Abstract
We report a new design of triple-band electric metamaterial resonator (TBEMR) based on integration of open delta loops within square ring resonator. This metamaterial resonator has three distinct ε-negative regions (ENG) over C, X frequency bands. The transmission and reflection response of the proposed subwavelength resonator is analyzed using full-wave electromagnetic solver Ansys HFSS to demonstrate the presence of electrical resonances within frequencies 4–12 GHz. Effective medium parameters permittivity and permeability are extracted from simulated complex scattering parameters to verify existence of ENG regions. The investigations are also carried out regarding dependence of resonant frequencies on design parameters of the TBEMR unit cell. The effective medium ratio (λ0/a) for proposed subwavelength resonator is compared with various other metamaterial resonators to indicate its compact nature.
Highlights
Metamaterials are artificially structured composites made of subwavelength resonators that exhibit unique electromagnetic properties not found in individual constituent components
The effective medium parameters permittivity, permeability, and refractive index are obtained using the above formulation for the proposed triple-band electric metamaterial resonator (TBEMR) metamaterial resonators as shown in Figures 4(a), 4(b), and 4(c), respectively
This happens because the capacitance formed between coplanar metallic strips in the structure increases with increase in the permittivity of the substrate, thereby lowering resonant frequency
Summary
Metamaterials are artificially structured composites made of subwavelength resonators that exhibit unique electromagnetic properties not found in individual constituent components. A pair of E-LCs resonators with different sized inductive loops and capacitive gaps were shown to have two distinct electric resonances [24, 25] Shortfalls in these designs are poor coupling to external field at higher resonant frequency [24] and use of high permittivity material as substrate [25]. The effective medium parameters permittivity, permeability, and refractive index are obtained using the above formulation for the proposed TBEMR metamaterial resonators as shown in Figures 4(a), 4(b), and 4(c), respectively. The increased resonant frequency f03 as against f02 is due to decreased value of inductance Le3 and capacitor C3
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