| http://www.w3.org/ns/prov#value | - In the rectangular arrangementor the triangular arrangement, when the intervals of the element antennas (hereinafter referred to as element intervals") are widened in order to reduce the number of element antennas, the grating lobe having substantially the same level as that of themain lobe occurs, resulting in a problem such as the radiation in an unnecessary direction, or the like.
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