High field programmable transponder system and method

摘要

A transponder is programmed with an identification code or other information through a write antenna (6) that is smaller in size and has fewer turns than the convention read antenna (22, 24) used for later reading out the programmed information. An RF field that is much stronger than the field normally encountered by the transponder must be used to write information into the transponder. This effectively prevents inadvertent programming of the transponder memory (32) by a read field or electrostatic discharges, and eliminates the need for a special access code and associated circuitry that would otherwise be required for RF programming. <IMAGE>