Miniaturization of Circularly Polarized Patch Antenna for RFID Reader Applications

摘要

This paper presents a Circularly Polarized MicrostripPatch Antenna (CPMPA) miniaturization with parasiticelements, suitable for UHF RFID systems. The antenna consistsof a half E-shaped patch with cuts. A truncated corner patch cangenerate an additional Circular Polarization (CP) radiation modeand further enhance the axial ratio. Two symmetric cross shapedslots along the horizontal axis of the CPMPA have beenembedded, and its dimension optimization has been based onparametric analysis. Thanks to this slotted structure and reducedsurface area, good CP quality has been obtained with a 25%overall size reduction. The proposed antenna is lightweight, lowprofile, simple, and easily produced. The structure’s simulation ismade using CST Studio Suite 2014 to compute return loss (S11),gain, and the axial ratio of the antenna while the overallminiaturized antenna’s volume is 77mm×58mm×1.6mmoperating at 915MHz.