Abstract: An operation mode switching module for a switching a near-field communication device between a sleep mode and a communication mode is provided. The operation mode switching module includes a driver, a detector, and a state machine. The driver drives a resonant circuit to generate an oscillation signal. The detector detects a level of effect of the environment upon the oscillation signal. The state machine determines whether to switch the near-field communication device from the sleep mode to the communication mode according to the level of effect of the environment upon the oscillation signal.

Abstract: An operation mode switching module for a switching a near-field communication device between a sleep mode and a communication mode is provided. The operation mode switching module includes a driver, a detector, and a state machine. The driver drives a resonant circuit to generate an oscillation signal. The detector detects a level of effect of the environment upon the oscillation signal. The state machine determines whether to switch the near-field communication device from the sleep mode to the communication mode according to the level of effect of the environment upon the oscillation signal.

Abstract: An automatic lock and automatic unlock method for a computer system and the associated computer system are provided. The method includes steps of detecting whether a user is in a predetermined range when a computer system is in an unlock status and recording a duration during which the user is not in the predetermined range, controlling the computer system to enter a lock status when the duration is greater than a predetermined time, determining whether the user has an effective authority when the computer system is in the lock status and the user is detected in the predetermined range, and controlling the computer system to enter the unlock status when the user has the effective authority.

Abstract: An automatic lock and automatic unlock method for a computer system and the associated computer system are provided. The method includes steps of detecting whether a user is in a predetermined range when a computer system is in an unlock status and recording a duration during which the user is not in the predetermined range, controlling the computer system to enter a lock status when the duration is greater than a predetermined time, determining whether the user has an effective authority when the computer system is in the lock status and the user is detected in the predetermined range, and controlling the computer system to enter the unlock status when the user has the effective authority.

Abstract: A high-directional wide-bandwidth antenna is disclosed. The high-directional wide-bandwidth antenna includes a first element, a first radiating body, a second radiating body, a third radiating body, and a fourth radiating body. The first element has a first feeding point, wherein its equivalent reactance is inductive. One end of the first radiating body is connected to the first element and the other end of the first radiating body is a coupling surface. The second radiating body has a second feeding point and is extended through the second feeding point to the coupling surface so that the energy is transferred between the first radiating body and the second radiating body through the coupling surface. The first resonant frequency is attained by the first radiating body and the second radiating body, and the second resonant frequency is attained by the third radiating body and the fourth radiating body.

Abstract: A RFID certified document preparing method includes the steps of: (1) providing a medium and printing an antenna on the medium, (2) printing document data on the medium, and (3) electrically connecting a chip to the antenna via a pad. The invention also provides a RFID certified document prepared according to this method.

Abstract: A RFID packaging material packaging method includes the steps of: providing a substrate having a conductive layer covered thereon, processing the conductive layer of the substrate to form an antenna, electrically connecting a chip to the antenna via a pad, and covering the substrate onto a product for enabling the product to provide a RFID recognition function. The invention relates also to the RFID packaging material made subject to this RFID packaging material packaging method.

Abstract: A high-directional wide-bandwidth antenna is disclosed. The high-directional wide-bandwidth antenna includes a first element, a first radiating body, a second radiating body, a third radiating body, and a fourth radiating body. The first element has a first feeding point, wherein its equivalent reactance is inductive. One end of the first radiating body is connected to the first element and the other end of the first radiating body is a coupling surface. The second radiating body has a second feeding point and is extended through the second feeding point to the coupling surface so that the energy is transferred between the first radiating body and the second radiating body through the coupling surface. The first resonant frequency is attained by the first radiating body and the second radiating body, and the second resonant frequency is attained by the third radiating body and the fourth radiating body.

Abstract: A radio frequency identification (RFID) device comprising a transmitter on a first surface of a substrate, a receiver on the first surface of the substrate, a ground area on a second surface of the substrate, a first antenna on the first surface of the substrate, the first antenna being electrically connected to the ground area and capable of transmitting outgoing signals, and a second antenna on the first surface of the substrate, the second antenna being electrically connected to the ground area and capable of receiving incoming signals.