Superconducting Shields is a technology in Clone Campaigns that can be researched at the Shield Generator in Tech Level 3. It costs 300 Nova and 100 Ore, and causes shields to degenerate slower when units leave the Shield Generator's area of effect.
"This Tech Level 3 technology, available at your Shield Generator structures, makes them more efficient than before by decreasing shield recharge times for units and structures within range. Furthermore, the Superconducting Shields technology increases the time it takes for the effect of shielding to wear off on units that move beyond the range of a Shield Generator."
—Manual description