Un Filtro Pasa-Bajo Nuevo en Topología Finline Asimétrica Utilizando Resonadores de Anillos Divididos (A New Low-Pass Filter in Asymmetrical Finline Topology Using Split-Ring Resonators)

Alain Leon (alainleon@electrica.cujae.edu.cu)1, Alicia Casanueva (alicia.casanueva@unican.es)2, Jaime Cagigas2, Angel Mediavilla2

1Instituto Superior Politécnico José A. Echeverría
2Universidad de Cantabria

This paper appears in: Revista IEEE América Latina

Publication Date: March 2012
Volume: 10,   Issue: 2 
ISSN: 1548-0992

A variation of the quasi-static equivalent circuit model formulation of miniaturized magnetic resonant structures ‑i.e., split-ring resonator (SRR)‑ is presented. The validity of this model is verified by means of an analytical model that uses a new, simple and accurate analytical design formula for the SRRs inductance, full-wave simulations and measurements. These structures are inserted on the opposite side of a compact low-pass filter (LPF) in asymmetrical finline consisting of several notches alternating with a number of single-ridge finline sections. A soft transition from metal waveguide to finline is guaranteed by tapering the finline slot employing a numerically adjusted expression. Finally, experimental results of the filter are presented in order to demonstrate the feasibility of the proposed structure.

Index Terms:
Asymmetrical finline, Low-pass filter, Metamaterials, Planar circuits, Split rings resonators   

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