urgentcomm » SMT

Technical techniques: A primer for transmission lines

Published Friday, February 01, 2002

For a PDF version of this story, which includes diagrams, click here. Transmission lines carry RF from point to point within radio equipment, between pieces of equipment and from equipment to antennas. They also can be configured as filters and impedance transformers. In simple terms, a transmission line connects the source of energy to the load. Transmission lines are either balanced or unbalanced. A two-wire transmission line becomes balanced when each conductor has equal impedance relative to ground or to its surroundings. An unbalanced transmission line has one conductor grounded, or exposed to the outside elements ...

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