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Last modified: Tue, 13 Jun 2017
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Realacc Pagoda-2


This is the version of my own Pagoda antenna which is sold by Banggood/Realacc. These units were sent to me by Banggood.

I measured one SMA and one RP-SMA unit. The soldering was a bit inconsistent, but the large difference between the two measurements is probably caused mostly by the imperfect SMA to RP-SMA adapter that I had to use to measure the second antenna.

Note that the PCB thickness is just 0.8mm instead of the specified 1.0mm, and I have seen quite a few units where the two top PCBs are not exactly parallel. This explains the shift in resonant frequency and may also affect the axial ratio.

I have no anechoic chamber measurements for these units, but I do have them for my own Pagoda-2 antenna, which should have a similar radiation pattern.

VNA measurements

Image: photo-realacc-pagoda2.jpg

RHCP version

Image: vna-realacc-pagoda2.png

SMA and RP-SMA versions (both RHCP). The matching is a bit off, it is perfect at 6 GHz but less impressive at 5.8 GHz, resulting in somewhat reduced efficiency.
However if you add your own heat shrink to these, it will probably shift the frequency back down a bit, so in that case it's actually fine.


Comments

Rpbaetens

Comment #1: Mon, 17 Jul 2017, 23:42 (GMT+1, DST)

Quote


Hi,

I just purchased a few of these from banggood and then found these measurements. You reference a heat sink that may help correct the center frequency. How would you go about such a thing?

-R

Edit: just re-read and saw you actually reference heat shrink, not sink. Never mind!

Last modified: Mon, 17 Jul 2017, 23:42 (GMT+1, DST)

Nepoxx

Comment #2: Mon, 11 Sep 2017, 16:52 (GMT+1, DST)

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Where do you put the heat shrink though? The banggood pagodas are shipped with a protective rubber on the 3 rings, that might be enough to shift the frequency down a bit?

Maarten Baert

Administrator

Comment #3: Sun, 29 Oct 2017, 2:42 (GMT+1, DST)

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Quote: Nepoxx

Where do you put the heat shrink though? The banggood pagodas are shipped with a protective rubber on the 3 rings, that might be enough to shift the frequency down a bit?

That could work, but I would try putting heat shrink around the entire thing to make it more robust.

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