Analysis of Copper Tube Sleeve Coaxial Spiral Antenna for Interstitial Hepatic Microwave Ablation

Abstract

Microwave ablation (MWA) is most promising treatment of hepatocellular carcinoma with low complications. Microwave antennas are critical as well as integral element of MWA. In the present paper 3-D commercial CST Microwave Studio has been used to simulate the new antenna named as Copper Tube Sleeve Coaxial Spiral Antenna. The copper tube not only chokes the current on outers conductor surface which leads to good impedance matching and better specific absorption rate but also gives strength to the antenna so that it can be easily introduced into the tissues through biopsy needles. The antenna results has been designed and optimized with lower reflection coefficient. The simulation results shown optimal S11 of −37.19 dB at 2.45 GHz, with 99.9% power absorption by the liver tissue with average cell mass of 0.000849734 gram with averaging mass of liver tissue 10 gram and larger ablation zone.