Design of A Dual-Frequency Planar Microwave Ablation Antenna

In this paper, a planar microwave ablation antenna based on printed-circuit-board (PCB) structure is proposed and designed. The structure has three layers of metal and two layers of medium plate, as traditional strip-lines. The energy radiates efficiently at the gap for microwave ablation, based on the combination of metal cladding and slit. Proposed design is simulated by using full wave simulation software CST Microwave Studio, with temperature distribution available for verification. Simulated results show that the proposed ablation antenna resonates at 915 MHz and 2450 MHz, respectively, the dual-band applicator reflection coefficient is below -20 dB, and the roundness of the ablation region is greater than 0.7. This design could be a good candidate for ablating malignant tumors efficiently.