
DJI Mavic Mini Yagi antenna, NBS Note 688
thingiverse
This is remix of original antenna. Since I could not find any information on how the yagi was calculated I re-did yagi calculation based on the Nist Technical Note 688 found here https://tf.nist.gov/general/pdf/451.pdf Calculated for 5800 MHz. Page 7 design for 1.2 lambda plus diameter correction applied derived from graphs on page 9. For directors and reflector use1.3 mm wire which can be obtained from stripped AWG 16 household copper wire. Get a 1 ft cut in your local hardware store, costs few $$. The lengths are: Reflector: 24.57 mm First and last directors: 19.93 mm Two middle directors: 19.37 mm Spacing as per design is 0.25 lambda for directors and 0.2 for reflector (already set with the print) I found it easier to cut the wire using small wire cuter 1-1.5 mm longer then file ends to reach right size. Need to be within 0.15 mm as per technical note, I managed under 0.1mm I am still questioning applicability of this design since this is not a dipole or folded dipole antenna as required and have no way of measuring gain (Can not obtain RSSI data from the DJI app).
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