3 turn helix antenna 1.28 GHz for FPV
thingiverse
Here is my version of a 3 turn helix antenna designed specifically for my FPV setup. I chose two millimeter stainless steel welding rods as the coil, selecting them for their durability and high-quality performance. As for the reflector, I repurposed a stove burner cover - a material only twenty micrometers thick required some reinforcement, which you can see in the files provided. Note: This design produces a Right-Hand Circular Polarization (RHCP) holder; to create a Left-Hand Circular Polarization (LHCP), simply mirror this design. Due to the excessive hardness of the stainless steel rods, I found them difficult to solder. Therefore, I decided to use two millimeter galvanized steel wire instead - its pliability and lower melting point made it much easier to work with. In an effort to make my antenna even more functional, I've included some specialized tools designed for rolling out a smooth helix structure; these tools are geared towards creating a Left-Hand Circular Polarization (LHCP) configuration. For those who require a Right-Hand Circular Polarization (RHCP), I encourage you to simply mirror the design. Here's a rundown of how I created this unique antenna system: Using data generated by the helix calculator found at jcoppens.com/ant/helix/calc.en.php, I was able to accurately model and calculate every dimension required for creating the perfect helix coil. Subsequently, using Fusion 360, I made precision cuts in a custom-designed holder which flawlessly aligns with two millimeter diameter wires.
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