Abstract
In this paper, we present a low-profile selective-transmittance resonant structure developed with artificial magnetic conductor (AMC) metamaterials. A planar AMC is used for the two reflectors of the structure. The two reflectors cause no phase shift on reflection at the resonance frequency. The cavity can have zero thickness due to this in-phase reflection. The overall thickness of the structure is only 1.626 mm, which is less than 1/18 of the resonance wavelength. The electromagnetic characteristics of the resonant structure were simulated using simulation software. The simulated maximum transmittance was 0.999 at 9.72 GHz, with the electric field being localized at the interface of the two AMC layers. The measured maximum transmittance was 0.941 at 9.64 GHz. The experimental results are therefore in good agreement with the simulation results. The developed system can excite the interface mode at the resonance frequency and achieve near-perfect transmission of electromagnetic waves.
Highlights
Metamaterials are artificial structures that exhibit novel electromagnetic properties not commonly found in nature.1–3 Examples include double-negative metamaterials (DNMs) and singlenegative metamaterials (SNMs).4–9 The class of SNMs includes epsilon-negative metamaterials (ENMs) with negative permittivity and mu-negative metamaterials (MNMs) with negative permeability
No perfect MNMs exist in nature, but recent studies have shown that some artificial metal microstructures can achieve in-phase reflection
If we use two artificial magnetic conductor (AMC) metamaterial layers to form a resonant structure, the electromagnetic wave can be localized at an interface with a thickness of approximately zero
Summary
Metamaterials are artificial structures that exhibit novel electromagnetic properties not commonly found in nature. Examples include double-negative metamaterials (DNMs) and singlenegative metamaterials (SNMs). The class of SNMs includes epsilon-negative metamaterials (ENMs) with negative permittivity and mu-negative metamaterials (MNMs) with negative permeability. No perfect MNMs exist in nature, but recent studies have shown that some artificial metal microstructures can achieve in-phase reflection. These materials are known as artificial magnetic conductor (AMC) metamaterials.. For a single-layer AMC, the dispersive reflection phase change is ∼0○, which leads to a reduction in the thickness of the cavity to less than 1/4λ.21–25. Because of the lack of phase change, the thickness of the resonant cavity can be reduced to zero so that the electromagnetic field is locally enhanced at the interface of the two layers.
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