Title :
Square annular-ring antenna with circular polarization for UHF RFID reader
Author :
Son, Wang-Ik ; Tae, Hyun-Sung ; Min, Sang-Bo ; Lee, Moon-Que ; Yu, Jong-Won
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea
Abstract :
A square annular-ring antenna with circular polarization (CP) for ultra-high-frequency (UHF) radio frequency identification (RFID) reader is presented. The proposed annular-ring antenna is composed of square-shaped annular-ring radiator, which is fed by four equal amplitude signals with 90° phase difference, and reflector suspended below the radiator. The proposed antenna is matched and optimized using the 4-port antenna matching condition. Experimental results show that the proposed antenna of size 200 × 200 × 11 mm3 has the peak gain of 7.0 dBic at 915 MHz, front-to-back ratio (F/B) of 30.0 dB, axial ratio under 1.5 dB.
Keywords :
polarisation; radiofrequency identification; reflector antennas; 4-port antenna matching condition; UHF RFID reader; amplitude signals; circular polarization; frequency 915 MHz; gain 1.5 dB; gain 30 dB; phase difference; reflector; square annular-ring antenna; square-shaped annular-ring radiator; ultra-high-frequency radio frequency identification; Antenna feeds; Antenna measurements; Frequency measurement; Gain; Radiofrequency identification; UHF antennas; RFID reader antennas; Square annular-ring antenna; circular polarization;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
