{"title":"Wideband Near-Field Microwave Imaging With Optimal Standoff Using a Metasurface-Enhanced Printed Dipole Antenna","authors":"Soumya Chakravarty;Anwesha Khasnobish;M. Jaleel Akhtar","doi":"10.1109/LSENS.2025.3596310","DOIUrl":null,"url":null,"abstract":"Near-field microwave imaging is vital for biomedical applications requiring noninvasive subsurface anomaly detection. This study introduces a novel 3 GHz printed dipole antenna integrated with a phase gradient metasurface reflectarray and a multilayer metasurface lens, enhancing the overall directivity of the proposed antenna structure for microwave imaging. A key innovation in the imaging methodology here involves the systematic identification of an optimal spacing of the antenna structure from the target region in the near field, which substantially improves the anomaly localization in the imaging domain. Experimental results using clay phantoms demonstrate successful detection of both low-reflectivity (air pocket) and high-reflectivity (water) anomalies. The proposed scheme combines background subtraction and ±1-σ one-sided percentile-based thresholding for accurate imaging and validates the metasurface-enhanced antenna system's robustness and adaptability for biomedical near-field imaging.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 9","pages":"1-4"},"PeriodicalIF":2.2000,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Sensors Letters","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/11119004/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Near-field microwave imaging is vital for biomedical applications requiring noninvasive subsurface anomaly detection. This study introduces a novel 3 GHz printed dipole antenna integrated with a phase gradient metasurface reflectarray and a multilayer metasurface lens, enhancing the overall directivity of the proposed antenna structure for microwave imaging. A key innovation in the imaging methodology here involves the systematic identification of an optimal spacing of the antenna structure from the target region in the near field, which substantially improves the anomaly localization in the imaging domain. Experimental results using clay phantoms demonstrate successful detection of both low-reflectivity (air pocket) and high-reflectivity (water) anomalies. The proposed scheme combines background subtraction and ±1-σ one-sided percentile-based thresholding for accurate imaging and validates the metasurface-enhanced antenna system's robustness and adaptability for biomedical near-field imaging.