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Offset paraboloidal reflector antenna for millimeter-wave radar
Technical Paper
2000-05-0378
Sector:
Language:
English
Abstract
Vehicular collision avoidance radar systems using
millimeter-wave have been developed in recent years. Because of
their simple structures, a microstrip antenna or a lens antenna is
often used as the radar antenna. However, the antenna efficiencies
of these antennas are low, in general. Therefore, the types of
antenna that have small antenna aperture are difficult to obtain
high antenna gains. In addition, it is difficult to radiate many
beams at narrow beam intervals with a lens antenna.
We developed an offset paraboloidal reflector antenna (the OP
antenna) for the vehicular collision avoidance radar. This antenna
consists of one pyramidal horn antenna and one offset paraboloidal
reflector. They pyramidal horn and the radio frequency unit (the RF
unit) of the radar are fixed in the radar head. To scan the beam,
only the reflector is rotated. Using a reflector-rotating
mechanism, the OP antenna can radiate many beams toward different
directions. Therefore, it is easy for the OP antenna to increase
the number of beams and to extend the target detection angle range.
We have improved the OP antenna in order to extend the target
detection angle range and to miniaturize the radar head. The OP
antenna was designed to radiate four beams so that the target
detection angle range might become 12 degrees.
We have produced the OP antenna and measured its
characteristics. For each four beams, the antenna gain of 28 dBi
and the antenna efficiency of 63% are obtained. Both measured
results of the radiation patterns and the antenna gains are almost
corresponding to the calculated results. Consequently, it was
confirmed that the OP antenna is useful for vehicular collision
avoidance radar systems. The radar system using the OP antenna is
now in the experimental stage on vehicle to verify and improve the
radar performances.
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