Is it possible to use a 360 degree omnidirectional patch?
And what are the limitations in using antennas? Will everything work correctly with such antennas?
Operating range 900 MHz
Most patches are typically have directionality, and don’t receive very well at all towards the horizon. Can I know what patch you are using?
I plan to use a patch of this type!
Quite a good factory antenna
TBH i’m not sure how well this patch would work, you’d need to test it empirically. I’m not sure how the 2x2 cross-polarized MIMO design would affect things.
One thing to think about with patches in a circular array is what the signal sees from the side. If it’s exactly orthogonal, the other patches could be blocked in terms of line of sight.
This is what the antenna looks like.
It is planned that the antennas will be located lower than the signal source. The signal source will be in the air in the form of a small meteorological balloon for conducting small experiments)
If the TX is in the air, then it should work. But do remember that if the elevation angle is too high, the array may stop working as a UCA array correctly.
Can you tell me how to make a correct UCA array?
With these antennas I don’t quite understand how to calculate the distance between the elements and the radius)
For radius and interelement spacing calculations it’s good to use the excel spreadsheet available at https://github.com/krakenrf/krakensdr_docs/raw/main/antenna_array/Antenna_Array_Size_Calculator.xlsx
Yes, I understand how to do this with standard antennas and I already work successfully.
But with these antennas from mocrotik, how can I calculate the array? The antennas do not look like a pin, so I do not understand where to calculate the distance from the center of the antenna or from the edge?
Maybe you can tell me?
You need to ask the manufacturer for simulations that show where the phase center of the antenna is. But if you can’t get this info, I think its fair to assume that it is in the center.