Microstrip Antenna for Tumor Detection: SAR Analysis

Abstract

In this paper, antenna microstrips for the detection of tumors in the breast and brain have been designed. 4x4 array antenna using Kapton Polyimide flexible substrate ($\varepsilon\mathrm{r}$= 3.5) is used for breast tumor detection which works at a frequency of 4.9 GHz - 6.4 GHz. The use of this flexible material is so that later the antenna can be bent and adjust to the shape of the breast. Meanwhile, the microstrip antenna with a pentagonal patch used to detect brain tumors can work at a frequency of 2.4 GHz - 2.4835 GHz using the FR-4 substrate ($\varepsilon r$=4.3). This flexible antenna measures 20x25 mm2 with a thickness of 0.05 mm, while the antenna on the FR-4 has a thickness of 1.6mm with dimensions of 46x40x1.65 mm3. The flexible antenna simulation results show that the reflection point (S11) parameter is -37.50 dB with a SAR of 1.5565 W/kg. While the S11 of -14.50 dB at 2.44 GHz with a SAR of 0.03866 W/kg is obtained on the FR4 antenna. The two SAR values obtained in this simulation do not exceed the maximum set standards.