I am installing a Cisco 1572e ap with 4 AIR-ANT2568VG-N. The customer wants the ap to be concealed so I plan on putting the ap above the ceiling and running the antennas below. My question is what the best or recommend distance between the antennas. I looking at installing all 4 in a metal access panel door in a square pattern.
Not an expert on the subject, but I remember reading somewhere that Antennas must be an integer number of wavelengths apart from each other.
Wavelenght is 12,5 cm for 2,4 GHz, and 6 cm for 5 GHz
So, 802.11b/g/n antennas may be 12,5 or 25 cm apart (or more, but the number must be x12,5)
802.11a/n antennas may be 6 or 12 or 18 or 24 cm apart (or more, but again, must divide by 6 clean)
It shouldn't matter how far are 2,4GHz antennas from 5GHz antennas, so yes, you can place them on a square something. I wouldn't put them too close together though, as there might be some electricity/magnetism/etc crosstalk.
There's something I overlooked, you have an outdoor AP. The recommended distances above are for mitigating Multipath effects. basically irrelevant in outdoor environments. Maybe you could dismiss these recommendations altogether and place your antennas as you wish.
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