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This study presents a novel 3D-printed MMA using a fused annular microfluidic meta-atom architecture for W-band absorption, where three orthogonally fused annular meta-atoms form a complex 3D microfluidic unit. High-precision micro 3D printing enables a strong solid–liquid coupling effect to achieve ultra-low reflection loss and wide effective absorption bandwidth. Impedance matching and field-distribution analyses clarify mechanisms, and demonstrations show radar echo suppression for metallic targets.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/annular-microfluidic-meta-atom-fusion-enabled-broadband-metamaterial-absorber/438847/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/annular-microfluidic-meta-atom-fusion-enabled-broadband-metamaterial-absorber/438847.png","ImageObject",300,407,{"name":92,"@type":93},"Oliver","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-01","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the core design idea of the proposed fused annular microfluidic meta-atom MMA?","Question",{"text":112,"@type":113},"The absorber uses a fused annular microfluidic meta-atom (FAMMA) architecture in which three orthogonally fused annular meta-atoms form a complex 3D microfluidic meta-atom structure.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is broadband absorption achieved in the FAMMA-based metamaterial absorber?",{"text":117,"@type":113},"Broadband absorption is enabled by the synergistic solid–liquid coupling effect of the orthogonal 3D structure, together with impedance matching and electromagnetic field distribution characteristics.",{"name":119,"@type":110,"acceptedAnswer":120},"What absorption performance and frequency ranges are reported?",{"text":121,"@type":113},"Representative devices achieve ultra-low reflection loss (RL down to −42.1 dB), ultra-broadband effective absorption bandwidth (EAB of 31.3 GHz), and dual-band absorption in 76.0–85.3 GHz and 99.1–105.6 GHz.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},438847,1790719217,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},8796095461610,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","e-ISSN 2150-5551 CN 31-2103/TB  \nARTICLE [https://doi.org/10.1007/s40820-025-02018-2](https://doi.org/10.1007/s40820-025-02018-2)  \nCite as  \nNano-Micro Lett.(2026) 18:169  \nReceived: 23 August 2025  \nAccepted: 13 November 2025  \nPublished online: 5 January 2026 © The Author(s) 2026  \nAnnular Microfluidic Meta‑Atom Fusion‑Enabled Broadband Metamaterial Absorber  \nJinpeng Peng 1, Yi Zhang 1,2 *, Zihao Chen3, Qiye Wen3, Shaomeng Wang3, Yaoyao Li 1, Aiwu Zhou 1, Zhengnan Sun 1, Xiaohui Mu 1, Xiaosheng Zhang 1 *  \nHIGHLIGHTS  \n• Unique 3D-printed electromagnetic metamaterial absorber based on a fused annular microfluidic meta-atom architecture.  \n• Synergistic solid-liquid coupling effect of the unique three-dimensional orthogonal structure to achieve strong broadband absorption.  \n• High-performance broadband absorption for millimeter wave.  \nABSTRACT Electromagnetic (EM) metamaterial absorbers (MMAs) with broadband absorption are of growing interest for applications such as stealth and EM interference mitigation. In this work, we present a novel 3D-printed MMA based on a fused annular microfluidic metaatom (FAMMA) architecture, designed for W-band absorption. The FAMMA structure features three kinds of orthogonally fused annual meta-atoms, forming a complex 3D microfluidic meta-atom with intricate architecture. Fabricated via high-precision micro 3D printing technology, the FAMMA-based MMA exploits the synergistic solid–liquid coupling effect of the unique three-dimensional orthogonal structure to achieve strong broadband absorption. Three representative FAMMAs with different geometric dimensions have achieved ultra-low reflection loss (RL of − 42.1 dB), ultra-broadband effective absorption bandwidth (EAB of 31.3 GHz), and dual-band absorption (in 76.0–85.3 and 99.1–105.6 GHz), respectively. The underlying absorption mechanisms are elucidated by impedance matching theory and electromagnetic field distribution analyses. Application demonstrations show that the FAMMA-based MMA significantly suppresses radar echo power and renders metallic targets undetectable to both radar detector and radar imaging systems, highlighting its potential in stealth technology. Overall, this work establishes a new design concept for high-performance broadband millimeter wave MMAs, opening new avenue for future applications such as high-speed communication, through-wall sensing, and drone detection.  \nKEYWORDS Metamaterial absorber; MMA; 3D printing; Additive manufacturing; Radar stealth  \nJinpeng Peng and Yi Zhang contributed equally to this work.  \n* Yi Zhang, [yi_zhang@uestc.edu.cn](yi_zhang@uestc.edu.cn); Xiaosheng Zhang, [zhangxs@uestc.edu.cn](zhangxs@uestc.edu.cn)  \n1 School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China  \n2 Tianfu Jiangxi Laboratory, Chengdu 641419, People’s Republic of China  \n3 School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China  \n1 Introduction  \nElectromagnetic (EM) metamaterial absorber (MMA) represents a transformative class of artificially engineered materials designed to manipulate EM waves in ways unparalleled by traditional absorbing materials [1–3] . Unlike traditional materials, whose absorption characteristics are governed by their intrinsic material dielectric and magnetic loss, MMAs interact with EM waves via a meta-atom lattice, achieving near-unity absorption through meticulous structural design to maximize EM wave confinement and dissipative loss [4] . Previously reported water-based MMA almost operates in the low-frequency microwave band. It is noteworthy that high-frequency millimeter wave radars have already demonstrated promising potential across a wide range of applications, including high-speed communication [5], automobile driver-assistance systems [6], through-wall sensing [7], and drone detection [8] . For exa","cbCaifsmQ6lq44e3","https://ap.wps.com/l/cbCaifsmQ6lq44e3","pdf",5030378,17,"English","# Highlights\n# Abstract\n# Keywords\n# 1 Introduction","[{\"question\":\"What is the core design idea of the proposed fused annular microfluidic meta-atom MMA?\",\"answer\":\"The absorber uses a fused annular microfluidic meta-atom (FAMMA) architecture in which three orthogonally fused annular meta-atoms form a complex 3D microfluidic meta-atom structure.\"},{\"question\":\"How is broadband absorption achieved in the FAMMA-based metamaterial absorber?\",\"answer\":\"Broadband absorption is enabled by the synergistic solid–liquid coupling effect of the orthogonal 3D structure, together with impedance matching and electromagnetic field distribution characteristics.\"},{\"question\":\"What absorption performance and frequency ranges are reported?\",\"answer\":\"Representative devices achieve ultra-low reflection loss (RL down to −42.1 dB), ultra-broadband effective absorption bandwidth (EAB of 31.3 GHz), and dual-band absorption in 76.0–85.3 GHz and 99.1–105.6 GHz.\"}]","Annular Microfluidic Meta-Atom Fusion-Enabled Broadband Metamaterial Absorber | PDF",1790686554,43]