A Scalable Dual-Band Dual-Beam Phased Array Leveraging InterleavedSparse Subarrays for 6G FR3 Communications

This work presents an N×N scalable phased array architecture that supports simultaneous independent beams at X and Ku bands for 6G FR3 communications. The design is based on interleaved sparse subarrays at X and Ku-bands sharing the same aperture on a single printed-circuit board (PCB) while maintaining independent operation. The subarray configurations allow the X and Ku beams to provide the angular resolution of the full aperture while scanning up to ±60° in all planes without triggering grating lobes. The fabricated array achieves measured bandwidths of 6.8-8.4 GHz and 11.4-14.2 GHz for the two subarrays with peak Rx electronic gains of 19.0 dB and 25.4 dB respectively. Better than 26 dB of isolation is attained between the subarrays. This interleaved architecture has applications in 6G base station design and can provide multiple simultaneous data streams and spectrum flexibility from the same aperture in low power and low cost systems.