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16 Patch=dipole orientations favorable (left) and unfavorable (right). Th e Z ta was (is) parallel to the earth, that is, horizontally polarized. Thus although radio and television do not share the same frequency bands, there is still little or no interference due to the respective polarizations. The orientation issue in RFID is normally addressed by providing a circularly polarized antenna on the interrogator and a dipole antenna on the tag. Thus, the dipole will receive energy more favorably through virtually any possible orientation where the plane of the dipole if rotated in such a manner that the plane in which it is rotated will be parallel to the plane of the circularly polarized transmitting antenna.

13, with any other orientations in between these two extremes. 13, when transmitter or receiver may not be permanently aligned. While radio transmitting antennas are typically mounted vertically for vertical polarization, television antennas are horizontally polarized. Before the days of cable and satellite TV, rooftops were adorned with antennas formed with multiple horizontal elements resulting in what is termed a Yagi antenna. 14 Linearly polarized antennas with most favorable orientation. 15 Planes of the interrogator antenna (a) and rotated tag antenna (b) and (c).

In addition, the six Auto-ID Centers were renamed Auto-ID Labs. In April 2005, a seventh Auto-ID Lab was admitted to the Federated Auto-ID Labs. kr=), headed by Prof. Sang-Gug Lee. During the Auto-ID Center years of operation (1999–2003), more than 110 Auto-ID Center research papers were published. html) formed the basis of today’s EPCglobal Network. Before its hand over to EPCglobal, the Auto-ID Center also published the following specifications: . 900 MHz Class 0 Radio Frequency (RF) Identification Tag Specification .

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