4x4 Butler Matrix Design for Multibeam Operation for Radar Application

The 5G is the current requirement of the spectrum shortage and the coverage of the intended user/direction. The high data rate and the large number of users can be accommodated using 5G frequency bands. A beamforming 4x4 Butler matrix with multibeam for radar applications is designed for the 5G applications. The proposed 4x4 Butler matrix is designed with 2:1 VSWR on Rogers RO3003 substrate, having a dimension of 19.35 ×16 × 0.254 mm 3. The Butler matrix design covers 28.12-35.24 GHz (7.12 GHz bandwidth) and 28.55-36.35 GHz (7.77 GHz bandwidth) frequency bands with more than 7 dB isolation among different ports. The gain of antenna is moe than 7.5 dBi at the ports and its radiation efficiency is more than 70% obtained at different ports.