Miniaturized slot loaded on-chip loop antenna with multi-fingered inner loop for implantable devices

Abstract

Design of implantable devices at 2.4 GHz ISM band for medical examination has been extensively researched ever since IoT has gained importance. Implantable devices need to be small and less power hungry. In this paper, a small size and highly efficient 2.4 GHz miniaturized on-chip loop antenna has been proposed and is suitable for biotelemetry applications. The substrate stack up of on chip antenna consists of 6 metal layers. Antenna is designed on the top most metal layer (M6). Miniaturization is achieved by using the principle of slot loading and multi-fingered loop loading. The proposed antenna utilizes the surface area within loop antenna to increase the efficiency of proposed antenna.The proposed antenna is simulated using Advanced Design System (ADS) tool. The gain of the simulated on chip antenna is -13.93 and efficiency is 1.91%, which is the highest gain reported at 2.4 GHz. The dimensions of the antenna is 1.5mm x 1.0 mm.