in this paper, a sub-6 beam-steerable antenna array system is introduced. The main radiating element in the proposed array is a gain-enhanced Vivaldi antenna, whose overall realized gain is improved by introducing near-zero-index metamaterial [NZIM] with broadband characteristics at 3.6 GHz. The proposed system is intended to be integrated with fifth-generation (5G) automotive applications. The 4x4 butler matrix is resonating at 3.6 GHz to feed the designed antenna array elements and steer the radiating beam, which is suitable for automotive applications. All the system components, including antenna elements and the [4x4] butler matrix, are designed, simulated, and optimized by using CSTMWS 2020 and HFSS. In order to verify the proposed design, the system is fabricated using the photolithographic technique. The experimental results show very good agreement with the simulated ones. The NZIM-loaded antenna element achieves a -10 dB bandwidth of 2.9 GHz, while the overall array system achieves a 600 MHz bandwidth. The steered beam of the proposed system has an overall realized gain of 11.2 dB and covers an angle from 45o to 135o.

This paper presents the design of a Chebyshev linear antenna array (CLA) integrated with the dielectric lens. In comparison to a uniform amplitude distribution (UAD), a Chebyshev amplitude distribution (CAD) is used to achieve a low side lobe level (SLL) characteristic and increase the directivity of the antenna array. The proposed CLA is optimized to operate at a high fifth generation (5G) frequency. The proposed CLA achieves a -10 dB broadband width from 25.8 GHz to 42.4 GHz. The dielectric lenses can be employed to modify the phase and amplitude of the antenna array, which increases the realized gain and leads to stable radiation over the operational bandwidth. The main purposes of the dielectric lens are to improve the realized gain, enhance efficiency, and result in stable radiation pattern properties. The CLA is integrated with an epoxy resin dielectric lens, which has a relative permittivity (εr) of 2.716. The proposed CLA integrated with a dielectric lens has a realized gain of 15.2 dB at 28 GHz and 11.94 dB at 38 GHz, respectively. The proposed design is simulated using CSTMWS2020 and HFSS. However, to verify the obtained results, the proposed design is fabricated using a photolithography process technique, and the dielectric lens is fabricated using a 3D printing technique.