RADAR APPARATUS

摘要

A radar apparatus of the present invention includes: an antenna member including first-type and second-type horns different in distance from base portions to apertures of the horns; a feed unit including a plurality of waveguides each having one end connected to the respective base portions of the first-type horns and second-type horns; a radio frequency circuit; an information-processing circuit; and a signal line.;In addition, the waveguides connected to the respective base portions of the first-type horns are open on different receiving ends on the radio frequency circuit at the other end of each waveguide, whereas the waveguides connected to the respective base portions of the second-type horns are open on transmitting ends on the radio frequency circuit at the other end of each waveguide. Yet additionally, at least part of the feed unit is positioned more forward than the base portions of the second-type horns. Consequently, it is possible to downsize the radar apparatus.

主权项

1. A radar apparatus comprising:
an antenna member including a first-type horn and at least one second-type horn that are pyramidal horns each having an aperture and a base portion, the aperture of the first-type horn having a height greater than a width thereof, a length from a base portion to an aperture of the first-type horn being a first-type length, a length from a base portion to an aperture of the at least one second-type horn being a second length and greater than the first-type length; a feed unit including a plurality of waveguides each having one end connected to the respective base portions of the first-type horn and the at least one second-type horn; a radio frequency circuit in contact with the feed unit; an information-processing circuit; and a signal line connecting the radio frequency circuit and the information-processing circuit; wherein at least three first-type horns are present in the antenna member; the waveguides connected to the respective base portions of the first-type horns are open on different receiving ends on the radio frequency circuit at another end of each waveguide; the first-type horns and the at least one second-type horn are directed generally a same direction which is defined to be a forward direction; the at least three first-type horns line up side by side in a width direction thereof to form a row in the width direction; at least one of the at least one second-type horn is positioned at a leftmost or rightmost end of the row of the first-type horns; the waveguide connected to the base portion of the at least one second-type horn is open on a transmitting end on the radio frequency circuit at another end of the waveguide; a positional difference between the apertures of the first-type horns and the at least one second-type horn in a longitudinal direction of the antenna member is smaller than a free space wavelength of a radio frequency electromagnetic wave output by the radio frequency circuit; the base portion of the at least one second-type horn is positioned more backward than the base portions of the first-type horns by as much as a distance greater than the free space wavelength of the radio frequency wave output by the radio frequency circuit; and at least part of the feed unit is positioned more forward than the base portion of the at least one second-type horn.