Abstract
A compact loop antenna is presented for mobile ultrahigh frequency (UHF) radio frequency identification (RFID) application. This antenna, printed on a 0.8 mm thick FR4 substrate with a small size of 31 mm × 31 mm, achieves good impedance bandwidth from 897 to 928 MHz, which covers USA RFID Band (902–928 MHz). The proposed loop configuration, with a split-ring resonator (SRR) coupled inside it, demonstrates strong and uniform magnetic field distribution in the near-field antenna region. Its linearly polarized radiation pattern provides available far-field gain. Finally, the reading capabilities of antenna are up to 56 mm for near-field and 1.05 m for far-field UHF RFID operations, respectively.
Highlights
Radio frequency identification (RFID) technology has been rapidly developed for automated identification and tracking of objects in warehouse, supply chain, industry, and commerce [1]
Mobile ultrahigh frequency (UHF) RFID technology has received much attention owing to its advantages in cost, portability, and item-level applications
Few papers about UHF reader antenna for both near-field and far-field operations are presented, but they have too large size to integrate in the mobile phone: one has a dimension of 184× 174 mm2 [14], and another smaller antenna is 72.3×72.3 mm2 [15]
Summary
Radio frequency identification (RFID) technology has been rapidly developed for automated identification and tracking of objects in warehouse, supply chain, industry, and commerce [1]. The challenge of mobile UHF RFID reader is that the reader antenna must be miniaturized into the mobile phone and have both near-field and far-field operation for various objects and applications [3]. Few papers about UHF reader antenna for both near-field and far-field operations are presented, but they have too large size to integrate in the mobile phone: one has a dimension of 184× 174 mm2 [14], and another smaller antenna is 72.3×72.3 mm2 [15]. In order to address the size constraint problem, we have designed a loop antenna with both near-field and far-field characteristics. It has too narrow bandwidth of 13.5 MHz (915.5–929 MHz) [16]. The reading capability of prototype is up to 56 mm with near-field RFID tag and up to 1.05 m with conventional far-field RFID tag
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