Identification sensor for works buried at great depth

Abstract

A transponder for a RFID-type wireless communication and contactless identification system configured to be affixed to (or close to) structure intended to be buried, said transponder comprising: a set of antenna segments consisting of electrical wires constituting at least a first and a second antenna element (203-1, 203-2), a circuit board comprising a RFID chip and at least one tuning capacitance (202x) as well as coupling means (281) allowing the electrical coupling of said antenna segments; characterized in that said antenna segments are arranged close to each other, at a distance of less than 3 mm and preferably less than 1 mm, so as to allow the appearance of coupling capacities (280) capable of widening the band of tolerance on the RFID resonance frequency.

Dependencies are inferred from the claim text.