Design and analysis of a miniaturized rhombus-rectangular antenna for WMTS and ISM bands

Abstract This paper presents the design and performance evaluation of a novel implantable antenna for biomedical applications. Implantable antennas are used in biomedical devices for wireless communication, enabling applications like health monitoring, drug delivery, and bio-sensing within the human body. The proposed antenna structure features a compact configuration consisting of three rhombus-shaped resonators of varying sizes attached to a rectangular resonator. The antenna is ideal for implantation because of its small size (5 × 5 × 1.27 mm 3 ), which adds up to a total volume of 31.75 mm 3 . Compatibility with essential wireless communication standards for medical applications is ensured by the antenna’s dual-band resonance at 2.42 GHz in the Industrial, Scientific, and Medical (ISM) band and 1.4 GHz in the Wireless Medical Telemetry Service (WMTS) band. A notable feature of the design is its high fractional bandwidth of 18.29%, which is superior compared to similar implantable antennas. Additionally, the Specific Absorption Rate (SAR) is substantially within the IEEE safety standards’ permissible bounds, guaranteeing safe operation close to human flesh. A promising option for next-generation biomedical devices, this small, dual-frequency, wideband antenna allows for dependable and effective wireless communication for implanted applications.