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vhfuhfdirectionalcircular-polarization

Helical Antenna

Directional helix with circular polarization

Source: Rothammel, Vol. 2, Ch. 26.6, p. 155
Input Parameters
MHz
#
Results
Turn Circumference
0.690m
Helix Diameter
0.220m
Turn Spacing
0.172m
Total Axial Length
1.724m
Ground Plane Diameter
0.517m
Gain
14.8dBi
Half-Power Beamwidth
32.9°
Feed Impedance
140Ω
Diagram
Feed0.17 m⌀ 0.22 m1.72 m
Radiation Pattern
-3 dB-10 dB-20 dB0 dB0°90°180°270°Max: 12.2 dBiF/B: 15.2 dB