Hyperboloid Lens Antenna with a Cylindrical Waveguide Feeder

Lenses are used to collimate incident energy to prevent it from spreading in undesired directions. Hyperboloid lenses are used in radar systems and communication multibeam systems.
The hyperboloid lens used in this example is of convex plane type. That means that one side of lens is hyperboloid, while the other side (toward radiation direction) is a planar.
Waveguide used in this project is specially designed to suppress back radiation. That was done by adding a choke to horn aperture edge. Length of choke is equal to quarter of free-space wavelength.
This kind of waveguide is used in satellite systems, radar application, etc. It is usually used as a feeder for a reflector-type or lens-type antenna system ... read more

Luneberg Lens Antenna Illuminated by Corrugated Horn

Lenses are used to collimate incident energy to prevent it from spreading in undesired directions.
Luneberg lenses are broadband. These kinds of lenses are usually used in microwave frequencies. They are used in antenna constructions, radar calibrations, satellite systems and they are expected to be used in future in some of the internet communication systems.
Corrugated horn antennas are a type of horn antennas developed for achieving high efficiency. Horn antennas are used in satellite systems, radar applications, etc. and are the main type of feeders of reflector and lens antennas. Luneberg lens is a spherically symmetric structure with variable refracting index, decreases radially out from the center. Luneberg lens creates two conjugate foci outside of the lens ... read more