TAMPER INDICATING SAW TAG SYSTEM AND METHOD FOR USING SAME

摘要

Embodiments of the invention provide a tamper indicating system using surface acoustical wave tag devices. This is achieved by the use of at least two surface acoustical wave tag devices. In one embodiment, a first surface acoustical wave tag device (820) returns an identification signal in response to an interrogation and a second surface acoustical wave tag devices returns an indication of tampering (840) in response to an interrogation. An antenna assembly is provided comprising conducting elements each of which are deformed to form a partial helix. One element is spiraled in an opposite direction from the other and wherein the elements are arranged opposite each other in the form of a partial double helix.