"强信号栅极" can be translated as "strong-signal grid" in English.
Here, "强信号" (qiáng xìn hào) is translated as "strong-signal," indicating a high or intense level of the signal, and "栅极" (zhà jí) is translated as "grid," which is a technical term in electronics, often referring to an electrode in a vacuum tube or similar device that controls the flow of electrons.
So, combining these two parts, we get "strong-signal grid."