Abstract
In this work, transmission characteristics of rectangular split-ring resonators with single-split and two-splits are analyzed at microwave frequencies. The resonators are coupled with monopole antennas for excitation. The scattering parameters of the devices are investigated under different polarizations of E and H fields. The magnetic resonances induced by E and H fields are identified and the differences in the behavior of the resonators due to orientations of the fields are explained based on simulation and experimental results. The addition of the second split of the device is investigated considering different configurations of the excitation vectors. It is demonstrated that the single-split and the two-splits resonators exhibit identical transmission characteristics for a certain excitation configuration as verified with simulations and experiments. The presented resonators can effectively function as frequency selective media for varying excitation conditions.
Highlights
Metamaterials are artificially engineered structures that exhibit unique properties such as having negative values of permittivity and permeability simultaneously in a specific frequency band, resulting in negative values of index of refraction.[1,2,3] These structures usually operate at resonance and their resonant frequencies depend highly on the geometry of the structure
We present modeling and experimental characterization results for rectangular split-ring resonators with a single split and two-splits that operate at microwave frequencies between 1 and 5 GHz
Different excitation conditions are imposed on the resonators that result in different resonance behavior
Summary
Metamaterials are artificially engineered structures that exhibit unique properties such as having negative values of permittivity and permeability simultaneously in a specific frequency band, resulting in negative values of index of refraction.[1,2,3] These structures usually operate at resonance and their resonant frequencies depend highly on the geometry of the structure. Different designs have been introduced in the field of metamaterials and the most conventional ones are circular and rectangular split-ring resonators. These are investigated regarding different performance parameters such as sensitivity for sensing applications. Rectangular designs are capable of providing higher sensitivity when they are employed for sensing applications.[19] rectangular resonators are more suitable for miniaturization and dense packing as compared to circular structures.[19] In addition, some modifications have been introduced to conventional designs such as fabricating multi-gap rectangular or circular split-ring resonators. We present rectangular split-ring resonators that operate at microwave frequencies.
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