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An array is a combination of half-wave elements operating together as a
single antenna. It provides more gain and greater directivity than single
element antennas.
A driven array derives its power directly from the source.
A parasitic array derives its power by coupling the energy from other
elements of the antenna.
The bidirectional array radiates energy equally in two opposing directions.
The unidirectional array radiates energy efficiently in a single direction.
The collinear array has elements in a straight line. Maximum radiation
occurs at right angles to this line.
The broadside array has elements parallel and in the same plane. Maximum
radiation develops in the plane at right angles to the plane of the elements.
Figure 4-Sum 11. Broadside Array Elements
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