In-Vitro Test of Miniaturized CPW-Fed Implantable Conformal Patch Antenna at ISM Band for Biomedical Applications

Abstract

In this paper, the design and the analysis of miniaturized implantable conformal patch antennas are proposed for biomedical applications. A polyimide substrate material is considered to achieve conformability. The radiating element is a monopole rectangular patch antenna with three split ring resonators (SRR), and a rectangular slot with CPW (coplanar waveguide) feeding is presented. The proposed implantable conformal CPW-fed patch (ICCP) antenna resonates at free space at 2.41 GHz (2.01-2.82 GHz) frequency with an impedance bandwidth of 810 MHz and the gain of 2.62 dB are observed. The in vitro test is considered in muscle mimicking phantom gel with proposed ICCP antenna, and it resonates at 2.60 GHz (2.41-2.81 GHz) with an impedance bandwidth of 400 MHz and the gain of -19.6 dB are observed. The ICCP antenna is also considered in different layers of the human tissue simulation model, and the antenna works at ISM band. The specific absorption rate (SAR) is obtained for all proposed cases, and these are all within the limits of the federal communication commission (FCC). The ICCP antenna is manufactured and tested for free space and a muscle mimicking phantom gels. Good agreement results have observed between simulated and measured values.

Keywords

• Conformal antenna
• SRR
• CPW-fed
• implanted devices
• in-vitro
• polyimide