WATCHING METHOD, WATCHING SYSTEM IMPLEMENTING THE SAME, AND PORTABLE COMMUNICATION APPARATUS INCLUDING THE WATCHING SYSTEM

摘要

A monitoring method, a monitoring system employing the monitoring method, and a personal digital assistant with the monitoring system are provided to easily monitor a target area in real time by using an electric signal. A monitoring system includes at least one RFID(Radio Frequency Identification) tag(10), at least one reader(20), and a determination unit(30). The RFID tag is located corresponding to a to-be-monitored region. The reader transmits/receives an electric signal to/from the RFID tag. The determination unit is electrically connected with the reader and senses the sensitivity of an electric signal received from the reader to determine whether the to-be-monitored region is abnormal. The reader includes a directional antenna.