Subspace field
From Memory Alpha, the free Star Trek reference.
Subspace fields can be generated by accelerating plasma through the driver coils of an impulse drive; this improves the propulsive effect. They are also generated by accelerating plasma through the warp coils of a starship's warp drive to achieve faster than light velocities.
The sensors of the runabout were unable to get through a subspace field, caused by a temporal fragment. (TNG: "Timescape")
A large subspace field was used to assist in moving Deep Space 9 from its orbit around Bajor to the Bajoran Wormhole. (DS9: "Emissary")
Subspace field emitters are a part of starships. (DS9: "The Homecoming")
If a high-energy output is used in the generation of a subspace field; it can be used to jam sensors. (TNG: "The Wounded")
