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To solve this problem, this study proposes a flexible antenna strain sensor based on a ductile graphene film, which features a 6.7% elongation at break and flexibility due to the microscopic wrinkle structure and layered stacking structure of the graphene film. Because of the use of eccentric embedding in the feeding form, the sensor can be miniaturized and can simultaneously monitor strain in two directions. The sensing mechanism of the antenna is analyzed using a void model, and an antenna is designed based on operating frequencies of 3 GHz and 3.5 GHz. The embedding size is optimized using a Smith chart and impedance matching principle. Both the simulation and experimental results verify that the resonant frequency and strain magnitude are linearly inversely proportional. The experimental results show that the strain sensitivity is 1.752 kHz\/\u03bc\u03b5 along the geometric length and 1.780 kHz\/\u03bc\u03b5 along the width, with correlation coefficients of 0.99173 and 0.99295, respectively.<\/jats:p>","DOI":"10.3390\/s24134388","type":"journal-article","created":{"date-parts":[[2024,7,8]],"date-time":"2024-07-08T09:01:19Z","timestamp":1720429279000},"page":"4388","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Flexible Graphene Film-Based Antenna Sensor for Large Strain Monitoring of Steel Structures"],"prefix":"10.3390","volume":"24","author":[{"given":"Shun","family":"Weng","sequence":"first","affiliation":[{"name":"School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"},{"name":"Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingqi","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3327-0117","authenticated-orcid":false,"given":"Ke","family":"Gao","sequence":"additional","affiliation":[{"name":"School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"},{"name":"Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongping","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"},{"name":"Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tingjun","family":"Peng","sequence":"additional","affiliation":[{"name":"School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Baek, H., Yu, S., Son, S., Seo, J., and Chung, Y. 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