Cuming Microwave Model C Spherical Dielectric Radar Target

The Model C Radar Target is a spherical lens made of a filled plastic with a controlled dielectric constant gradient. It has a large radar cross section (RCS) over a large viewing angle and is broad banded in the microwave frequency range.

The Model C is inherently rugged and needs no radome. It is available in a range of diameters from 3 to 6 inches. Theoretical RCS is given in the table below; actual performance will be very close to theoretical. In many cases, measured RCS data can be provided. Some diameters other than those listed are available. 

The reflectivity pattern of the Model C depends on the size and shape of he reflective cap located at the focus of the lens. Type 90, Type 140, and Type 180 covering 90º, 140º, and 150º sperical viewing angles are available.

Typical Reflective Patterns of Model C-04 Targets at X—Band

The standard mounting of the Model C Radar Target is an aluminum ring mount, as shown in the sketch below. Model C can also be supplied as a sphere enclosed in a plastic radome, or in a variety of custom mounts. Units can be supplied with a threaded fiberglass mounting stud which projects from the sphere. Location of the stud will normally be directly out from the back end of the unit, i.e., centered in the reflector cap. Alternatively, the stud can project 90o around the sphere from the center of the reflector cap, permitting side, up, or down mounting.

An advantage of the Model C Radar Target is that its outer surface is hard, dense and rugged. The device is strong enough to be exposed to the airstream of a supersonic vehicle without a protective covering. Special aerospace rain erosion coatings can be applied, if required. 

Other kinds of radar targets are available from Cuming Microwave. Some are based on clusters of corner reflectors. When space is limited, folding “pop-up” reflectors can be supplied. Special lightweight units and both uniform and non-uniform dielectric lenses are also available. Interested parties are encouraged to consult our Engineering Department for advice.