Abstract
An ultra-wideband Epsilon-Near-Zero (ENZ) metamaterial, which has a close to zero permittivity, is introduced. The proposed structure functions as ENZ within the frequency range of 10.5–20 GHz. The loss is almost zero within this frequency range. It also acts as a negative index material (NIM), which has a negative refractive index, within 7–8.5 GHz with zero loss. The structure is composed of a Split Ring Resonator (SRR) and a rod. Unlike our structure that is an ENZ in a very wide frequency range, the conventional SRR-rod structure has wideband Mu-Near-Zero (MNZ) property within the 11–20 GHz and it's ENZ just at 12.5 GHz. Therefore, our wideband ENZ structure could be complementary for that conventional wideband MNZ structure. We obtain the S-parameters of the structure from HFSS scattering simulation results. Then, an electromagnetic parameters retrieval method is used to extract the effective constitutive parameters of the structure from the S-parameters to show that the structure is an ultra-wideband ENZ material.
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