Summary
International Symposium on Antennas and Propagation
2013
Session Number:TA-P
Session:
Number:TA-P-9
Novel Compact Circularly Polarized Patch Antenna for UHF RFID Handheld Reader
M. J. Chang, H. M. Chen, Y. F. Lin, Wilson W. C. Chiu,
pp.-
Publication Date:2013/10/22
Online ISSN:2188-5079
Summary:
A compact X-shaped slotted square-patch antenna is proposed for circularly polarized (CP) radiation. A cross-strip is embedded along the X-shaped slot for a novel proximity-fed technique to generate CP radiation in the UHF band. In the proposed design, two pairs of T-shaped slots are etched orthogonally on the square patch, connected to the center of the X-shaped slot for CP radiation and antenna size reduction. Proper adjustment of the length and coupling gap of the crossstrip will excite two orthogonal modes with 900 phase difference for good CP radiation. Simulated and measured results indicate that the proposed structure can achieve circular polarization. A measured impedance bandwidth (VSWR? 2) of about 3.0% (909- 937 MHz) and a 3-dB axial-ratio (AR) bandwidth of about 1.3% (917-929 MHz) were obtained.