Design of Chalcogenide Phase Change Metamaterial Based Microwave Absorber

Active tunable materials have emerged as a promising solution for achieving frequency and amplitude tunability in microwave absorbers. In this work, we have designed a metamaterial-based microwave absorber utilizing a phase change material (PCM) to enable dynamic control. The tunability is achieved by manipulating the phase state of the PCM, transitioning from the high-resistance amorphous state to the lowresistance crystalline state. Our design demonstrates a significant absorption amplitude contrast of approximately $93 \%$ at around $15 G H z$. The designed structure exhibits good angular stability, maintaining similar absorption contrast over a wide range of incident angles $\left(0^{\circ}\right.$ to $\left.40^{\circ}\right)$. It also remains the same for TE and TM propagation modes, making it highly useful for practical applications.