Mesthastic Lora Jpole Antenna
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Jpole Antenna with radome
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This is the creation of a support for a Jpole antenna that can be used for the 868MHz ISM band.
The particular case is to be inserted into a 20mm electrical conduit. Given the dimensions, the effect of such a small conduit will require a slight shortening of the antenna during calibration. The difference in resonance will be noticeable when observing with and without the cover.
References for the measurements are widely available online by searching for Jpole.
I have attached some photos of the MeshTastic station currently in a temporary position using this support.
The support is fully customisable for wire and coaxial cable measurements. Pay close attention to the dimensions of the groove where the solder will be placed for impedance matching.
The cap is made of TPU for better elasticity, while the rest is made of PETG, which guarantees greater durability when exposed to the elements compared to PLA.
Down here you can find an example of lenght calculation, remember that in radom antenna have to be shortned or calculated with a velocity factor at about 0.85 instead of 0.96.
https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/