Design and Implementation of a New 4 × 4 BFN Using Multi‐Aperture and Multislot Coupler for 5G Application

This paper proposes a 4 × 4 beamforming network (BFN) using a novel configuration. The proposed architecture utilizes a two‐layer multi‐aperture and multislot coupler (MA/MSC). Power coupling between ports within each layer is achieved through designed apertures. Additionally, power distribution between the upper and lower layers is facilitated by the embedded slots between the two layers. To validate the performance of the proposed design, a four‐beam antenna is fabricated by connecting a 4 × 2 SIW slot antenna to the BFN. The satisfactory performance of the proposed BFN is validated through antenna measurements. Compared with conventional designs, the proposed BFN offers several advantages: fewer components, elimination of crossovers, and compact size (approximately 20 mm × 38 mm). These features make it highly suitable for fifth‐generation (5G) wireless communication applications due to its size and simplicity.