Patent ID: 11921175
Assignee: CANON MEDICAL SYSTEMS CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. An arrayed structure, comprising:
a cylindrical-shaped conductor layer; and
a cylindrical-shaped layer stack arranged on an inner periphery of the conductor layer and in which a plurality of frequency selective surfaces are arranged in layers and stacked, each of the frequency selective surfaces having a plurality of elements that are periodically arranged, wherein
each element of the plurality of elements is formed in such a manner that at least a portion of an edge of a particular element that faces an adjacent element in a same layer is closer to a center of the particular element than another portion of the edge, and
each element is a ring-shaped conductor, and is formed in such a manner that an edge that is parallel to a circumferential direction is offset toward the center of the element, and a width of the edge is greater than a width of a side that is orthogonal to the circumferential direction.