Design of Wideband Dielectric Near-Field Lens for Medical Applications in Tumor Treatment

Abstract

This paper presents a dielectric near-field lens for hyperthermia applications in tumor cell destruction, unlike the previous methods that used microstrip near-field lenses. Dielectric lenses benefit from operating in a wideband frequency range, low profile, and no surface current generated on them. The proposed dielectric lens is divided into 13 symmetric regions and each region comprises exclusive dielectric constants that contribute to microwave energy aggregation in the tumor area. The microwave energy accumulation leads to tumor cell destruction after therapeutic purpose temperature elevation during a defined time. The proposed near-field lens is designed for both superficial and deep-seated tumors. Specific Absorption Rate (SAR) and Effective Treatment Area (ETA) principles are used to analyze the lens effect on electromagnetic wave distribution on the phantom simulated human body. Based on the achieved SAR and ETA distribution on the biological phantom at 2.4 GHz, the proposed lens for superficial tumors demonstrated effective performance in focusing electromagnetic waves on the desired focal point.