Title :
A shelf antenna using near-field without dead zones in UHF RFID
Author :
Hong, J. ; Choo, J. ; Ryoo, J. ; Choi, C.
Author_Institution :
LS Ind. Syst., Anyang
Abstract :
This paper presents a shelf antenna for near-field RFID systems which has an electromagnetic field distribution characteristic without any dead zones presented widely in the vicinity of reader antennas. These dead zones are caused by the electric-magnetic field cancelation since an incident wave is summed with the reflected wave caused by the terminals on the feed line of an antenna. The proposed antenna is made up of a feed line on the bottom layer and a meander line on the top layer in a rectangular waveguide. The feed line acts as a principle of standing wave having periodical dead zones and the meander line acts as a radiator coupled with the feed line of bottom layer. Therefore, these reactions between the feed line and the meander line make the proposed shelf antenna eliminate the effect of dead zones on the surface of the antenna properly.
Keywords :
UHF antennas; antenna feeds; electromagnetic wave reflection; radiofrequency identification; rectangular waveguides; UHF RFID; antenna feed line; dead zones; electric-magnetic field cancelation; electromagnetic field distribution; meander line; near-field RFID systems; reader antennas; rectangular waveguide; reflected wave; shelf antenna; standing wave; Antenna feeds; Antenna theory; Electromagnetic fields; Electromagnetic scattering; Frequency; Hafnium; Magnetic field measurement; Radiofrequency identification; Transmitting antennas; UHF antennas;
Conference_Titel :
Industrial Technology, 2009. ICIT 2009. IEEE International Conference on
Conference_Location :
Gippsland, VIC
Print_ISBN :
978-1-4244-3506-7
Electronic_ISBN :
978-1-4244-3507-4
DOI :
10.1109/ICIT.2009.4939492