4x4 Mimo Setup

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gscheb
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4x4 Mimo Setup

Post by gscheb » Mon Jul 27, 2020 11:42 am

Hello,
Got some questions about 4x4 Mimo set up.
The first question is about antenna polarity. Done plenty of 2x2 Mimo antenna understand they need to 90 degrees apart. But when you are dealing with 4 of them can it be the same pattern twice like the picture shows below.
4x4 Mimo.PNG
4x4 Mimo.PNG (4.43 KiB) Viewed 281 times
OR do all four antenna have to be polarized to each of them in different quadrants?

The second question is could each of these be pointed to different towers? Or does 4x4 Mimo have to come from the same tower?

Viper67857
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Re: 4x4 Mimo Setup

Post by Viper67857 » Mon Jul 27, 2020 12:21 pm

My assumption is that it would work best with one vertical, one horizontal, and the other 2 at +-45, and definitely all pointed at the same tower. From my limited understanding, all the different polarizations aren't a mandatory thing, it just helps to isolate the signals from each other without the need for as much physical separation..

gscheb
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Re: 4x4 Mimo Setup

Post by gscheb » Mon Jul 27, 2020 1:55 pm

Think you are talking about this.
4x4 Mimo 2.PNG
4x4 Mimo 2.PNG (7.21 KiB) Viewed 268 times
So the two sets are actually 45 degrees are apart not 90 degrees.

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Re: 4x4 Mimo Setup

Post by Viper67857 » Mon Jul 27, 2020 2:21 pm

I was thinking more of 2 flat panel or parabolic 2x2 mimo antennas with one upright and one tilted 45deg, so a + and an x... With 4 single antennas it would be more like | - / \

gscheb
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Re: 4x4 Mimo Setup

Post by gscheb » Mon Jul 27, 2020 10:27 pm

Viper67857 wrote:
Mon Jul 27, 2020 2:21 pm
I was thinking more of 2 flat panel or parabolic 2x2 mimo antennas with one upright and one tilted 45deg, so a + and an x... With 4 single antennas it would be more like | - / \
I was talking flat panel or parabolic too. Just trying to define the planes of each single antenna within the two mimo set ups put together.
Even so with your single antennas put together you end up with 45 degrees between the two mimo set ups.

Viper67857
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Re: 4x4 Mimo Setup

Post by Viper67857 » Tue Jul 28, 2020 8:18 am

Ah, okay... Ant4 is out of position, then... It's on the same plane as 3 in the drawing.

gscheb
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Re: 4x4 Mimo Setup

Post by gscheb » Tue Jul 28, 2020 8:32 am

Yes that is right was just working on fixing it.
4x4 Mimo 3.PNG
4x4 Mimo 3.PNG (10.43 KiB) Viewed 239 times

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