Compact Magnetically Symmetric Antenna Design for Implantable Biomedical Applications

This paper proposes a coplanar waveguide feed (CPW-fed) based patch antenna for implantable biomedical applications operating at Industrial, Scientific, and Medical (ISM) band. The antenna has a magnetically symmetric configuration with dimensions of 30 mm ×30 mm l. In free space, the proposed antenna covers a wideband ranging from 2.39 - 2.57 GHz, thereby posing a -10 dB bandwidth of 180 MHz with a peak gain of 2.23 dB. For implant case, the antenna is simulated by creating a three-layered human tissue model in CST MWS 2019. The proposed design also offers -10 dB bandwidth covering the ISM band after implanting inside muscle layer with a peak gain value of -6.46 dB. A prototype of antenna is fabricated for measurement proposes. An ex-vivo testing of proposed design was performed by placing the fabricated antenna inside a fresh pork slab. The measured and simulated results demonstrate the significance of proposed antenna for wearable and implantable biomedical applications.