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We present here the design, fabrication and numerical as well as experimental results of a low-profile hybrid Wood zone plate fishnet metamaterial lens working at ƒ = 99 GHz. The fishnet metamaterial with effective refractive index close to zero (n = 0.51) acts as an anti-reflecting layer as well as a beam shaper, increasing the overall efficiency while maintaining low profile, low cost and ease of...
In this work the design of an ultrathin carpet cloak based on a metasurface with ring resonators is demonstrated. The scattering from a triangular bump of a Gaussian beam is suppressed by manipulating the reflection phase along the edge of the bump. This is achieved by an array of closed ring resonators with varying radii. The object to hide can be placed under the bump on a flat ground plane. The...
In this work we present the design, numerical and experimental results for an ultrathin Soret fishnet metamaterial lens working at fexp = 96.45 GHz. The fishnet metamaterial with effective refractive index close to zero (n = −0.06) is introduced on the back side of the classical Soret lens in order to improve its efficiency. The experimental results are in good agreement with simulation results and...
Reduction of first side-lobe level (SLL) and nulls in artificial fishnet metalenses is accomplished here by applying the reference phase concept along with the zoning technique. Higher focusing efficiency is achieved for a specific reference phase when comparing numerically and experimentally four different designs. For such best design, an improvement of the first SLL (${\sim}\mathbf{2.4}\;{\mathbf{ dB}}$...
In this work, different approaches for enhancing radiation properties of phased-array antennas based on metamaterials (MTM) are presented. In case of antenna front-end technology, efforts have been done in designing metaradomes for mitigation of the blind-spot effect inherent to the periodic structure of phased arrays and in designing a compact series feeding network.
In this paper, a planar antenna for application in 3G and 3.5G mini cell application is presented. The antenna is based on the use of Extraordinary Transmission principle commonly used in IR and THz regime downscaled to the microwave frequency region. Full Wave FDTD simulations with in-house codes as well as measurement results are presented, showing good agreement. The resulting antenna offers competitive...
In this work we explore in the microwave regime the modification of the radiation pattern of a commercial horn antenna when 1 and 4 stacked subwavelength hole arrays are placed as a superstrate. We report a clear enhancement of the E-plane while the H-plane remains almost unaltered when either 1 or 4 layers are inserted. We link the results with the current density excited in the output face of the...
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