The four elements are fed with the appropriate phase. Their tilt distributes energy between the horizon and higher elevations.
Antennas · F1SYH
Lindenblad antenna
The Lindenblad uses four tilted dipoles around a vertical axis to produce circular polarization and broad coverage.
VHF
UHF
Satellites
Operating principle
Main characteristics
Typical gain
Faible à modéré
Impedance
Réseau de division nécessaire
Polarization
Circulaire
Difficulty
Avancée
Dimensions and design
Each dipole is close to half a wavelength. Tilt angle, array diameter and feed network affect the pattern.
Construction and tuning
Step 1
Build four identical dipoles.
Step 2
Space them every 90 degrees.
Step 3
Respect the tilt angle.
Step 4
Build a phased divider.
Step 5
Use identical cable lengths.
Step 6
Verify final polarization.
Advantages
- Good general coverage.
- Circular polarization.
- Suitable for satellites.
- No rotor required.
Limitations
- Four elements and many connections.
- Complex phasing network.
- Moderate gain.
- Bulky mechanical structure.
History and origin
Nils Lindenblad developed this type of array during the 1940s for omnidirectional circular polarization.
Safety
Inspect cables, splitters and mounting points regularly.