Development of Flexible S-band Electromagnetic Metamaterials and Their Application in Microwave Ablation

RUAN Hailing; WANG Tao; HONG Rutao

doi:10.19554/j.cnki.1001-3563.2025.17.008

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (17) : 69-79. DOI: 10.19554/j.cnki.1001-3563.2025.17.008

Special Topic on Lightweight Broadband Electromagnetic Composite Materials

Development of Flexible S-band Electromagnetic Metamaterials and Their Application in Microwave Ablation

RUAN Hailing^1,2,3, WANG Tao⁴, HONG Rutao^1,*

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Abstract

To meet the needs of 2.45 GHz microwave ablation and S-band electromagnetic stealth applications, the work aims to develop a flexible S-band metamaterial absorber and measure its effect on phantom heating during microwave ablation. By using the design method that combined microwave equivalent circuit analysis with three-dimensional electromagnetic field analysis, the pattern layer was printed by organic conductive materials on an organic dielectric substrate to manufacture a metamaterial prototype. This metamaterial was then positioned around a phantom with a plane or curved configuration, and temperature changes at equidistant points inside the phantom during microwave ablation were measured. With a total thickness of only 8 mm, the absorber was measured in both plane and curved configurations, and its absorption rate in the S-band exceeded 80% and its energy absorption rate at 2.45 GHz was greater than 95%. Additionally, when the relative position between the metamaterial and the phantom changed, there was a significant difference in temperature changes in the phantom during microwave ablation, and the maximum temperature differences exceeded 10 °C at equidistant points. As a result, the metamaterial absorber significantly affects temperature changes at equidistant points in the phantom during microwave ablation, which is helpful for preventing carbonization and overtreatment. This advancement positively impacts the future of intelligent and conformal microwave ablation.

Key words

electromagnetic metamaterials / flexible absorber / S-band / microwave ablation / temperature change

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RUAN Hailing, WANG Tao, HONG Rutao. Development of Flexible S-band Electromagnetic Metamaterials and Their Application in Microwave Ablation[J]. Packaging Engineering. 2025, 46(17): 69-79 https://doi.org/10.19554/j.cnki.1001-3563.2025.17.008

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