In telecommunications, a collinear (or co-linear) antenna array is an array of dipole antennas mounted in such a manner that the corresponding elements of each antenna are parallel and collinear, that is they are located along a common line or axis.
A collinear array is usually mounted vertically, in order to increase overall gain and directivity in the horizontal direction. Theoretically, when stacking idealised lossless dipole antennas in such a fashion, doubling their number will, with proper phasing, produce double the gain, which an increase of 3.01 dB. In practice, the gain realised will be below this due to losses.
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
Chris Burks
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