Patent ID: 8421697
Filing Date: 2013-04-16
Classification: H01Q

Abstract:
1. An antenna device, comprising: a waveguide having a rectangular cross-section and formed with a plurality of slots in at least one side face thereof, the plurality of slots being arranged in a tube axis direction; wherein at least one of the plurality of slots is formed with a predetermined inclination angle from a plane perpendicular to a tube axis direction of the waveguide, wherein at least one pitch between adjacent slots in the tube axis direction differs from pitches of other adjacent slots, and wherein the pitches between adjacent slots in the tube axis direction differ from the pitches of other adjacent slots on both sides of the waveguide in the tube axis direction with respect to the center of the waveguide in the tube axis direction, wherein a beam of an electromagnetic wave discharged from the slots is formed by uniting beams of aperture distributions having a plurality of side lobe levels different from each other, and a phase distribution of the slots is nonlinear in the tube axis direction.