Frontiers in medical technology · 2026
A stacked cavity-backed metamaterial antenna for confined hyperthermia of subcutaneous fat in ISM band.
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Lee Dong-Min, Jung Yun-Jae, Kim Ikhwan, Cho Kyujin, Wang Qingzhou, Oh Seongwoog, Kim Eun-Seong, Kim Nam-Young
Аннотация
INTRODUCTION: Hyperthermia has emerged as a versatile modality in oncology, rehabilitation, and aesthetic medicine, yet conventional RF devices often suffer from insufficient penetration and collateral epidermal heating. This study proposes a miniaturized stacked cavity-backed antenna operating in the 2.4-2.5 GHz ISM band for depth-confined heating of facial subcutaneous fat.
METHODS: By leveraging the strong dielectric contrast at the skin-fat boundary, the design enhances the normal electric-field component in adipose tissue to promote preferential power deposition without active epidermal cooling. Electromagnetic simulations quantify field and SAR confinement, and multiphysics thermal simulations evaluate short-pulse therapeutic operation. The methodology is validated through ex vivo porcine experiments and a preliminary in vivo human feasibility test (10 W, surface thermography).
RESULTS: The results confirm reproducible superficial warming at the target depth without adverse skin reactions. The study successfully demonstrates single-element hardware feasibility and effective depth-selective energy confinement within the subcutaneous fat layer.
CONCLUSION: This research establishes the fundamental hardware capability for targeted facial hyperthermia. However, macroscopic treatment-uniformity protocols and long-term clinical efficacy remain topics for future clinical studies.
METHODS: By leveraging the strong dielectric contrast at the skin-fat boundary, the design enhances the normal electric-field component in adipose tissue to promote preferential power deposition without active epidermal cooling. Electromagnetic simulations quantify field and SAR confinement, and multiphysics thermal simulations evaluate short-pulse therapeutic operation. The methodology is validated through ex vivo porcine experiments and a preliminary in vivo human feasibility test (10 W, surface thermography).
RESULTS: The results confirm reproducible superficial warming at the target depth without adverse skin reactions. The study successfully demonstrates single-element hardware feasibility and effective depth-selective energy confinement within the subcutaneous fat layer.
CONCLUSION: This research establishes the fundamental hardware capability for targeted facial hyperthermia. However, macroscopic treatment-uniformity protocols and long-term clinical efficacy remain topics for future clinical studies.