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vhfuhfdirectionalcircular-polarizationhelix

Double Helix

Double helical antenna with circular polarization

Source: Rothammel, Vol. 2, Ch. 26.7, p. 160
Input Parameters
MHz
#
Results
Turn Diameter
0.2195m
Turn Spacing (λ/4)
0.1724m
Total Axial Length
1.724m
Ground Plane Diameter
0.517m
Gain
12.0dBi
Feed Impedance
140Ω
Diagram
Feed0.17 m⌀ 0.00 m1.72 m
Radiation Pattern
-3 dB-10 dB-20 dB0 dB0°90°180°270°Max: 12.1 dBiF/B: 15.2 dB