UHF RFID tag antenna based on the DLS‐EBG structure for metallic objects

Abstract

In this study, a novel compact radio frequency identification (RFID) tag antenna with a combination of a dipole and the double‐layer symmetric electromagnetic band gap (DLS‐EBG) structure is proposed for metallic objects in ultra‐high‐frequency (UHF) band. The DLS‐EBG unit cell consists of a symmetrical double‐layer structure and offset vias for tag miniaturisation. The equivalent circuit model of the unit cell is developed to analyse reflection phase characteristics. The measurement results show that the bandwidth ranges from 876 to 992 MHz and the impedance matching of the tag remains stable as the metal plate changes. The reading distance of the tag on the metal plate is up to 12.3 m under the transmitted equivalent isotropic radiated power (EIRP) of 36 dBm. Measurement and simulation results agree well.

Low-Profile Interdigitated UHF RFID Tag Antenna for Metallic Objects

“…The reference [41] reported a dual-layer tag antenna constructed from four PIFAs and the impedance matching obtained by shorting the stub lines to the ground. In [8], a novel folded dipole antenna with a symmetric dual-layer electromagnetic band gap (DLS-EBG), whereas its structure included an offset of vias. In these studies [8], [41], the general structure of the multi/doublelayer tag antenna, is over 2 mm thick and contains metallic vias.…”

“…In [8], a novel folded dipole antenna with a symmetric dual-layer electromagnetic band gap (DLS-EBG), whereas its structure included an offset of vias. In these studies [8], [41], the general structure of the multi/doublelayer tag antenna, is over 2 mm thick and contains metallic vias. Such construction is not desired for metal-mountable UHF tag antennas, and adjusting the input impedance/operation frequency is tedious.…”

“…The slab of AMC possesses a high dielectric constant and an air gap or foam separated between the meandered dipole antenna and AMC substrate. In addition, the employment of electromagnetic bandgap (EBG) could prevent the impedance mismatch and the tag's gain 𝐺 𝑎 is also improved [8]. The EBG structure has been employed as threelayer mushroom-like EBG material [9], EBG cells surrounding the antenna with metallic vias [10], or by etching a lattice of circular slots in the EBG ground surface [11].…”

Designing UHF RFID tag antennas with Barcode shape for dual‐technology identification

“…The capability of designing passive Ultra High Frequency Radio-Frequency IDentification (UHF RFID) tags in addition to the availability of more and more performing RFID chips is contributing to the capillary diffusion of the RFID technology, with more and more interest from both academia and industry, and widespread applications in the most disparate sectors [1][2][3][4][5][6][7].…”

Design and Evaluation of a Planar I-Shaped Folded-Patch Antenna for Compact Passive Uhf Rfid Tags to Cohere on Metal

“…For example, effective solutions are composed of increasing the distance between the tag and the surface of the metal object [1], folding the dipole arm into multiple parts [2], etc. Another way is to introduce an artificial magnetic conductor (AMC) [3,4] or electromagnetic bandgap (EBG) [5] structures, both of which are capable of isolating the antenna from its backing metal. However, the thickness and cost of the tag will greatly increase while achieving good read performance.…”