| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress, in an antenna unit, the deterioration of conversion efficiency of transmission power transmitted between a waveguide and a planar line through a resonant element, when a normal direction orthogonal to the surface of a dielectric substrate intersects with the tube axis direction of the waveguide.SOLUTION: The antenna unit includes: a waveguide 32 which propagates a radio wave through a tube axis direction J; and the dielectric substrate which blocks the waveguide 32. The tube axis direction J intersects with a normal direction K orthogonal to the surface of the dielectric substrate. A resonant element 51 is provided on the rear face of the dielectric substrate. The resonant element 51 is of a trapezoid, in which a first bottom side B1 located on the front side is long and a second bottom side B2 located on the rear side is short, when viewed from the normal direction K.</p> |
