摘要:
A method for compensating the axial ratio of an antenna for testing radio-frequency identification (RFID) tags and an apparatus using the method are provided. The method includes the following steps. An initial location of the RFID tag (or a tagged product) is set to obtain an initial vector. The RFID tag and the antenna are respectively rotated with a first axis and a second axis to detect characteristics of the RFID tag in all directions, and the first axis and the second axis are perpendicular. A polarization angle of the RFID tag is calculated according to the initial vector of the RFID tag and a location of the RFID tag after rotation. A compensation value is obtained through a look up table according to the polarization angle, so as to compensate for the axial ratio of the antenna.
摘要:
A method for compensating the axial ratio of an antenna for testing radio-frequency identification (RFID) tags and an apparatus using the method are provided. The method includes the following steps. An initial location of the RFID tag (or a tagged product) is set to obtain an initial vector. The RFID tag and the antenna are respectively rotated with a first axis and a second axis to detect characteristics of the RFID tag in all directions, and the first axis and the second axis are perpendicular. A polarization angle of the RFID tag is calculated according to the initial vector of the RFID tag and a location of the RFID tag after rotation. A compensation value is obtained through a look up table according to the polarization angle, so as to compensate for the axial ratio of the antenna.
摘要:
A method and an apparatus of radio frequency (RF) testing are provided. The present method includes the following steps. A receiver and a transmitting antenna of a transmitter are controlled to move towards a direction, wherein the transmitter transmits a wireless signal to the receiver through the transmitting antenna. A specific power is measured every time when one of a plurality of predetermined sampling points is reached. In the foregoing moving and measuring steps, the relative distance and relative azimuth angle between the receiver and the transmitting antenna remain unchanged, and the frequency of the wireless signal also remains unchanged.
摘要:
A method utilizing an ultrasonic distance sensor to measure distances between the sensor and an object includes the steps of: identifying an object using a first object tracking apparatus; adjusting a first rotation direction of the first object tracking apparatus to pinpoint the object; measuring a distance between the object and the first object tracking apparatus; and obtaining a location of the object in accordance with the distance and the first rotation direction.