Design of wide-band semi-lumped bandpass filters using open split ring resonators

Jesús Martel, Jordi Bonache, Ricardo Marqués, Ferran Martín, Francisco Medina

Research output: Contribution to journalArticleResearchpeer-review

30 Citations (Scopus)


Open split ring resonators (OSRRs) are used in this letter to design wide-band semi-lumped bandpass filters. OSRRs work as lumped LC series elements due to their small electrical size and can be then used as building blocks of reduced size band pass filters. The values of the capacitance, C, and inductance, L, of the OSRR are controlled by adjusting the geometrical parameters of the coupled open rings. In our design, the OSRRs are connected through quarter-wave lines which act as inverters. The impedance of these inverters have been conveniently calculated to achieve the filter specifications. Finally bending and/or meandering techniques have been applied so as to obtain highly compact designs. Experimental verification is provided and good agreement has been found between electromagnetic simulations and measurements. © 2007 IEEE.
Original languageEnglish
Pages (from-to)28-30
JournalIEEE Microwave and Wireless Components Letters
Publication statusPublished - 1 Jan 2007


  • Open split ring resonators (OSRRs)
  • Wide-band bandpass filters


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