Broadband UHF RFID passive tag antenna for near-body operation

Abstract

A new improved design of a RFID passive tag antenna is presented for patient identification that is operable in the full UHF RFID (860-960 MHz) band. The antenna is based on a low profile printed solution and can be placed near the human body without sacrificing reading range. Extensive numerical simulations were performed and demonstrate that the new proposed configuration improves in relation to previous known solutions for near-body or other problematic surfaces.

Compact UHF RFID balun‐like integrated tag antenna for long range detection of water bottles

“…For instance, some tag antennas incorporating a nested slot feed were proposed in Refs. [10,[22][23][24][25][26][27][28][29][30][31][32][33] to improve impedance matching, however, offering a read range of ~2.5 m. The nested slot technique showed large dimensions [24], with adverse effects in close proximity of water. Similarly, a conformal tag antenna with a reading range of 3.5 m [34,35] was proposed for a smart blood repository system to track blood bags [36].…”

Experimentally validated smart card ultra‐high frequency tag antenna for free space and near body scenarios

“…Although RFID technology is robust in free space scenarios, there are some implementation constraints for UHF tags such as proximity issues when the human body, water and metallic objects are present as they exhibit high permittivity values. For instance, if the tag is close to or on the human body, due to high conductivity properties, high power absorption occurs, reducing the gain and ultimately the read range of the tag significantly [4–8]. Conventional mass deployed UHF tag antennas that are designed for free space are mostly unable to display the same performance when used in on‐body applications.…”

“…meat or milk ensuring a read range of 2.5–3 m in the ETSI band (865.6–867.6 MHz). In [6], a broadband antenna is presented for near body operations by using two quarter wavelength patch antennas connected with a ground plane on Rogers RT 5880 substrate with dimensions of and , respectively, showing good impedance matching but at the cost of a considerable thickness of 1.575 mm, restricting it to limited space applications. In [9, 10] a tag is designed on FR4 substrate employed for human body monitoring and metallic cylinder tracking.…”

“…The reported tag is narrowband and proposed to operate at US frequency band region only. Antennas presented previously have a thickness 0.5 mm [5–8, 11] and some of them use ground planes to reduce the influence of the human body [5] ultimately making them more expensive and difficult to place in smart cards. Another tag design for a student ID card is presented for on‐body applications on a polyvinyl chloride (PVC) substrate for the US frequency band.…”

Broadband Uhf Rfid Tag Antenna for Bio-Monitoring

“…Many tag antennas have been studied when placed on-body for bio-monitoring and person tracking applications. In [5], Santiago et al present two antennas (using Rogers RT5880 as substrate) for this kind of use. The first one is composed of two quarter-wavelength patches connected to a ground plane.…”