Paper Title
Metamaterial Based Mmwave Frequency Selective Surface on Body Antenna for Tumor Detection

Abstract
This study uses a human phantom model to construct and assess a frequency-selective surface (FSS) and a microstrip patch antenna operating in the 40-48 GHz range for tumor detection. The antenna is built on a Rogers substrate that is 1 mm thick and has a clear resonance at 49.11 GHz. To provide frequency tunability, a 3x3 superstrate array of 7x7 mm² metamaterial-based FSS unit cells is placed above the patch. With a transmission coefficient of S21 = −0.19 dB at 45.54 GHz and a reflection coefficient of S11 = −27.20 dB, the FSS unit cell exhibits high frequency selectivity. After integration, the antenna's resonant frequency continuously shifts downward to 43.42 GHz, converging toward the FSS resonance, indicating effective electromagnetic coupling between the antenna and the FSS. The resonance shifts to 43.536 GHz when put over a typical human phantom, and it further shifts to 43.544 GHz when a tumor is present. These findings verify that the FSS serves as a tunable superstrate, allowing for exact control over the antenna's operating frequency and tumor detection. For millimeter-wave applications, such as sensing, imaging, and high-frequency wireless communication, the suggested architecture provides a small and adaptable solution. Keywords - Frequency Selective Surface, Patch Antenna, Metamaterials, Millimeter Wave