Realacc Pagoda-2
Last updated 13 June 2017
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
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
This page used to have a comment section. It's closed now; what remains are the questions I answered.
Nepoxx · 11 September 2017, 16:52
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 author · 29 October 2017, 02:42
That could work, but I would try putting heat shrink around the entire thing to make it more robust.
Nightsurfer · 14 August 2020, 19:04
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 Grammer.
Julian at G1EKW <TakeThisOut> dot Radio
Maarten Baert author · 14 August 2020, 22:02
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.