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

fYear

2013

fDate

25-28 Aug. 2013

Firstpage

184

Lastpage

187

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Technology & Computational Electromagnetics (ICMTCE), 2013 IEEE International Conference on

Conference_Location

Qingdao

Type

conf

DOI

10.1109/ICMTCE.2013.6812416

Filename

6812416