Ferdinand-Braun-Institut gGmbH occupies a strategically important position in the European technology base because it operates where semiconductor process capability, high-frequency electronics, and defence-relevant system performance converge. Its significance does not lie in platform production, but in the upstream mastery of compound-semiconductor devices and microwave processes that condition what European industry can design, manufacture, and sustain in radar, spectrum-intensive defence applications, and advanced communications. In an environment shaped by rearmament, contested supply chains, and a sharper policy focus on autonomy-oriented procurability, the institute represents a form of industrial leverage that is easy to overlook but difficult to replace: the capacity to anchor critical GaN know-how, device engineering, and integration pathways within a European perimeter. That makes it a relevant subject not only for technology assessment, but for any serious judgement about Europe’s ability to reduce external dependencies in strategically sensitive electronic subsystems.