Spiral Resonators
Abstract
- In this talk I will be presenting an overview of recently proposed spiral resonators
and several applications of interest. In the first part, I will briefly talk about the similarities and
dissimilarities between the spirals and periodic electromagnetic bandgap structures. I will
compare several defect-ground type structures used as filters. In the second part, I will try to
explain the operating principles of the spirals. I will show examples of their applications in
harmonic suppression of an antenna, microstrip duplexer and coplanar waveguide duplexer.
Finally by exhibiting their negative effective permeability, I will conclude that these spirals are
indeed meta-material particles when excited by proper electromagnetic fields in space. I will
also present a left-handed aka negative refractive index medium consisting of metal spirals
and strips.
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