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Dvogonen

7 turn Helical FPV antenna (5.8 GHz)

by Dvogonen Mar 1, 2017
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Yes, aluminum is a good material for making antennas.
The only problem would be soldering to it.

Could you just place a sheet of aluminum foil over the reflector?

Hi there,
Where did you get your measurements from?
Your "former helix" has a 12mm diameter which is way too small in my opinion. For 5.8GHz a diameter of 16.5mm is needed, at least if we believe the online calculators.

The outside of the former is 15mm, not 12mm.
The circular diameter of the holder is somewhat larger. When the formed thread is threaded onto the holder it is forced to expand slightly to fit and will end up close to the target diameter of 16.5 mm.

I've seen other projects on thingyverse that have the same theory, but I'm really wondering what kind of material they are using.
I'm using pure oxygen free copper wire and this (almost) doesnt expand at all, so im stuck with a 12mm-13mm helix. I tried to widen it on the outside of the former to at least 15mm but now its kinda messy.
I guess I will do my own design to get the correct measurements

Edit: Ive also didn't see a single project that includes a wave trap.

Looks like the optimal reflector in the paper is the truncated cone, not the cylinder. Am I wrong?

No, you are absolutely right.
But a truncated cone is a bit harder to make and is rather big.

I've finally made one. Small version of the ground plane, printed disk and glued with copper tape on both sides, 1mm copper wire for the helical part. (See "Made", I uploaded a picture)
I compared it using a True-D diversity RX and a TBS Triumph sending antenna. (all right hand)

  1. Compared against pretty good 4 leaf cloverleaf antenna: 90% of the time the RX used the helical. Even when turned away from the sender.
  2. Compared against TBS patch antenna: 75% of the time still used the helical. They were both a bit off angle, so it depended a little bit on the rx angle, but even if the patch was pointed directly at the sender, the RX overall preferred the helical.

Note: I used pure copper wire and double shielded coax cable. Also the connector was crimped very good. But I assume, the other antennas are also not made out of shitty materials.

Also some kind of protective cover would be great to carry it in a backpack. Could you design something or publish the source files?

Awesome! Thank you very, very much for sharing this awesome antenna!

Where did you find the 2" copper circle blanks? Do they need to be circle?

I used double sided PCB board that I cut using a Dremel.
Cuper sheet would have been more convenient to use, but I had none at the time.
The reflector does not have to be round. If you use a square the sides should be the same length as the diameter of the circle.

This thing is awesome! What's the beam width on this guy?

What guage/size of copper wire do you recommend using with this?

As far as I understand the gauge of the wire has little influence on the reception. I used wire from an old transformer which I think is somewhere between 1 and 2 mm. Single strand electrical installation wire should also work.

So what kind of gain is expected with this build?

The peak gain is 13.9 dB

Disregard...read the .pdf infinite ground plane

Did you measure it? And how?

Did not measure, was going by the design expected/calculated gain...

What would one of these be used for, out of curiosity? It's a nice design.

Directional high gain antenna...have someone aim it at your quad flying around, and it boosts the received signal (for the goggles just by it's design...and 13dbi is a HUGE gain from something that probably costs less than $10

This design is intended mainly to be used for receiving analog video transmitted on the 5.8ghz band. The transmitter is typically mounted on a multirotor or in a plane.