Discussion
What distinguishes a travelling wave antenna from a standing wave one?
Answer: D
A resistively terminated wire carries current in one direction only, with no reflection and so no standing wave, which gives a broadband unidirectional pattern at the cost of the power absorbed in the termination. Rhombic and Beverage antennas work this way. Length and feed position are secondary, and no antenna radiates from direct current. The trade of efficiency for bandwidth and pattern is the defining characteristic of the whole travelling wave family.
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