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Conventional approaches generally address stealth in only one or two spectral bands\u2014such as radar, visible light, or infrared (IR)\u2014thereby limiting their effectiveness against advanced detection systems. In this study, we present, for the first time, an integrated and dynamically adaptive electrochromic system capable of achieving simultaneous stealth across the radar, near\u2010infrared (NIR), and visible spectra. This single\u2010device platform surpasses traditional independent or discrete methods in complexity, efficiency, and real\u2010time tunability. Our multispectral stealth device employs a vertically integrated electrochromic device (ECD) that unifies stealth functionality across all three spectral domains. Visible and NIR camouflage are realized through voltage\u2010controlled, real\u2010time modulation of reflectance, enabled by the electrochromic properties of the ECD and its embedded indium tin oxide (ITO) layers. Radar camouflage is achieved through precisely patterned ITO structures incorporated within the device, effectively suppressing electromagnetic wave reflections. To validate this approach, we performed numerical simulations and experimental characterizations using an X\u2010band waveguide, confirming consistent and robust multispectral stealth performance. This work represents a significant advancement in multispectral stealth technology by integrating radar, NIR, and visible light camouflage into a single, tunable platform.<\/jats:p>","DOI":"10.1002\/nap2.70102","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T13:30:46Z","timestamp":1776864646000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["All\u2010in\u2010One Multispectral Stealth Device for X\u2010Band Radar, Visible, and Near\u2010Infrared Spectra"],"prefix":"10.1002","volume":"15","author":[{"given":"Jinwoo","family":"Ho","sequence":"first","affiliation":[{"name":"Department of Intelligent Semiconductor Engineering Chung\u2010Ang University  Seoul Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juhyun","family":"Park","sequence":"additional","affiliation":[{"name":"Display and Nano System Laboratory, School of Electrical Engineering Korea University  Seoul Republic of Korea"},{"name":"Reality Devices Research Division Electronics and Telecommunications Research Institute  Daejeon Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5000-5729","authenticated-orcid":false,"given":"Jiyoung","family":"Oh","sequence":"additional","affiliation":[{"name":"Reality Devices Research Division Electronics and Telecommunications Research Institute  Daejeon Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chil Seong","family":"Ah","sequence":"additional","affiliation":[{"name":"Reality Devices Research Division Electronics and Telecommunications Research Institute  Daejeon Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jae Woo","family":"Seo","sequence":"additional","affiliation":[{"name":"Reality Devices Research Division Electronics and Telecommunications Research Institute  Daejeon Republic of 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