Digital beam forming (DBF) architectures require a high degree of integration of a large number of components and high speed digital signal processing units. However, real-time processing of thousands of antenna signals remains impractical. IMST is currently investigating alternative topologies that are combinations of phased array and DBF architectures. The goal is to reduce the computational workload by reducing the number of interconnections between RF components and digital logic. Instead of steering each antenna element separately, one can also steer the array per row/column, which is important for large arrays: the larger the array, the fewer input/output antenna signals are required. Steering per row/column can be achieved by RF phase shifters or on a digital signal level. Our ongoing research will establish the best possible anyone could doconfiguration by a combination of RF and digital hardware.