Design of circular patch antenna with a high gain by using a novel artificial planar dual‐layer metamaterial superstrate

Abstract

This study presents a new dual-layer metasurface structure proposed to enhance the performance of a circular patch antenna. A novel unit cell planar metasurface is characterized by nearly equal enhanced effective permeability and permittivity ε r ffi μ r > 1 at the resonant frequency. In addition, a 5*5 array of these unit cells are used as a superstrate over a circular patch antenna which is fed by 50 Ω microstrip line and operating at 2.45 GHz for improving the antenna performance. The patch antenna gain is increased by creating an in-phase electric field area on the top surface of the metasurface. The obtained results showed that the maximum gain of the antenna increased from 2.31 dBi to 7.5 dBi. A 30% increase in the bandwidth is also remarked. The proposed antenna with metasurface occupies an overall volume of 1.01λ g ×1.01λ g ×0.025λ g . The simulation analysis and measured results were performed using the microwave studio, high frequency structure simulator software, and vector network analyzer. The proposed antenna prototype has been fabricated. The measured results indicate that the antenna has a good impedance matching in the desired operating band (2.37-2.49 GHz) with the resonant frequency of 2.44 GHz which make the proposed antenna appropriate for microwave applications. K E Y W O R D S artificial planar metamaterial superstrate, circular patch antenna, gain enhancement, ISM 2.45 GHz, metasurface

Analysis and Design of a High Gain Multiband Antenna Based on Metamaterials for RFID Applications

“…For all these structures, the maximum achievable gain is of the order of 2-6 dB in the UHF and SHF bands, which is not suitable for RFID application because the antenna, which has low performance in terms of gain and directivity, may cause tag detection errors or losses in the supply network in other applications, thus limiting the range of applications. There are numerous techniques based on metamaterials that can be employed above [28], or inside the radiating element [29][30][31]. However, only a single band has been successfully achieved around 2.4 GHz, with a maximum gain of 6 dB, at the expense of increased size.…”

Gain Enhancement in Microstrip Patch Antenna With High Negative Refractive Index 3D-Metamaterial Inspired Superstrate for Wireless Applications

“…The maximum gain is improved in the lower resonance band around 3.69dBi [23]. A circular patch antenna loaded with a double-sided nested split ring resonator exhibiting positive refractive index resonating at 2.45GHz, resulting in a 5 dBi gain enhancement [24]. A negative index four-layer ELC MTM superstrate achieves a high gain and wideband antenna.…”