Patent ID: 11936123
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. An array antenna, comprising:
a substrate; and
a plurality of antenna elements having a flat plate shape, wherein
the substrate has
a first surface,
a second surface facing the first surface, and
a groove portion recessed toward a side of the second surface from the first surface,
the plurality of antenna elements are aligned and arranged along the first surface at equal intervals on the first surface or in a layer between the first surface and the second surface, and
under a condition λ is a wavelength of a radio wave in free space,
a distance between respective centers of two of the plurality of antenna elements adjacent to each other is equal to or greater than λ/2, and
a distance between a center of an antenna element, which is one of the plurality of antenna elements and is arranged at a position adjacent to the groove portion, and the groove portion is equal to or greater than λ/9 and equal to or less than half a distance between respective centers of two of the plurality of antenna elements adjacent to each other, wherein
the substrate further includes:
a ground terminal arranged on the second surface, and
a ground electrode and a via formed between the layer, in which the plurality of antenna elements are arranged, and the second surface, the ground electrode is connected to the ground terminal, and

at least a part of the ground electrode and the via is arranged in an outer region, the outer region being a region between the outer antenna element and the end surface.