Search

In this article, a beam steering millimeter-wave antenna array operating in ka-band frequency has been proposed for 5G applications. Thus, to achieve a beam switching and to ensure a low side lobe level (SLL), a 4 × 4 Butler matrix (BM) and a Chebyshev array are used respectively. Moreover, to minimize the antenna array dimensions, a multilayer structure is used, where the BM and the antenna array are printed on the bottom and the upper layers respectively. The two radio frequency structures are connected by using via connectors. Furthermore, to reduce the mutual coupling between the antenna elements, we have used a metamaterial surface (metasurface) composed by periodic complementary split ring resonators (CSRRs) printed on the back side of the top layer. As a result, enhancements of the radiation pattern in the E-plane and an impedance matching improvement have been achieved. In addition, a beam steering in the range of − 6° to + 27°, with a variation of the main lobe magnitude from 11.5 to 13.5 dB, and a multi-band behavior in the frequency range 25–40 GHz, have been achieved. [ABSTRACT FROM AUTHOR]