Effects of the earth. Reciprocity, receiving antennas, effective length and area. Moment methods. Arrays: collinear, broadside, endfire. Array synthesis. Mutual coupling. Log-periodic and Yagi arrays.

By alternating the operating mode (from broadside to end-fire) of the antenna it can be ... These antennas have moderate inherent directivity, but arrays can be better tuned for specific directions.

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Charlie Hall is Polygon’s tabletop editor. In 10-plus years as a journalist & photographer, he has covered simulation, strategy, and spacefaring games, as well as public policy. “He’s ...