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In order to obtain greater gain, yagi antennas may be arranged in arrays and fed in-phase by means of a power divider.
The arrays may be stacked vertically, side by side in bays, or a combination to provide the desired gain and pattern of radiation.
Polarisation may be vertical or horizontal. | | | |
Electrical characteristics remain the same as for a single yagi antenna, except for the gain and radiation pattern.
The arrays may be made up of yagis having from 3 to 15 elements, depending on the frequency band, requirement for gain, and mounting restraints.
The antennas may be end or centre mounted.
Heavy duty fibreglass bracing and stacking kits to suit various configurations as well as a range of power dividers and mounting clamps are available to order. | | | |
SPACING OF THE YAGI ARRAYS
Measured between the centers of the antenna booms, the antenna spacing varies depending on the number of yagi elements:
Number of elements = ratio
3 = 320
4 = 340
6 = 420
9 = 510
15 = 600
To calculate the spacing in meters, use the formula:
spacing (meters) = ratio/ Frequency (MHz)
eg. 6 elements @ 450 MHz = 0.933m
eg. 9 elements @ 860 MHz = 0.593m | | |
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| MODEL NO |
4 Stack 2 Bay Vertical |
| FREQUENCY |
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| GAIN |
21dBd |
| BEAMWIDTH E |
9° |
| BEAMWIDTH H |
23° |
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