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Dipole_folded.php   6785 Bytes    08-04-2015 07:48:33

Folded Dipole Calculator

Dipole, folded

Frequency [MHz]


Length units

 mm  inch

Length A


Length Gap

Length B


Radius R

Length C


Rod Diameter

Length D


Total Length

The impedance of this antenna is around 300 Ω, so you may want to use a transformer or a λ/4 long piece of 120 Ω coaxial cable to match this impedance to 50 Ω. Geometriy is not that critical. If you want to put this thing outdoors, do not use brass, as it gets brittle.


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t1 = 3913 d

t2 = 372 ms

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