Abstract
This study developed a miniature tag antenna attached to a backing metal for ultrahigh-frequency radio frequency identification (RFID) applications. The impedance of this antenna can be easily controlled at the desired fixed frequency by using different mechanisms and was not considerably affected by backing metal size. This antenna comprises a radiating patch with double I-shaped slots and a ground layer shorted to a narrow inductive plate. Loading a closed slot in the center of the patch and the open slits enabled flexible frequency tuning to match the complex impedance of the microchip used. This tag antenna has a low profile of $28.02\times 25.02\times2.61$ mm3 ( $0.086\times 0.076\times 0.0079\,\,\lambda _{0}^{3}$ ), and it provides a high power transmission coefficient of 99.74%, realized gain of −2.3 dB, and a reading distance of 8.1 m when it is located at the center of a metallic plate of size $250\times250$ mm2. The operational frequency of the proposed antenna was designed to reside the frequency bands for North and South America (860–960 and 902–928 MHz, respectively). Measurements of the antenna prototype proved that the experimental results agreed with the simulated data.
Highlights
The manufacturing cost of radio frequency identification chips has decreased greatly owing to rapid developments in semiconductor technology
To determine the input impedance of the proposed antenna, the measurement was performed using a balun probe applied through a cable with a characteristic impedance of 50, which was connected to the vector network analyzer (VNA)
The measured and simulated reflection coefficient and power transmission coefficient are shown in Fig. 17, and the results indicate that the proposed antenna radiated best at 915 MHz, where the measured and simulated reflection coefficients were |S11| = 26 dB and |S11| = 28 dB, respectively
Summary
The manufacturing cost of radio frequency identification chips has decreased greatly owing to rapid developments in semiconductor technology. Smaller RFID chips with lower power consumption, greater memory capacity, faster signal processing, wider design choices, and more secure data transmission are available [1]. In a practical passive RFID system, each individual object is assembled with a small and low-cost tag. A tag includes an antenna designed by users, and it can operate in various frequency bands. The behavior of an ideal RFID system is unaffected by factors such as orientation, environment, and the presence of the object on which the tag is placed [4]. As a tag antenna is usually located on or near a metallic object, the properties of this object strongly influence the operational effectiveness and principal parameters of the antenna, such as
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
