Abstract
This paper presents a Circularly Polarized Microstrip Patch Antenna (CPMPA) miniaturization with parasitic elements, suitable for UHF RFID systems. The antenna consists of a half E-shaped patch with cuts. A truncated corner patch can generate an additional Circular Polarization (CP) radiation mode and further enhance the axial ratio. Two symmetric cross shaped slots along the horizontal axis of the CPMPA have been embedded, and its dimension optimization has been based on parametric analysis. Thanks to this slotted structure and reduced surface area, good CP quality has been obtained with a 25% overall size reduction. The proposed antenna is lightweight, low profile, simple, and easily produced. The structure’s simulation is made using CST Studio Suite 2014 to compute return loss (S11), gain, and the axial ratio of the antenna while the overall miniaturized antenna’s volume is 77mm×58mm×1.6mm operating at 915MHz.
Highlights
Radio Frequency Identification (RFID) is widely used in many applications
ultra-high frequency (UHF) RFID must provide appropriate isolation for high reader sensitivity, which is a key to an extended reading range of the RFID reader
Several antennas have been designed the last few years for RFID readers, such as the helical antenna [3], the loop antenna [4], the PIFA antenna [5], the unipolar antenna [6], the Yagi antenna printed with three elements [7], etc
Summary
Radio Frequency Identification (RFID) is widely used in many applications. UHF RFID must provide appropriate isolation for high reader sensitivity, which is a key to an extended reading range of the RFID reader. The aim is to achieve higher performance, due to its low reflection coefficient, good gain, inherent power, and circular polarization, while maintaining a simple architecture that would make the RFID reader suitable for bi-static operation. Many studies have been conducted in order to reduce these disadvantages by making a different approach regarding the MPA’s geometry, such as the use of slots and splits, like the E-shaped [9], U-shaped [10], L-shaped [11] structures This led to the improvement of performance to a certain level that made them widely used in wireless applications such as military devices, GPS, satellite communications, RFID, etc. The modifications made on this structure are mainly two symmetrical cross slots that contribute to its miniaturization, and the improvement of its reflection coefficient
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