Development and microwave analysis of slot antennas for localized hyperthermia treatment of hepatocellular liver tumor.

Slot antennas are often considered as a suitable choice for microwave ablation due to design simplicity, low cost to manufacture and a highly confined temperature profile. In this paper, an iterative coupled thermal/microwave numerical formulation is presented to analyze and develop miniature slot antenna geometries for localized liver cancer treatment. The thermal solver determines the specific absorption rate (SAR) as a pre-processing step to determine the temperature distribution profile within malignant tissues. The microwave solver uses this computed thermal solution together with related boundary/sub-domain settings to determine complex propagation wave number as an Eigen value. The desired microwave response in terms of insertion loss <0.1 dB, VSWR 1:1.1, and return loss less than -22 dB was achieved at 2.45 GHz. The simulated results agree well with the measured response.