The Disruption Field is a vital defense in fleet management, designed to shield your territory from hostile corporations. When an enemy fleet enters your grid, the field activates, creating a barrier that restricts their movement, preventing the invading ships from maneuvering in the area.
You unlock this personal structure by upgrading your homebase to level 8 and constructing the Defense Control System, which you find under the Defense section.
To create a disruption field, you have to select one of the captured fields and choose "Assemble". From there, select Disruption Field.