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The space industry has shifted its focus to the development of low-cost satellites and large satellite constellations. Notably, most nano-satellites in low Earth orbit operate at UHF (P-band) frequencies to leverage the use of low-cost commercial off-the-shelf electronics. Such constellations would benefit from the rapid steering of multiple beams offered by a phased array antenna (PAA) ground station (GS). The cost of such systems, however, is not conducive to the low-cost philosophy of the satellites. While several universities have identified the need for a low-cost UHF PAA GS, no feasible design or prototype has yet been developed that is suitable for low-cost applications involving PAAs with a large number of elements. This paper proposes and demonstrates a subarray-digital architecture with a novel two-stage analog beamforming segment to optimize resource usage within the PAA, by allowing for the dynamic …