Ultrabroadband Imaging Meta‐Illusion via Composite Dispersion Tailoring

Microwave imaging, a non‐invasive technique that reconstructs object features by analyzing the reflected electromagnetic signals, has become a cornerstone in critical domains, such as target recognition, remote localization, and medical diagnostics. As a countermeasure, imaging illusion aims to generate fake electromagnetic signatures to deceive radar detection systems. However, a key challenge persists in preserving the spatiotemporal consistency of these illusive signatures with high‐resolution range detection. Here, we propose tailoring composite dispersion over a broad bandwidth using multi‐mode resonant meta‐structures, enabling imaging illusion at the theoretical resolution limit corresponding to the working bandwidth. We design and fabricate an imaging meta‐illusion to replicate a car model's electromagnetic signature; experiments confirm near‐identical characteristics, with a structural similarity index exceeding 0.86 and strong correlation across the entire X‐band in both far and near fields. This work offers insights for real‐world electromagnetic illusion, paving the way for next‐generation broadband meta‐devices and advanced imaging cloaking technologies.