Single-fed broadband CPW-fed circularly polarized implantable antenna for sensing medical applications

Ahmad, Sarosh and Hussein, Mousa and Khan, Jalal and Ghaffar, Adnan and Al Gburi, Ahmed Jamal Abdullah and Butt, Arslan Dawood (2023) Single-fed broadband CPW-fed circularly polarized implantable antenna for sensing medical applications. PLOS ONE, 18 (4). pp. 1-20. ISSN 1932-6203

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Abstract

Biomedical telemetry relies heavily on implantable antennas. Due to this, we have designed and tested a compact, a circularly polarized, a low-profile biomedical implantable antenna that operate in the 2.45 GHz ISM band. In order to keep the antenna compact, modified coplanar waveguide (CPW) technology is used. Slotted rectangular patch with one 45-degree angle slot and truncated little patch on the left end of the ground plane generate a frequency-range antenna with circular polarization. Using a 0.25-millimeter-thick Roger Duroid-RT5880 substrate with a thickness of εr = 2.2, tanδ = 0.0009 provides flexibility. The volume of the antenna is 21 mm x 13.5 mm x 0.254 mm (0.25λg × 0.16λg × 0.003λg). The antenna covers 2.35–2.55 GHz (200 MHz) in free space and 1.63–1.17 GHz (1.17 GHz) in epidermal tissue. With skin tissue that has more bandwidth, the (x and y)-axis bends of the antenna are also simulated via the simulation. Bended antenna simulations and measurements show excellent agreement. At 2.45 GHz, the skin-like gel had -10dB impedance and 3dB axial ratio (AR) bandwidths of 47.7 and 53.8%, respectively. The ultimate result is that the SAR values are 0.78 W/kg in skin over 1 g of bulk tissue, as determined by simulations. The suggested SAR values are lower than the FCC’s maximum allowable limit (FCC). This antenna is small enough to be implanted in the body, making it perfect for biomedical applications.

Item Type:	Article
Uncontrolled Keywords:	Computer simulation, Electric impedance, Equipment design, Telemetry, Wireless technology
Divisions:	Faculty Of Electronics And Computer Technology And Engineering
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	08 Oct 2025 00:46
Last Modified:	08 Oct 2025 00:46
URI:	http://eprints.utem.edu.my/id/eprint/28969
Statistic Details:	View Download Statistic

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