in wireless cardiac pacemaker system

A compact and miniaturized implantable antenna for ISM band in wireless cardiac pacemaker system

An Ultra-Miniaturized Antenna Using Loading Circuit Method for Medical Implant Applications

X-Shaped Slotted Patch Biomedical Implantable Antenna for Wireless Communication Networks

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