Abstract
A broadband circularly polarized stacked probe-fed antenna suitable for UHF RFID applications is presented and studied. The proposed antenna is fed by two probes which are connected to a hybrid coupler. Two parasitic patches are stacked above a primary probe-fed patch to enhance the bandwidth of the antenna. The optimized antenna prototype achieves gain of more than 6.5 dBic, axial ratio of less than 3.0 dB, and return loss of less than−15 dB over the UHF band of 820–980 MHz (17.7%). Parametric studies are carried out to demonstrate the effects of antenna geometry parameters on the performance. The proposed antenna can be a good candidate for UHF RFID applications.
Highlights
Radio frequency identification (RFID) technology has been rapidly developing in recent years and the applications have been found in many service industries, distribution logistics, manufacturing companies, and goods flow systems [1, 2]
This paper presents a broadband circularly polarized stacked probe-fed patch antenna for ultra high-frequency (UHF) RFID applications
A broadband circularly polarized stacked probed-fed patch antenna has been proposed for UHF RFID applications
Summary
Radio frequency identification (RFID) technology has been rapidly developing in recent years and the applications have been found in many service industries, distribution logistics, manufacturing companies, and goods flow systems [1, 2]. The range and the scalability of RFID systems are strongly dependent on the operating radio frequency of the systems. Due to the merits of high data transfer rate and long detection range, passive RFID systems at ultra high-frequency (UHF) band are preferred in many applications. The UHF used for RFID systems spans the range of 840–960 MHz. a reader antenna covering whole RFID UHF band is conducive to system configuration, system implementation, and cost reduction. The antenna is designed to cover entire RFID UHF band of 840–960 MHz with desired specifications such as high gain, low axial ratio (AR), and good impedance matching. The parametric studies provide the engineers with information to design and modify such an antenna
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