由杂散微波能量驱动的智能超构器件：一种屏蔽外部干扰与探测的绿色方法

Abstract Protecting sensitive electronic devices from external stray microwaves is essential for a range of practical applications. Current shielding devices such as filters and frequency-selective surfaces are vulnerable to harmful signals at in-band frequencies due to their mechanisms relying on filtering out-of-band signals through frequency-selective responses. This study presents a smart meta-device powered by stray microwave energies, designed to autonomously shield against external interference and detection without the need for an external power supply or human intervention. Such meta-devices integrate reconfigurable meta-atom arrays and sensing-powering modules to form a sensing-powering-feedback closed-loop system. This enables real-time sensing of high-power microwaves and the automatic transition from high transmission to shielding or absorbing external harmful microwave energy. A prototype was fabricated, characterized, and demonstrated as a smart high-power microwave shielding device and adaptive stealth radome , operating between 6.0 GHz to 6.7 GHz. Unlike other smart/intelligent meta-devices, the proposed meta-device operates autonomously without external power supplies or complex microwave networks. This signifies a paradigm shift in electromagnetic shielding technology and represents a breakthrough in the development of autonomous, sustainable, and maintenance-free microwave devices.