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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

The Three L-Antennas

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ANTENTOP- 01- 2017, # 021

The Three L-Antennas

 

 

Figure 6

 SWR and Gain at Wide OCF Dipole when Lower Arm is Swung Upwards

 

 

Model Example (Figure 7)

 

Conditions: 4NEC2 software model (Reference 10) of a Wide-L Antenna, fed at ½ wavelength over ground using #14 wire, optimized for 90 at 28.4 MHz are:

Predicted dimensions: Vertical arm: 2.083 meters tall; Horizontal arm: 3.1596 meters long.

Total length: 5.243 meters at 60-40 ratio.

Impedance: 49.3j0.12; SWR: 1.01; Gain: 5.88 dBi.

 

Below is the 3D view and horizontal/vertical polar graph produced by the model.

  • Like a dipole, the Wide-L antenna is directional to the side of the horizontal arm.

 

  • The radiation pattern differs slightly from an ordinary dipole because there is no dip on one side of the horizontal (red line) radiation pattern.

 

  • The Tall and Wide optimized models have similar dimensions for the short and long arms. A Tall-L antenna basically becomes a Wide-L Antenna when laid on its side.

 

Figure 7

 Wide L-Dipole

 

 

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Last Updated:

February 24, 2018 22:51

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