_______________________________________________________________________ Antennas
The end-fire array has elements parallel to each other and in the same plane.
Maximum radiation occurs along the axis of the array.
Figure 4-Sum 12. End-Fire Array
Matching stubs are used between elements to maintain current in the proper
phase.
The gain of a collinear antenna is greatest when the elements are spaced
from 0.4 to 0.5 wavelengths apart or when the number of elements is
increased.
The optimum gain of a broadside array is obtained when the elements are
spaced 0.65 wavelengths apart.
A parasitic array consists of one or more parasitic elements with a driven
element. The amount of power gain and directivity depends on the lengths of
the parasitic elements and the spacing between them.
Figure 4-Sum 13. Parasitic Array
4-65
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