Characteristics of coaxial cable antenna with a ring slot for RTA

Radiofrequency thermal ablation (RTA) is becoming one of the treatment for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using electromagnetic simulation tools Maxwell program and analyzed the return loss and the electric field E/sub tot/ at the near-field region between the simulation results and the experiment results. As a result, we could obtain the return loss of 29.786 dB at 2450 MHz only when the antenna is placed between two liver blocks of a pig, and the measurement results agreed with the simulation results well. Therefore, this coaxial cable antenna with a ring slot can be used very usefully as the applicator for RTA.