In this paper, a metamaterial antenna operating at a frequency of 5.8 GHz is presented. Metamaterial superstrate cover acts as a lens which focuses the EM radiations due to the unusual properties of the metamaterial.This leads to improvement performance of patch antenna along with its physical protection.The proposed metamaterial lens consists of a double layer of 9-by-9 matrix of Split-Ring Resonators (SRRs), and is positioned above a probe-fed rectangular patch resonating at 5.8 GHz. The structure improve the gain and directivity of a simple patch antenna up to 7 dB.Simulation results of the proposed antenna are presented and discussed in this letter.
In this paper a multifunctional patch antenna loaded with near zero index refraction metamaterial (NZIM) is presented. This multifunctional antenna operates at 5.8 GHz and provides high gain and beam steering capability. The proposed configuration comprises a patch antenna placed below an NZIM superstrate. The rectangular microstrip antenna is used as a radiation source to demonstrate the performance of this design. The NZIM superstrate, which behaves as an NZIM, based on 9 × 9 resonating unit cells of split ring resonators (SRRs), allows gathering radiated waves from the antenna and collimating them toward the superstrate's normal direction, which results in gain enhancement. The beam-steering in the E-plane is obtained by slowly tilting the NZIM over the patch antenna. The main characteristics of the antenna placed near the NZIM superstrate are studied numerically and experimentally to successfully demonstrate this dual function feature. It is found experimentally that the gain enhancement of 8 dB with improved directivity and radiation efficiency are obtained in comparison with the antenna without the NZIM metasurface. In addition, we were also able to steer the direction of the main beam just by tilting the NZIM superstrate from −20 • to 20 • with a gain variation of 5 dB and without changing the whole dimension of the structure.
Beam-steering antenna is essential and widely used in communication system.The design of 28 GHz beam steering phased array antenna for 5G millimeterwave application presented in this communication. The objective of this research is to investigate and implement a phase shifter in a linear antenna array for angle scan. The proposed array antenna has four microstrip patch antenna elements, each feed ports are connected to phase shifter. The main mechanism of radiation is due to the excitation of element in sequence with different phase delays. The overall radiated beam can be steered to different directions depending on the initial excitation of elements. In the first, 3-D good radiation by 0° phase. In the second, good scanning performance of a range of ±10° to ±40°, acceptable side lobe level and gain of 12.1 dB are obtained.
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