Analyzing the Impact of thermal variations on agricultural waste-based Microwave absorbers

Analyzing the Impact of thermal variations on agricultural waste-based Microwave absorbers | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Analyzing the Impact of thermal variations on agricultural waste-based Microwave absorbers ANJU TRIPATHI, Karmjit Singh Sandha This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7703148/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 5 You are reading this latest preprint version Abstract This paper investigates the microwave absorption characteristics of dried banana leaves (DB) and their composite with multi-walled carbon nanotubes (DB-CNTs) in the C-band frequency range (3.7–7.4 GHz ) across a temperature range of 20°C to 120°C. Using a one-port vector network analyzer (VNA) and WG13 waveguide. The reflection loss (S 11 parameter) was measured to evaluate absorption efficiency. The results indicate that DB alone exhibits good microwave absorption at room temperature, achieving a minimum reflection loss (RL) of -26.44 dB at 5.02 GHz . However, as the temperature increases, its absorption capability weakens, reaching − 16.96 dB at 120°C, primarily due to moisture loss, reduced dipolar polarization, and structural degradation. But the incorporation of CNTs significantly enhances absorption performance with DB-CNT achieving a minimum RL of -40.43 dB at 20°C and maintaining − 24.18 dB at 120°C, demonstrating superior thermal stability. The improved absorption is attributed to enhanced conduction loss, multiple scattering effects, and better impedance matching, which remain effective even at elevated temperatures. The findings suggest that DB-CNT composites are promising candidates for thermally stable microwave absorber applications, outperforming DB alone in high-temperature environments. This research paper highlights the potential of biowaste-derived materials for sustainable electromagnetic interference (EMI) shielding and radar absorption applications. The DB-CNTs composite presents an eco-friendly alternative to conventional microwave absorbers with strong absorption efficiency and stability across varying temperatures, making it suitable for aerospace, defense, and industrial applications. Bio-composite Carbon nanotubes Temperature Reflection loss Absorption power Microwave absorber Full Text Cite Share Download PDF Status: Under Review Version 1 posted Reviewers agreed at journal 27 Oct, 2025 Reviewers invited by journal 25 Oct, 2025 Editor invited by journal 12 Oct, 2025 Editor assigned by journal 25 Sep, 2025 First submitted to journal 24 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7703148","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":534716042,"identity":"9c9e0c1e-a49f-4656-b128-2e9822957c5e","order_by":0,"name":"ANJU 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absorbers","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"waste-and-biomass-valorization","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"wave","sideBox":"Learn more about [Waste and Biomass Valorization](http://link.springer.com/journal/12649)","snPcode":"12649","submissionUrl":"https://submission.nature.com/new-submission/12649/3","title":"Waste and Biomass Valorization","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Bio-composite, Carbon nanotubes, Temperature, Reflection loss, Absorption power, Microwave absorber","lastPublishedDoi":"10.21203/rs.3.rs-7703148/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7703148/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThis paper investigates the microwave absorption characteristics of dried banana leaves (DB) and their composite with multi-walled carbon nanotubes (DB-CNTs) in the C-band frequency range (3.7\u0026ndash;7.4 \u003cem\u003eGHz\u003c/em\u003e) across a temperature range of 20\u0026deg;C to 120\u0026deg;C. Using a one-port vector network analyzer (VNA) and WG13 waveguide. The reflection loss (S\u003csub\u003e11\u003c/sub\u003e parameter) was measured to evaluate absorption efficiency. The results indicate that DB alone exhibits good microwave absorption at room temperature, achieving a minimum reflection loss (RL) of -26.44 \u003cem\u003edB\u003c/em\u003e at 5.02 \u003cem\u003eGHz\u003c/em\u003e. However, as the temperature increases, its absorption capability weakens, reaching \u0026minus;\u0026thinsp;16.96 \u003cem\u003edB\u003c/em\u003e at 120\u0026deg;C, primarily due to moisture loss, reduced dipolar polarization, and structural degradation. But the incorporation of CNTs significantly enhances absorption performance with DB-CNT achieving a minimum RL of -40.43 \u003cem\u003edB\u003c/em\u003e at 20\u0026deg;C and maintaining \u0026minus;\u0026thinsp;24.18 \u003cem\u003edB\u003c/em\u003e at 120\u0026deg;C, demonstrating superior thermal stability. The improved absorption is attributed to enhanced conduction loss, multiple scattering effects, and better impedance matching, which remain effective even at elevated temperatures. The findings suggest that DB-CNT composites are promising candidates for thermally stable microwave absorber applications, outperforming DB alone in high-temperature environments. This research paper highlights the potential of biowaste-derived materials for sustainable electromagnetic interference (EMI) shielding and radar absorption applications. The DB-CNTs composite presents an eco-friendly alternative to conventional microwave absorbers with strong absorption efficiency and stability across varying temperatures, making it suitable for aerospace, defense, and industrial applications.\u003c/p\u003e","manuscriptTitle":"Analyzing the Impact of thermal variations on agricultural waste-based Microwave absorbers","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-11-05 03:17:37","doi":"10.21203/rs.3.rs-7703148/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"reviewerAgreed","content":"","date":"2025-10-27T06:45:52+00:00","index":0,"fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-10-25T04:24:24+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"Waste and Biomass Valorization","date":"2025-10-12T14:47:25+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2025-09-25T17:40:31+00:00","index":"","fulltext":""},{"type":"submitted","content":"Waste and Biomass Valorization","date":"2025-09-24T07:29:59+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"waste-and-biomass-valorization","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"wave","sideBox":"Learn more about [Waste and Biomass Valorization](http://link.springer.com/journal/12649)","snPcode":"12649","submissionUrl":"https://submission.nature.com/new-submission/12649/3","title":"Waste and Biomass Valorization","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"54575012-5a18-4af0-a31c-5fc406773e42","owner":[],"postedDate":"November 5th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2025-11-05T03:17:37+00:00","versionOfRecord":[],"versionCreatedAt":"2025-11-05 03:17:37","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7703148","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7703148","identity":"rs-7703148","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}