Patent ID: 9136608
Filing Date: 2015-09-15
Classification: H01Q

Abstract:
1. A slot array antenna comprising: a radiation waveguide having a first conductor plane in which a slot array is two-dimensionally arrayed, a second conductor plane in parallel to the first conductor plane, and side faces closing the first and second conductor planes, and having a slot array in the first conductor plane so that a space surrounded by the first and second conductor planes and the side faces is set to be a waveguide space; an introduction waveguide having a slot array for introducing electromagnetic waves into the waveguide space; and excitation means for exciting the electromagnetic waves in the introduction waveguide, characterized in that: each slot of the slot array formed in the introduction waveguide is provided at every ½ wavelength or integer multiple of ½ wavelength of the electromagnetic waves inside the introduction waveguide in the direction propagating the electromagnetic waves in the introduction waveguide, and electromagnetic waves of a high-order mode are excited in the radiation waveguide where a plurality of magnetic loops are arranged in the direction of propagating the electromagnetic waves in the introduction waveguide; the slot array formed in the first conductor plane of the radiation waveguide is formed such that primary wave polarizing planes of radiated electric fields are oriented to the same direction by coupling to the electromagnetic waves of the high-order mode, and polarized wave components perpendicular to the primary wave polarizing planes cancel out for each other; and joining portions are provided for joining the first conductor plane and the second conductor plane, the joining portions being located at positions corresponding to nodes of guide-wall currents determined by a mode of electromagnetic waves propagating in the radiation waveguide.