Title :
Tunable Near-Field Focused Circular Phase-Array Antenna for 5.8-GHz RFID Applications
Author :
Siragusa, Romain ; Lemaître-Auger, Pierre ; Tedjini, Smail
Author_Institution :
Lab. de Conception et d´´Integration des Syst. (LCIS), Grenoble Inst. of Technol., Valence, France
fDate :
7/3/1905 12:00:00 AM
Abstract :
An RFID-compatible focused circular phase-array antenna working at 5.8 GHz is proposed, which is theoretically analyzed and experimentally demonstrated. It consists of 24 half-wavelength dipole antennas placed on three circles. Using only two phase-shifters, a tunable focal spot in the range of 0.4-1 m (10λ) is obtained. The antenna system is analyzed using the Huygens-Fresnel theory, which is compared to the experimental results. At a focal distance of 0.9 m, the measured beam width and focal depth are given by 0.75λ and 5λ, respectively, which are in agreement with the calculated results.
Keywords :
antenna phased arrays; dipole antenna arrays; microwave antenna arrays; microwave phase shifters; radiofrequency identification; Huygens-Fresnel theory; RFID applications; frequency 5.8 GHz; half-wavelength dipole antennas; phase shifters; radiofrequency identification; tunable focal spot; tunable near-field focused circular phase-array antenna; Antenna arrays; Antenna radiation patterns; Antenna theory; Arrays; Dipole antennas; Directive antennas; Field programmable analog arrays; Focused; near-field; phase array; radio frequency identification (RFID);
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2011.2108632
