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
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RHCP version |
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. |
Comments
Rpbaetens |
Comment #1: Mon, 17 Jul 2017, 23:42 (GMT+1, DST) 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) 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 BaertAdministrator |
Comment #3: Sun, 29 Oct 2017, 2:42 (GMT+1, DST) 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. |
Nightsurfer |
Comment #4: Fri, 14 Aug 2020, 19:04 (GMT+1, DST) Hi, I see on the Banggood website they claim 5dBi gain. Having read your analysis of your original design, and having designed many experimental antennae myself, I am dubious, especially as you only claim 1dBi for the original design. So I was wondering whether you have had a chance to check their claims? https://uk.banggood.com/Realacc-Pagoda-Antenna-RHCP-Right-Angle-5_8G-5dBi-50W-75mm-Omni-FPV-Antenna-SMA-or-RP-SMA-For-RC-Drone-p-1219943.html?rmmds=detail-top-buytogether-auto&ID=513344511532&cur_warehouse=CN Regards, Julian at G1EKW <TakeThisOut> dot Radio Last modified: Fri, 14 Aug 2020, 19:39 (GMT+1, DST) |
Maarten BaertAdministrator |
Comment #5: Fri, 14 Aug 2020, 22:02 (GMT+1, DST) Quote: Nightsurfer
Hi, I see on the Banggood website they claim 5dBi gain. Having read your analysis of your original design, and having designed many experimental antennae myself, I am dubious, especially as you only claim 1dBi for the original design. So I was wondering whether you have had a chance to check their claims? https://uk.banggood.com/Realacc-Pagoda-Antenna-RHCP-Right-Angle-5_8G-5dBi-50W-75mm-Omni-FPV-Antenna-SMA-or-RP-SMA-For-RC-Drone-p-1219943.html?rmmds=detail-top-buytogether-auto&ID=513344511532&cur_warehouse=CN Regards, Julian at G1EKW <TakeThisOut> dot Radio Banggood claims all kind of things, I would take their specs with a grain of salt. The actual gain is most likely comparable to other Pagoda-based designs. I also have no idea where they got that 50W spec from. Last modified: Fri, 14 Aug 2020, 22:03 (GMT+1, DST) |