Abstract
A gap coupled hexagonal split ring resonator (GCHSRR) based metamaterial is presented in this paper for S-band and X-band microwave applications with absorptance. This gap coupled hexagonal split ring resonator is the amendment of the typical split-ring resonator (SRR). Three interconnected hexagonal split ring resonators are applied with a stripline to increase the electrical length and coupling effect of the GCHSRR. SRR has an impact on the extraction of effective parameters such as permittivity, permeability and refractive index. The dimension of the proposed GCHSRR unit cell is $10\times 10$ mm 2, which is printed on low-cost FR4 material. The transmission frequency of the proposed GCHSRR unit cell ranges from 3.42 GHz to 3.73 GHz and 11.27 GHz to 11.91 GHz, which makes the metamaterial applicable for S-band and X-band microwave applications. The GCHSRR unit cell has a double negative regime of 7.92 GHz to 9.78 GHz with an effective negative refractive index regime of 6.30 GHz to 10.22 GHz and 11.97 GHz to 12.61 GHz. The effective medium ratio is 8.4, which implies the novelty of the proposed design. Moreover, the GCHSRR has high absorption peaks of 99%, 98%, and 81% at 4.27 GHz, 5.42 GHz, and 12.40 GHz, respectively. An $18\times 20$ GCHSRR array structure is also designed and studied. The effective parameters and the effective medium ratio with a high absorptance make the proposed GCHSRR based metamaterial suitable for practical microwave applications.
Highlights
Wave-matter interactions like X-ray diffraction, infra-red spectroscopy or magnetic resonance lead to the advent of a new area of artificial media, which is called metamaterials
left-handed materials (LHM) can be categorized as double negative metamaterials (DNG) and single negative metamaterials (SNG), often formed by the split ring resonators (SRR) [3], [4] and embedded conducting thin wires for a specific frequency range
A thin frequency selective surface based on rectangular SRR has been proposed at [15] where the metamaterial is composed of subwavelength electromagnetic structures which operates at X-band and Ku-band
Summary
Wave-matter interactions like X-ray diffraction, infra-red spectroscopy or magnetic resonance lead to the advent of a new area of artificial media, which is called metamaterials. A thin frequency selective surface based on rectangular SRR has been proposed at [15] where the metamaterial is composed of subwavelength electromagnetic structures which operates at X-band and Ku-band. An Agilent N5227 Vector Network Analyzer (VNA) connected with waveguide ports to co-axial adapters have been used to measure the scattering parameters (reflection and transmission coefficient) of the proposed GCHSRR unit cell structure. N4694-60001 calibration kit is used to calibrate the VNA for measurement accuracy
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