A Miniaturized Unidirectional On-Body Antenna for Ultra-Wideband Electromagnetic Medical Applications

A miniaturized, unidirectional on-body antenna designed for ultra-wideband (UWB) electromagnetic (EM) medical applications is proposed. The antenna is optimized for high-permittivity human tissues, the design delivers a wide impedance bandwidth of 170 % (0.5 - 7 GHz) and unidirectional near-field radiation, making it suitable for both deep-tissue and surface-level medical applications. The proposed antenna achieves a compact size (502 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup>) by employing multiple radiating modes excited through the shorted ring and shorted parasitic patch. Comprehensive simulations and measurements, including testing on homogeneous and multi-tissue realistic human body models were performed demonstrating effective power penetration and good matching across a broad frequency range 0.5 - 7 GHz. The proposed miniaturized on-body antenna with unidirectional pattern, and UWB bandwidth underline its potential for applications such as EM biomedical diagnosis and wireless body area networks.