| 摘要 |
<p>A resonant tag (58) used with an electronic article surveillance system for detecting the tag within a surveilled area utilizing electromagnetic energy at a predetermined detection frequency includes a resonant circuit (66, 68) capable of resonating at the predetermined detection frequency. The resonant circuit (66, 68) includes an inductor (66) formed at least in part on a surface of a dielectric substrate of the tag (58). The inductor (66) is formed with a discontinuity or gap (74) causing an electrical open circuit. The open circuit is closed with a fuse (36) secured proximate to the gap (74) and wirebonded (40, 42) to the portions of the inductor (66) proximate to the gap (74). The fuse (36) is melted by a current greater than a predetermined level flowing therethrough. Such a high current may be induced in the inductor (66) by an external electromagnetic field. Melting of the fuse (36) causes an open circuit condition, which alters the frequency at which the tag (58) resonates.</p> |
