BATTERYLESS, PORTABLE, FREQUENCY DIVIDER

摘要

A barteryless, portable, frequency divider including a first LC circuit (L1, C1) that is resonant at a first frequency for detecting electromagnetic radiation at the first frequency; a second LC circuit (L2, C2) that is resonant at a second frequency that is one-half the first frequency; and a transistor (Q1) coupling the first and second LC circuits for causing the second LC circuit to transmit electromagnetic radiation at the second frequency.
The first and second LC circuits respectively include inductance coils that are positioned orthogonally to one another so as not to be mutually coupled. The frequency divider is operable solely from tne energy of the electromagnetic radiation detected by the first LC circuit. The frequency divider is useful as an electronic tag for attachment to articles for enabling detection thereof when moved through a surveillance zone containing electromagnetic radiation at the first frequency and thereby is useful in shoplifting detection systems.