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Metasurface apertures are attractive for producing such masks; however, many implementations rely on active tuning, cavity\u2010backed apertures, folded propagation paths, mechanical reconfiguration, or multiple feeds. This work presents a passive single\u2010layer randomized leaky\u2010wave metasurface aperture for broadband near\u2010field computational microwave imaging. The aperture uses a single feeding port and an integrated 16\u2010way microstrip power divider to launch guided waves along nonperiodic rows composed of six dispersive H\u2010shaped unit\u2010cell types. Eigenmode\u2010based analysis guides the selection of these unit\u2010cell types and clarifies how their nonperiodic loading produces frequency\u2010dependent near\u2010field masks through leaky\u2010wave radiation. The fabricated prototype integrates the aperture and feed network on a  PCB, demonstrating broadband operation over 18\u201328\u00a0GHz, corresponding to 43.5% fractional bandwidth. Measured near\u2010field masks confirm broadband low\u2010redundancy spatial encoding. Imaging experiments demonstrate recovery of test targets and 5\u00a0mm two\u2010target separability in both transverse directions. These results show that static nonperiodic unit\u2010cell loading and broadband dispersion provide a compact, hardware\u2010efficient passive route to near\u2010field computational microwave\u00a0imaging.<\/jats:p>","DOI":"10.1002\/aelm.70606","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T04:49:57Z","timestamp":1791521397000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Broadband Near\u2010Field Computational Microwave Imaging Enabled by Nonperiodic Dispersive Unit\u2010Cell Loading in a Passive Metasurface"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-3486-6496","authenticated-orcid":false,"given":"Mohammed H.","family":"Arif","sequence":"first","affiliation":[{"name":"Chair of High Frequency Electronics RWTH Aachen University Aachen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8250-9297","authenticated-orcid":false,"given":"Firas Slewa","family":"Dawod","sequence":"additional","affiliation":[{"name":"School of Science and Engineering University of Missouri\u2010Kansas City Kansas City Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henrik","family":"Jansen","sequence":"additional","affiliation":[{"name":"Institute of High Frequency Technology RWTH Aachen University Aachen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caner","family":"Kad\u0131o\u011flu","sequence":"additional","affiliation":[{"name":"Chair of High Frequency Electronics RWTH Aachen University Aachen Germany"},{"name":"Microchip Frequency Technology GmbH Teltow Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1428-8071","authenticated-orcid":false,"given":"Sayan","family":"Roy","sequence":"additional","affiliation":[{"name":"School of Science and Engineering University of Missouri\u2010Kansas City Kansas City Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2438-9607","authenticated-orcid":false,"given":"Dirk","family":"Heberling","sequence":"additional","affiliation":[{"name":"Institute of High Frequency Technology RWTH Aachen University Aachen Germany"},{"name":"Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR Wachtberg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renato","family":"Negra","sequence":"additional","affiliation":[{"name":"Chair of High Frequency Electronics RWTH Aachen University Aachen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,8]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/TAP.2020.2968795"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1230054"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1364\/JOSAA.31.002109"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/MAP.2022.3169395"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/aelm.202500818"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSTEAP.2025.3602060"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmats.2021.766889"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2016.2604823"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/srep42650"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1109\/MSP.2024.3486470"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1049\/iet\u2010map.2017.0104"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1109\/TGRS.2024.3383569"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1109\/TAP.2011.2165496"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmats.2022.1112339"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1364\/OE.542764"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1109\/TAP.2024.3376020"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMTT.2025.3552130"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1109\/TAP.2025.3639927"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1364\/OE.24.008907"},{"key":"e_1_2_8_21_1","doi-asserted-by":"crossref","unstructured":"O.Yurduseven T.Fromenteze J. 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