Abstract
Biomedical implantable antennas play a vital role in medical telemetry applications. These types of biomedical implantable devices are very helpful in improving and monitoring patients’ living situations on a daily basis. In the present paper, a miniaturized footprint, thin-profile bear-shaped in-body antenna operational at 915 MHz in the industrial, scientific, and medical (ISM) band is proposed. The design is a straightforward bear-shaped truncated patch excited by a 50-Ω coaxial probe. The radiator is made up of two circular slots and one rectangular slot at the feet of the patch, and the ground plane is sotted to achieve a broadsided directional radiation pattern, imprinted on a Duroid RT5880 roger substrate with a typical 0.254-mm thickness ( ϵr = 2.2, tan δ = 0.0009). The stated antenna has a complete size of 7 mm × 7 mm × 0.254 mm and, in terms of guided wavelength, of 0.027λg × 0.027λg × 0.0011λg. When operating inside skin tissues, the antenna covers a measured bandwidth from 0.86 GHz to 1.08 GHz (220 MHz). The simulations and experimental outcomes of the stated design are in proper contract. The obtained results show that the calculated specific absorption rate (SAR) values inside skin of over 1 g of mass tissue is 8.22 W/kg. The stated SAR values are lower than the limitations of the federal communications commission (FCC). Thus, the proposed miniaturized antenna is an ultimate applicant for in-body communications.
Highlights
Biomedical gadgets are very helpful in different therapies and medical diagnoses
In Ref. [7], the authors presented the compact X-shaped slotted patch antenna of a size of 7 × 7 mm2, but the bandwidth achieved from the antennas was 21.85%, which was less than our proposed design in this paper, and the shape of the design was not as novel compared to our proposed design
While calculating the specific absorption rate (SAR), the existence of human body phantoms must be considered in designing an antenna for biotelemetry applications with high precision
Summary
Biomedical gadgets are very helpful in different therapies and medical diagnoses. Due to this reason, they have attracted the focus of researchers in the past few years. [18] described an alternative in-body antenna to transfer the power wirelessly, operating at 915 MHz. The antenna was 11 × 11 × 1.27 mm in size, printed on a Roger 3010 substrate with a 3.8% impedance bandwidth and a realized gain of roughly −29 dBi. no SAR values were determined, and the antenna’s size remained enormous with a restricted bandwidth. This paper presents a high bandwidth with a small implantable antenna with a size of 7 × 7 × 0.254 mm (0.027λg × 0.027λg × 0.0011λg) for medical applications, operating at the 915 MHz ISM band. Since the suggested design has a slotted ground plane, it has the potential to generate a broader bandwidth and lower antenna back-radiation into human skin tissues of a 25-mm surface area.
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