How do I design the grounding scheme for a phased array antenna to minimize ground current EMI?

Designing the grounding scheme for a phased array antenna to minimize ground current EMI requires managing the return currents from hundreds or thousands of active elements (T/R modules, digital beamforming processors, power supplies) to prevent ground loops, common-impedance coupling, and radiated emissions from ground current flowing on the array structure. The design approach includes: star grounding at each T/R module (each module has a single-point ground connection to the array backplane, preventing ground loops between adjacent modules), separate ground planes for analog RF, digital, and power circuits (within each T/R module: the analog ground plane carries the RF return currents, the digital ground plane carries the clock and data return currents, and the power ground carries the high-current DC returns; these ground planes are connected at a single point near the T/R module's ground connection to the backplane), array backplane grounding (the array structure, typically a metal plate or frame, serves as the common ground reference; it must have low impedance across its entire surface at the operating frequency; use thick, continuous metal sheets rather than thin panels connected by bond straps), power distribution grounding (the DC power for the T/R modules flows through cables or bus bars with return paths that must be routed close to the supply paths to minimize loop area; use power/return pairs rather than single-wire distribution with chassis return), and cable shield management (every cable entering or leaving the array must have its shield terminated at 360 degrees to the array backplane at the point of entry, preventing external currents from flowing on the array structure).