Title :
Circularly polarized microstrip antenna with two Asymmetric Circular slots for RFID application
Author :
Xing Ying Huo ; Jun Hong Wang ; Chen, Mei E.
Author_Institution :
Key Lab. of All Opt. Network & Adv. Telecommun. Network of MOE, Beijing Jiaotong Univ., Beijing, China
Abstract :
An UHF-band circularly polarized microstrip antenna with two Asymmetric Circular slots is designed. The square microstrip patch has a single-feed configuration and two Asymmetric Circular slots. The antenna can be adopted to achieve the relatively compact circularly polarized microstrip antenna. Two Asymmetric Circular slots with different sizes along the diagonal directions are notched in the square microstrip patch to reduce the size of the microstrip antenna, and to produce circularly polarized radiation at the same time. Unbalanced patch along the diagonal directions in slotted areas is the root cause of the circularly polarized radiation. The antenna has a 6.0MHz 3-dB axial-ratio bandwidth as well as 20MHz impedance bandwidth, covers the UHF-RFID band from 920.5MHz to 924.5MHz.
Keywords :
UHF antennas; antenna feeds; electric impedance; electromagnetic wave polarisation; microstrip antennas; radiofrequency identification; slot antennas; UHF-RFID band; UHF-band circularly polarized microstrip antenna; asymmetric circular slots; axial-ratio bandwidth; circularly polarized radiation; compact circularly polarized microstrip antenna; diagonal directions; frequency 20 MHz; frequency 6 MHz; frequency 920.5 MHz to 924.5 MHz; impedance bandwidth; single-feed configuration; square microstrip patch; Bandwidth; Microstrip; Microstrip antennas; Radiofrequency identification; Slot antennas; UHF antennas; Circular Shaped slotted patch; Circular polarization; UHF; microstrip antenna; radio frequency identification;
Conference_Titel :
Microwave Technology & Computational Electromagnetics (ICMTCE), 2013 IEEE International Conference on
Conference_Location :
Qingdao
DOI :
10.1109/ICMTCE.2013.6812416
