The invention relates to a
dielectric-loaded based ultra
wide band compact field feed source. The ultra
wide band compact field feed source comprises an improved
dielectric-loaded
horn antenna (1), a supporting column (2), a
flange plate (3) and a wave-absorbing material (4), wherein a
ridge waveguide part is matched with a
ridge curve of a horn for increasing the thickness of a
ridge (5) to the maximum; two semi rigid
coaxial cable electric connectors connected by an
SMA connector are adopted as feed probes, and the
diameter of the cable is less than 2 mm; the two feed probes are perpendicularly mounted, and are corresponding to two polarities of the feed source respectively; the
radiation electric field of the feed source antenna can be concentrated to a
dielectric region as far as possible by optimizing the shape of the dielectric-loaded material and the relative position of a four-ridge
horn antenna for stabilizing the
phase center; the supporting column of a certain length is arranged behind the dielectric-loaded
horn antenna to enable the dielectric-loaded horn
antenna aperture to be far from a feed source bracket; the wave-absorbing material of a specific size is added at the bottom of the supporting column for restraining multiple times of
radiation caused by a complex
metal structure of the feed source bracket; and the dielectric-loaded based ultra
wide band compact field feed source has the outstanding advantages of small size,
light quality and low cost.