Phased Array with 45° Scanning and Over 65dB Polarization Purity from 53–100GHz Using PCB Flip-Chip Technology

Use of the millimeter wave spectrum is essential for the success of 5G and beyond communications. Modern millimeter wave arrays suffer from bandwidth limitations due to dielectric loadings. In this paper, the latter is compensated with a higher order Marchand balun in each element of a tightly coupled dipole antenna array (TCDA). The array operates from 53–100GHz at boresight with a VSWR < 2. When scanning 45° from broadside in the E and D-planes a VSWR < 3 is maintained, and the same holds for up to 30° in the H-plane. The array has an impressive cross-polarization purity of over 65dB across the bandwidth. Moreover, the array exhibits over 84% efficiency across the band. It is designed and fabricated on Tachyon ISO 100 and copper features are within commercial PCB limitations. Furthermore, the array is designed for flip-chip technologies and in a triangular lattice for 15% phase shifter count reduction.