Patent ID: 9509057
Filing Date: 2016-11-29
CPC Classification: H01P,H01Q

Claim Text:
1. An antenna comprising: a dielectric substrate; an antenna conductor on a front surface of the dielectric substrate, the antenna conductor being a comb-line antenna conductor including a power feed line and stubs; a ground conductor on a back surface of the dielectric substrate, the ground conductor including an opening in a region facing an input end of the power feed line; a waveguide tube joined to the back surface of the dielectric substrate, the waveguide tube having (i) a tube axis orthogonal to the back surface of the dielectric substrate and (ii) a tube wall whose edge surface surrounds the opening; a shield on the front surface of the dielectric substrate, the shield having a cut into which the input end of the power feed line is inserted; and short-circuit portions each short-circuiting the ground conductor and the shield, the short-circuit portions each penetrating the dielectric substrate, the short-circuit portions being provided along a whole periphery of the shield except for a portion provided with the cut, the cut having a reverse-taper shape whose width becomes greater from an open end of the cut to an inward end of the cut, wherein: each of the stubs extends in a direction orthogonal to the power feed line; and each of the stubs is provided, at a root, with a slit extending in a direction from an output-end side of the power feed line toward an input-end side of the power feed line.