TY - JOUR
T1 - Dual-Frequency Microwave Ablation Antenna With Tunable Directional Ratio for Tumor Treatment
AU - Fang, Ziyi
AU - Wang, Li
AU - Bao, Xiue
AU - Cheng, Qingsha S.
AU - Ye, Xihong
AU - He, Mang
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2025
Y1 - 2025
N2 - This article presents a dual-frequency microwave ablation antenna (DMWAA) with tunable directional-ratio heating for precise tumor ablation near sensitive organs. The dual-frequency antenna (2.45/5.8 GHz) comprises a notched-edge monopole and a reflector based on the substrate-integrated coaxial line (SICL), eliminating the need for a balun structure. Two pairs of symmetrical rectangles are etched at the monopole edge for dual-frequency operation, and the bottom conductor of the SICL is extended as a reflector for directional ablation. Full-wave electromagnetic (EM) and transient thermal simulations are used to analyze the antenna’s performance. The antenna prototype is fabricated and utilized in ex vivo porcine liver ablation experiments across different frequencies. The results demonstrate distinct advantages at both operating frequencies: at 2.45 GHz, it achieves uniform ablation with a time-stable directional ratio (DR) between 1.3 and 1.4 with input power levels of 20 W. At 5.8 GHz, the antenna offers a tunable DR ranging from 1.1 to 2.5, enabling customized ablation patterns through adjustments of operating duration (5 or 10 min) and input power (15 or 20 W), with higher values (e.g., 2.8) associated with early-stage thermal damage under a 2-min operation time. At a reduced input power of 15 W, the ablation area decreases with improved uniformity, while the directionality exhibits 1.4 times compared to that at 20 W. These findings validate that the proposed DMWAA achieves precise, adaptable ablation for complex clinical needs.
AB - This article presents a dual-frequency microwave ablation antenna (DMWAA) with tunable directional-ratio heating for precise tumor ablation near sensitive organs. The dual-frequency antenna (2.45/5.8 GHz) comprises a notched-edge monopole and a reflector based on the substrate-integrated coaxial line (SICL), eliminating the need for a balun structure. Two pairs of symmetrical rectangles are etched at the monopole edge for dual-frequency operation, and the bottom conductor of the SICL is extended as a reflector for directional ablation. Full-wave electromagnetic (EM) and transient thermal simulations are used to analyze the antenna’s performance. The antenna prototype is fabricated and utilized in ex vivo porcine liver ablation experiments across different frequencies. The results demonstrate distinct advantages at both operating frequencies: at 2.45 GHz, it achieves uniform ablation with a time-stable directional ratio (DR) between 1.3 and 1.4 with input power levels of 20 W. At 5.8 GHz, the antenna offers a tunable DR ranging from 1.1 to 2.5, enabling customized ablation patterns through adjustments of operating duration (5 or 10 min) and input power (15 or 20 W), with higher values (e.g., 2.8) associated with early-stage thermal damage under a 2-min operation time. At a reduced input power of 15 W, the ablation area decreases with improved uniformity, while the directionality exhibits 1.4 times compared to that at 20 W. These findings validate that the proposed DMWAA achieves precise, adaptable ablation for complex clinical needs.
KW - Dual frequency
KW - microwave ablation (MWA) antenna
KW - tumor treatment
KW - tunable directional ratio
UR - https://www.scopus.com/pages/publications/105006580324
U2 - 10.1109/TAP.2025.3570506
DO - 10.1109/TAP.2025.3570506
M3 - Article
AN - SCOPUS:105006580324
SN - 0018-926X
VL - 73
SP - 6357
EP - 6366
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 9
ER -