An Inexpensive Coaxial Balun-free Antenna for Microwave Tumor Treatment

As a minimally invasive tumor treatment method, microwave ablation (MWA) has received more and more attention in clinical applications. The challenge is to design an antenna that can generate a localized heating area, to kill all cancer cells while affecting normal cells as little as possible. An inexpensive balun-free antenna based on a coaxial line is designed in this paper. By adding a short-circuited sleeve at the end of coaxial line, the current on the outer conductor of the coaxial line is suppressed and, finally, the area of the ablation is located. The ablation experiment based on the dummy-tissue gel confirms the effectiveness of the designed antenna. Under the input power of 16 W at 2.45 GHz, the temperature of the tissue rises from 26℃ to 47℃, and a highly localized ablation zone is achieved.