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Antennas used in wireless communications must have omnidirectional radiation in both horizontal plane and low profile, and are required to have omnidirectional radiation in horizontal plane and low profile. We developed a novel high gain antenna with near-zeroindex metamaterial in this paper. By 1. 30 dBi, the horizontal gain of antenna with omnidirectional radiation has been increased. In addition, the rate of horizontal gain increases as the refractive index of NZIM units rises.
The phase velocity in the metamaterial lens is higher than that of the phase velocity along the antenna's axis for the same propagation distance, so the phase distribution at the aperture is similar, with the gain of the shorter horn antenna increasing. An antenna with a metamaterial lens has the same radiation characteristics as that of an antenna with the correct length in the desired frequency band.
To increase the radiation characteristics of antipodal Vivaldi antennas, a metamaterial with composite structure is introduced in this paper. In the frequency band of 1–8 GHz, Metamaterial layers, which have a higher permittivity than substrate, are used to direct the electromagnetic waves propagated from the AVA's sides to the end-fire direction.
A novel approach based on the metamaterial concept has been suggested to increase the gain of a planar array antenna without increasing the size for millimeter wave femtocell assembly, which can inexpensively replace costly macrocells. To improve the gain of a millimeter-wave two-layer array antennas, sixteen novel metamaterial unit resonators called split cylinder metamaterial resonators have been used to implement the new procedure and display its benefits. Compared to a sample array antenna in which no metamaterial structures are used, providing an effective metamaterial environment by the new SCMRs increases the antenna's gain by more than ten dB in the operating frequencies. The average gain of the new antenna in the operating frequency band is equal to 17 dB. The most accurate of the full-wave simulation was verified by a simulation, so the detailed two-layer array antenna was constructed and tested.
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