Microwave filters with improved stopband based on sub-wavelength resonators

By Joan J. Garcia-Garcia, Ferran Martín, Francisco Falcone, Jordi Bonache, Juan Domingo Baena, I. Gil, E. Amat, T. Lopetegi, Miguel A. G. Laso, José Antonio Marcotegui Iturmendi and 2 more. IEEE transactions on microwave theory and techniques, 2005

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Novel microstrip bandpass filters based on complementary split-ring resonators (2006, background): “The possibility to fabricate planar LHMs based on CSRR by simply adding series gaps in CSRR transmission lines has also been demonstrated [14].”
On the electrical characteristics of complementary metamaterial resonators (2006, background): “Also, it has been demonstrated by the authors that CSRRs can be efficiently applied to the suppression of spurious bands in planar circuits [10], [11].”
Mutual Coupling Reduction Between Microstrip Patch Antennas Using Slotted-Complementary Split-Ring Resonators (2010, methodology): “An alternative demonstration of the band-gap behavior of the SCSRR is possible by computing the scattering parameters of a microstrip transmission line placed over the aforementioned dielectric substrate and backed by three SCSRR inclusions, in a manner identical to the experiments discussed in [7].”