Patent ID: 11953588
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An underground radar device, comprising a transmission array antenna, and a reception array antenna, further comprising:
a position variable mechanism capable of changing intervals between antenna elements of the transmission array antenna and the reception array antenna while keeping all the intervals equal,
wherein the position variable mechanism comprises:
a drive unit capable of changing an interval between a first pivot and a second pivot that are vertically arranged;
a plurality of crossbars which have one ends thereof connected to the first pivot and the second pivot to form a V-shape and an inverted V-shape, in which the one ends are respectively connected to another end forming the V-shape and another end forming the inverted V-shape, and which constitute an expandable link expanding and contracting by changing inclination angles of the V-shape and the inverted V-shape in conformity with the interval; and
a plurality of link sections that couple intersection portions where the crossbars intersect, and two of the crossbars at each portion forming a bottom of the V-shape and a crest of the inverted V-shape so as to allow the inclination angles of the V-shape and the inverted V-shape to be changed, and
wherein the antenna elements are arranged at the respective link sections.