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A systematic method for the e-cient design of narrowband fllters founded on the extraordinary transmission via single flshnet structures (SFSs) is presented in this paper. Essentially, due to its strong resonant behavior, this phenomenon is proven suitable for the implementation of high-Q devices. The new design formulas are derived through the combination of full-wave numerical simulations and curve fltting algorithms. Also, adequate mathematical criteria are deflned for the evaluation of the fllters' linear performance, indicating that the transmitted electromagnetic waves remain practically undistorted in the frequency band of interest. Then, by exploiting the previously developed relations, proper correction factors are introduced in the existing SFS equivalent circuit expressions, which hardly increase the overall computational complexity. This quantitative modiflcation leads to an enhanced characterization of SFSs, as key components for diverse applications. Finally, several limitations as well as possible ways of extending the featured algorithm to more complicated structures and higher frequency bands are brie∞y discussed.

ENHANCED DESIGN OF NARROWBAND FILTERS BASED ON THE EXTRAORDINARY TRANSMISSION THROUGH SINGLE FISHNET STRUCTURES