Effective negative-ε stopband microstrip lines based on complementary split ring resonators

Francisco Falcone, Txema Lopetegi, Juan D. Baena, Ricardo Marqués, Ferran Martín, Mario Sorolla

    Research output: Contribution to journalArticleResearchpeer-review

    648 Citations (Scopus)


    In this letter a super-compact stopband microstrip structure is proposed. The frequency gap is produced by an array of complementary split ring resonators (CSRRs) - a concept proposed here for the first time - etched on the ground plane. This behavior is interpreted as due to the presence of a negative effective dielectric permittivity in the vicinity of resonance. The resulting device produces a deep rejection frequency band with sharp cutoff, and a pass band that exhibits very low losses and good matching. Due to the sub-lambda operation of CSRRs, the electrical size of the device is very small.
    Original languageEnglish
    Pages (from-to)280-282
    JournalIEEE Microwave and Wireless Components Letters
    Publication statusPublished - 1 Jun 2004


    • Complementary split ring resonators (CSRRs)
    • Duality
    • Microstrip technology
    • Microwave filters
    • Negative-ε
    • Split ring resonators


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