Dual-Band Absorptive Bandpass Filters with All- Frequency Reflectionless Performance and Enhanced Upper-Band Suppression

Dual-Band Absorptive Bandpass Filters with All- Frequency Reflectionless Performance and Enhanced Upper-Band Suppression | 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 Article Dual-Band Absorptive Bandpass Filters with All- Frequency Reflectionless Performance and Enhanced Upper-Band Suppression Gangxiong Wu, Yang Jin, Wei Zhang, Ruirui Jiang, Jin Shi This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5976354/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 02 Jul, 2025 Read the published version in Scientific Reports → Version 1 posted 13 You are reading this latest preprint version Abstract This paper presents a novel dual-band bandpass filter (BPF) with two-port all-frequency reflectionless characteristics and enhanced upper-band suppression. The design integrates a square ring resonator (SRR) and advanced coupled lines (CLs), incorporating complementary absorptive branches to achieve broadband reflectionless performance. To mitigate upper-band harmonics, radial-stub-loaded resonators (RSLSs) with high-impedance transmission lines (HITLs) are introduced, extending suppression up to 10f0 without significantly increasing the circuit footprint. A comprehensive theoretical analysis, including parametric studies and transmission zero (TZ) derivation, is conducted to optimize performance. Two prototypes are designed, fabricated, and tested: Prototype I achieves dual-band operation with all-frequency absorption, while Prototype II further enhances harmonic suppression. Experimental results closely align with simulations, with Prototype I exhibiting 3-dB fractional bandwidths (FBWs) of 19.5% and 9.7% at 1.38 GHz and 2.63 GHz, respectively, with insertion losses (ILs) of 0.95 dB and 1.47 dB. Prototype II achieves superior harmonic suppression, with attenuation levels of 22.8 dB over 2.9-20 GHz and 28.5 dB within 3.0–12 GHz. These designs offer high selectivity, inter-band isolation exceeding 45 dB, and full-spectrum absorption, providing an efficient solution for modern RF and wireless communication systems. Physical sciences/Engineering/Electrical and electronic engineering Physical sciences/Mathematics and computing/Computational science Physical sciences/Engineering Physical sciences/Physics Dual-band absorptive bandpass filter (ABPF) upper-band suppressions reflectionless. Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 02 Jul, 2025 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 17 Mar, 2025 Reviews received at journal 15 Mar, 2025 Reviews received at journal 23 Feb, 2025 Reviews received at journal 12 Feb, 2025 Reviewers agreed at journal 10 Feb, 2025 Reviewers agreed at journal 10 Feb, 2025 Reviewers agreed at journal 10 Feb, 2025 Reviewers agreed at journal 10 Feb, 2025 Reviewers invited by journal 10 Feb, 2025 Editor assigned by journal 10 Feb, 2025 Editor invited by journal 10 Feb, 2025 Submission checks completed at journal 07 Feb, 2025 First submitted to journal 06 Feb, 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. 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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-5976354","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":412526978,"identity":"f12189f3-fe1c-43f7-af2f-b661d692b235","order_by":0,"name":"Gangxiong Wu","email":"","orcid":"","institution":"Nantong University","correspondingAuthor":false,"prefix":"","firstName":"Gangxiong","middleName":"","lastName":"Wu","suffix":""},{"id":412526979,"identity":"d5fa8eab-5dd2-48a9-9a64-ca19c243e0db","order_by":1,"name":"Yang Jin","email":"","orcid":"","institution":"Nantong University","correspondingAuthor":false,"prefix":"","firstName":"Yang","middleName":"","lastName":"Jin","suffix":""},{"id":412526980,"identity":"42b6a8c0-0f57-4587-b491-89417897e37e","order_by":2,"name":"Wei Zhang","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA3ElEQVRIie3PoQoCMRjA8U8GswytnyjcK0wOjPoqJwemqVURNFjvARR9jlk9LlyZXdFwKtgMYjG6m8V0Mxr2h7EN9mMbgMv1j6EeQb4oR2bPKr8SBKYAtprQn4iZUBgCVuKtomaWwWnKD/f4+hDtBgVyvuwLSGmtfB7ADflxEPJYhvph1PdFASHYlxhAooloYSyJJozWiwjF/uZlyEHlZGYnTN8ChuxZThI7QRw+MeBJbamEz3cyZZRY/uItet3Ha5RUK6lqZmM56VTL8/O1iHzi3xtiPe5yuVwuW2/3uEOg7CAMFwAAAABJRU5ErkJggg==","orcid":"","institution":"Nantong University","correspondingAuthor":true,"prefix":"","firstName":"Wei","middleName":"","lastName":"Zhang","suffix":""},{"id":412526981,"identity":"cff40f5d-6fed-46a6-910e-754c5cd108ac","order_by":3,"name":"Ruirui Jiang","email":"","orcid":"","institution":"Nantong University","correspondingAuthor":false,"prefix":"","firstName":"Ruirui","middleName":"","lastName":"Jiang","suffix":""},{"id":412526982,"identity":"3d08f876-2fb0-4725-993d-7874965d79c2","order_by":4,"name":"Jin Shi","email":"","orcid":"","institution":"Nantong University","correspondingAuthor":false,"prefix":"","firstName":"Jin","middleName":"","lastName":"Shi","suffix":""}],"badges":[],"createdAt":"2025-02-06 21:23:12","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-5976354/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-5976354/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1038/s41598-025-06780-6","type":"published","date":"2025-07-02T15:58:44+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":86180815,"identity":"fee1e397-f51b-49c2-aaed-2fb3f19bc806","added_by":"auto","created_at":"2025-07-07 16:22:45","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":3689462,"visible":true,"origin":"","legend":"","description":"","filename":"ScientificReportsDRFPD3.pdf","url":"https://assets-eu.researchsquare.com/files/rs-5976354/v1_covered_e4eae981-c5ef-40aa-84b6-c8e645461943.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Dual-Band Absorptive Bandpass Filters with All- Frequency Reflectionless Performance and Enhanced Upper-Band Suppression","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Dual-band, absorptive bandpass filter (ABPF), upper-band suppressions, reflectionless.","lastPublishedDoi":"10.21203/rs.3.rs-5976354/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-5976354/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThis paper presents a novel dual-band bandpass filter (BPF) with two-port all-frequency reflectionless characteristics and enhanced upper-band suppression. The design integrates a square ring resonator (SRR) and advanced coupled lines (CLs), incorporating complementary absorptive branches to achieve broadband reflectionless performance. To mitigate upper-band harmonics, radial-stub-loaded resonators (RSLSs) with high-impedance transmission lines (HITLs) are introduced, extending suppression up to 10f0 without significantly increasing the circuit footprint. A comprehensive theoretical analysis, including parametric studies and transmission zero (TZ) derivation, is conducted to optimize performance. Two prototypes are designed, fabricated, and tested: Prototype I achieves dual-band operation with all-frequency absorption, while Prototype II further enhances harmonic suppression. Experimental results closely align with simulations, with Prototype I exhibiting 3-dB fractional bandwidths (FBWs) of 19.5% and 9.7% at 1.38 GHz and 2.63 GHz, respectively, with insertion losses (ILs) of 0.95 dB and 1.47 dB. Prototype II achieves superior harmonic suppression, with attenuation levels of 22.8 dB over 2.9-20 GHz and 28.5 dB within 3.0–12 GHz. 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