
509Chapter twenty-four: Using Six Sigma to evaluate using automated inventory tracking
interface. How do RFID systems work? The antenna of the interrogator (reader) emits radio
signals, where the electromagnetic (EM) eld transmitted can be continuous. This signal
is received with an antenna that comes in a variety of shapes and sizes. The antenna can
be built-in or external, and circular polarization of reader antenna allows any tag versa-
tile antenna orientation. A sample range for these antennas is anywhere 1 inch to >100
feet. Transponders (tags) respond with their unique code, contain a microchip and/or inte-
grated circuit, antenna made ...