Question
Which of the following conductors is preferred for bonding at RF?
Answer Options
- A) Copper braid removed from coaxial cable
- B) Steel wire
- C) Twisted-pair cable
- D) Flat copper strap
Correct Answer: D
Explanation
Bonding refers to connecting all equipment chassis and safety grounds together to ensure they are all at the same electrical potential. When dealing with radio frequency (RF) energy, conductors must have low impedance (opposition to AC/RF flow).
Flat copper strap is the best choice for this purpose. Because high-frequency currents tend to travel on the surface of a conductor (the skin effect), a flat, wide conductor offers significantly lower RF impedance than a round wire or braided cable of the same cross-sectional area. Lower impedance means that unwanted RF currents can be efficiently shunted to ground, reducing RF feedback and interference.
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