QuinStar
Technology’s QRC series Cassegrain reflector antennas are available in diameters
ranging from 0.5 to 4 feet (15.2 to 122 cm) for any frequency in the 18-220 GHz range.
They operate over a fairly wide frequency range which is limited only by the circular
waveguide bandwidth. Gain is determined by antenna diameter, frequency of operation and
feed illumination. These antennas are typically more efficient than the prime focus
antennas, as the feed line losses are eliminated and a better match is obtained.
The main reflector
is parabolic in shape and machined very accurately of either aluminum or a composite
material. The subreflector is optimally designed and adjusted for best performance. The
subreflector and support structure create minimal blockage and hence produce reasonably
low sidelobe levels, generally below 16 dB. |
The
feed horns are selected to produce optimal illumination for low sidelobes and high gain.
The interface to these antennas is a circular waveguide of suitable diameter for the
center frequency. However, an integral circular-to-rectangular waveguide transition is
available as well as a variety of other options, including a detachable
circular-to-rectangular transition, orthomode transducer (OMT), circular polarizer (fixed
or adjustable) and mountable bore-sighted telescope. Typical weight of these units is
around 15 lbs, depending on configuration.
QuinStar’s series QRC
Cassegrain reflector antennas are ideally suited for applications requiring relatively low
depth and good input match. However, Cassegrain antennas of diameters smaller than 12
inches (30 cm) are not recommended for frequencies below 30 GHz. |
