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hfdirectionalbeamloop

3-Element Quad

Three-element cubical quad beam

Source: Rothammel, Vol. 1, Ch. 15.4, p. 263
Input Parameters
MHz
Results
Reflector Perimeter
22.261m
Driven Element Perimeter
21.625m
Director Perimeter
20.989m
Reflector Side
5.565m
Driven Element Side
5.406m
Director Side
5.247m
Reflector–Driven Spacing
4.240m
Driven–Director Spacing
3.180m
Boom Length
7.420m
Gain
8.5dBd
Front-to-Back
25dB
Feed Impedance (gamma match)
50Ω
Diagram
R5.57 mDE5.41 mD5.25 mboom: 7.42 m
Radiation Pattern
-3 dB-10 dB-20 dB0 dB0°90°180°270°Max: 9.4 dBiF/B: 24.8 dB