The lobes of both long wires combine along the V bisector. Directivity depends on electrical length and included angle.
Antennas · F1SYH
V-Beam antenna
A V-Beam consists of two long wires forming an open V toward the desired radiation direction.
HF
Directive
Longs fils
Operating principle
Main characteristics
Typical gain
Variable selon longueur et angle
Impedance
Élevée
Polarization
Mixte à horizontale
Difficulty
Avancée
Dimensions and design
Each leg is generally one or more wavelengths long. V angle is optimized for frequency and wire length.
Construction and tuning
Step 1
Choose the main direction.
Step 2
Calculate both leg lengths.
Step 3
Determine the included angle.
Step 4
Install three supports.
Step 5
Feed with balanced line.
Step 6
Add termination for a travelling-wave version.
Advantages
- Directional gain.
- Only three supports.
- All-wire construction.
- Broadband operation possible with termination.
Limitations
- Large area required.
- Frequency-dependent pattern.
- High impedance.
- Fixed direction.
History and origin
V-Beam antennas were used as simpler directional alternatives to large Rhombic arrays.
Safety
Long wires must be high enough and securely supported.