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Dipole_straight.php    6816 Bytes    19-06-2024 16:45:29


Straight Dipole Calculator


To be combined with a Yagi Uda Antenna or used as is.




Dipole, straight




Frequency [MHz]

 

Length units

 mm 

Diameter D

 

Length A

Half Wavelength

 

Reduction




The impedance of this antenna is around 50 Ω, so you may want to use a 1 : 1 transformer. Geometry is not that critical. If you want to put this thing outdoors, do not use brass, as it gets brittle.




✈ Verify the Calculations / Results




As with any calculator, we double cross-checked the results. For that, a small pcb was designed. It allows for easy soldering of the rods in a well-defined geometry. As a transformer, we used a ETC1-1-13TR (1:1, 5 MHz - 3 GHz). The rods are made of copper, diameter = 3 mm.


Dipole Adapter in Action


L = 78 mm, F = 820 MHz (Gap = 10 mm)
L = 84 mm, F = 763 MHz (Gap = 10 mm)


It can be seen, that the calculated length's are approx. 5% longer than necessary. We call this tuning-reserve.




✈ Share your thoughts



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Your Browser says that you allow tracking. Mayst we suggest that you check that DNT thing ?

 
t1 = 6584 d

t2 = 181 ms

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