Principle

THE LUNEBERG LENS PRINCIPLE

The Luneberg lens is a dielectric sphere with a permittivity varying with the distance from the center. This property allows a good focalisation of the microwave beams in a focal point located at the peripheral of the lens. The lens can then be used as a reflector (with a metallization) or as emission or reception antenna (with one or more feeds).


THE ADVANTAGES OF A LUNEBERG REFLECTOR

Considerable increase in RCS (Radar Cross Section) for any systems with little or no RCS

Homogeneous response within a wide angle

THE ADVANTAGES OF A LUNEBERG ANTENNA

Reduced size
High reception performance/Extremely large bandwidth
Generation of multiple beams aimed in different directions / multi-beam antenna

APPLICATIONS

 

The Luneberg lens is used for two types of applications:

- reflector or passive radar reflector
– antenna

The electromagnetic and mechanical properties meet the needs of military and civilian applications.

• Military : radar detection of target

• Civilian :

– port and airport beaconing
– maritime and river beaconing
– aerial navigation assistance
– signaling of vehicles, ships, buoys and obstacles
– microwave communication


MICROWAVE PATH IN THE LUNEBERG LENSES

SHAPES :

  • SPHERICAL LENS

Spherical lens


Variation of permittivity


Path of a microwave in a spherical lens

Spherical antenna

Variation of permittivity

  • HEMISPHERICAL LENS

Hemispherical lens

Hemispherical antenna

Path of a microwave beam in a hemispherical lens

EXEMPLES


Drone

Target

Remote controlled target

Target

Maritime beaconing

Radar
calibration
 Novamarine