Low-probability of intercept of ultra-low-power, near-field signals

Long considered a technical backwater, low-power, near-field systems are emerging as the preferred solution for a variety of useful applications. These applications include short-range communication, radio frequency identification (RFID), and real-time locating systems (RTLS). This paper explores the ultra-low-power and thus low-probability of intercept nature of near-field signals operating within the AM broadcast band under part 15 constraints.