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hfdipoleshortenedloading-coilcompact

Shortened Dipole

Dipole with loading coils

Source: Rothammel, Vol. 1, Ch. 10.4, p. 192-194
Input Parameters
MHz
m
mm
Results
Shortened Dipole Length
7.00m
Each Arm
3.50m
Full Dipole (no shortening)
10.03m
Shortening
30.2%
Required Inductive Reactance (per coil)
37.5Ω
Loading Coil Inductance
421.57µH
Coil Turns (approx, D=25mm)
87
Diagram
50 Ω3.50 m3.50 m7.00 m
Radiation Pattern
-3 dB-10 dB-20 dB0 dB0°90°180°270°Max: 2.1 dBi