{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9786331","patent":{"patent_number":"US-9786331","title":"Shielded three-layer patterned ground structure","assignee":null,"inventors":[],"filing_date":"2016-07-26T00:00:00.000Z","publication_date":"2017-10-10T00:00:00.000Z","cpc_codes":["G11B","G06F"],"num_claims":22,"abstract":"The present disclosure generally relates to a shielded three-layer patterned ground structure in a PCB. The PCB may be disposed in a hard disk drive. To reduce costs, PCBs are being made with only four total layers separated by dielectric material. Conductive traces in PCBs can have the problem of common mode current flowing through the traces and thus increasing the magnitude of EMI noise. By providing a shielded three-layer patterned ground structure, not only is the cost reduced, but so is the common mode current and the magnitude of EMI noise, all without any negative impact to the differential signal."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Shielded three-layer patterned ground structure","description":"The present disclosure generally relates to a shielded three-layer patterned ground structure in a PCB. The PCB may be disposed in a hard disk drive. To reduce costs, PCBs are being made with only fou","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9786331","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9786331","citation_suggestion":"Patentable. \"Shielded three-layer patterned ground structure\" (US-9786331). https://patentable.app/patents/US-9786331","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9786331","json":"https://patentable.app/api/llm-context/US-9786331","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:36:31.164Z"}