Patent ID: 9620862
Date: 2017-04-11
CPC Classifications: H01Q

Claim:
1. A reflectarray comprising: a plurality of elements arranged in a first axial direction and in a second axial direction that is perpendicular to the first axial direction, wherein the plurality of elements reflect an incident wave, and the reflectarray reflects the incident wave in a desired direction that is not included in a plane including the incident wave and a specular reflected wave, each of the plurality of elements is formed of a mushroom-like structure that includes at least a rectangular patch that is separated from a ground plate by a predetermined distance, the rectangular patch having a single layer structure, the ground plate having a single layer structure, the rectangular patch including a first edge along the first axial direction, and a second edge along the second axial direction, at least one of (i) a gap between the rectangular patches of the plurality of elements, (ii) a size of the rectangular patch, and a (iii) a distance between the elements, is set, the first edges of the plurality of rectangular patches arranged in the first axial direction having a common length, and the second edges of the plurality of rectangular patches having respective lengths that gradually vary along the first axial direction, so that a phase of a reflected wave by a specific element of the plurality of elements satisfies a first condition and a second condition, the first condition is such that the phase of the reflected wave by the specific element differs, by a predetermined value, from a phase of a reflected wave by an element adjacent to the specific element in the first axial direction, while the phase of the reflected wave by the specific element is equal to a phase of a reflected wave by an element adjacent to the specific element in the second axial direction, the second condition is such that an absolute value of a component in the second axial direction of an incident unit vector along a traveling direction of the incident wave is equal to an absolute value of a component in the second axial direction of a reflection unit vector along a traveling direction of the reflected wave, and while assuming that a position vector r