Publication: Single-fed broadband CPW-fed circularly polarized implantable antenna for sensing medical applications
Loading...
Identifiers
Publication date
2023-04-01
Defense date
Advisors
Tutors
Journal Title
Journal ISSN
Volume Title
Publisher
PLOS
Impact
Export
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 co-planar 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.
Description
Keywords
Patch antenna, Wave, Antenna bandwidth design
Bibliographic citation
Butt, A. D., Khan, J., Ahmad, S., Ghaffar, A., Abdullah Al-Gburi, A. J., & Hussein, M. (2023). Single-fed broadband CPW-fed circularly polarized implantable antenna for sensing medical applications. PloS One, 18(4), e0280042.