6 turn helical antenna
thingiverse
I used a 41 mm hole saw to drill a precise hole in a single-sided FR4 PCB for my 6-turn helical antenna. The hole fit the RG402 cable snugly at its base. By stripping the shield and reducing the dielectric thickness of the last quarter of the cable, I achieved a feed gap of just .5mm or less. My homemade SWR meter measured an impressively low 1.02 SWR for this antenna. Designed to operate at 5705 MHz (or 5.705 GHz), I printed the antenna in .3mm layers with 20% infill using PLA. The antenna on the back left is identical, but both antennas are included in the attached SketchUp file.
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