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RF Ground Conductors

November 17th Fact-of-the-Day

Low impedance connections between radio equipment and a good ground system are important to the operation of some types of antennas and tend to reduce interference to and from other services. However, large gauge copper wire is heavy, difficult to bend, and expensive. Copper water pipe is a good substitute. RF currents flow mostly near the skin of a conductor, so the RF impedance of copper pipe is almost the same as for solid copper wire the same diameter. Copper pipe is light, easy to work with, and much less expensive. Copper tubing is even cheaper and easier to work with, but has higher impedance per unit length, because of its smaller diameter. ©2004 Martek, International. All rights reserved.

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