| 单词 | shield |
| 释义 | shield A covering, sheath, or screen designed to protect a signal traveling over a conductor from electromagnetic interference (EMI) due to the unwanted coupling of extraneous signals.The shield is in the form of a conductive metal foil, screen, or braid that surrounds a conductor or group of conductors. A dielectric material insulates the conductors from each other and from the shield, which essentially is an outer conductor that intercepts extraneous signals and conducts them to ground. Therefore, the shield must be continuous and must be grounded via a ground wire, or drain wire.To ensure electrical continuity, the shield must be bonded at any splice points and the shield must be bonded to the ground wire, strap, or rod. Coaxial cable, screened twisted pair (ScTP), and shielded twisted pair (STP) are examples of shielded transmission media in telecommunications applications. See also coaxial cable, dielectric, EMI, ground wire, ScTP, and STP. |
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