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C h a p t e r 2 POWER AND RF AS SYSTEM BOTTLENECKS Given current trends, power delivery and RF performance have become primary constraints on satellite payload capability. Digital processing continues to scale, but power dissipation and heat removal limit usable performance. At the same time, RF front ends define link margin, coverage flexibility, and overall system stability. Because of these realities, designers are forced to size payload architectures around thermal limits rather than peak compute or RF output. Power systems, therefore, must convert, distribute, and regulate energy efficiently to minimize losses under extreme thermal gradients. RF subsystems further intensify these constraints by concentrating high power density into Moving away from traditional mechanical dishes powered by a single, massive amplifier, modern satellite designs utilize flat-panel phased arrays to achieve rapid, electronic beam steering. This architectural shift relies on the dense integration of thousands of low-power Transmit/Receive modules that dynamically shape the RF signal, demanding exceptionally precise phase and amplitude matching. Furthermore, because packing so many active amplifiers into a compact space generates heat spots, strict thermal management is now a primary bottleneck in array design." compact footprints. For example, power amplifiers and phased-array elements generate significant localized heat. Without efficient power conversion, these devices will raise junction temperatures, increase the risk of thermal runaway, and degrade long-term reliability. Packaging and integration, therefore, are non-negotiable. Heat removal depends on predictable thermal conduction paths, and engineers need to select packages that dissipate heat consistently across the specified temperature range. For instance, flat thermal interfaces can simplify heatsinking and mechanical integration to reduce uncertainty in thermal performance. Gianluca Furano Senior Data Systems Engineer, European Space Agency 12 11 Experts Discuss Designing Space Electronics for the New Space Race