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Study of equivalent circuits for open-ring and split-ring resonators in coplanar waveguide technology

Study of equivalent circuits for open-ring and split-ring resonators in coplanar waveguide technology

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A study of open-ring resonators and split-ring resonators is performed in terms of equivalent circuits. The resonant particles can be intrinsically described by simple LC circuits; even if their resonant behaviours are caused by conceptually different phenomena, either distributed or quasi-static resonances can be attributed for designs with similar geometrical dimensions. When inserted on the back-plane of a coplanar waveguide, and combined with short-circuiting wires on the top-plane, the periodic structures designed so far exhibit a certain pass-band where backward waves are generated. The left-handed behaviour is proved through the analysis of the phase of different length transmission lines and can be observed for both types of resonators. Full-wave simulations and experimental results performed on manufactured prototypes validate the overall good performance of the proposed equivalent circuits. Detailed models for the different elements of the unit-cells are provided on the basis of different analytical approaches.

Inspec keywords: coplanar waveguide components; equivalent circuits; metamaterials; resonators

Other keywords: split-ring resonators; left-handed behaviour; backward waves; equivalent circuits; open-ring resonators; coplanar waveguide technology

Subjects: Waveguide and microwave transmission line components; Microwave materials and structures

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