Abstract
This paper presents a passive cavity type Ultra High Frequency (UHF) Radio Frequency Identification (RFID) tag antenna having the longest read-range, and compares it with existing long-range UHF RFID tag antenna. The study also demonstrates mathematically and experimentally that our proposed longest-range UHF RFID cavity type tag antenna has a longer read-range than existing passive tag antennas. Our tag antenna was designed with 140 × 60 × 10 mm3 size, and reached 26 m measured read-range and 36.3 m mathematically calculated read-range. This UHF tag antenna can be applied to metal and non-metal objects. By adding a further sensing capability, it can have a great benefit for the Internet of Things (IoT) and wireless sensor networks (WSN).
Highlights
Radio Frequency Identification (RFID) uses electromagnetic fields to identify automatically and to track tags attached on any object.It’s used for applications like animal tagging, asset tracking, electronic passports, smartcards, store security, logistic and etc. [1]
It uses air instead of Styrofoam, the tag antenna is attached on the top-inner side of the plastic cover, four sides of the plastic cover have copper metal attached to it, the back side of plastic cover is empty, and the metal object where the cover will be placed will play the role of back metal to realize the cavity structure
This work presents a comparative study of existing long-range Ultra High Frequency (UHF) RFID tags
Summary
RFID uses electromagnetic fields to identify automatically and to track tags attached on any object. According to applications and design technology, there are many articles published about UHF active tags. A general passive UHF tags have about 10–20 m read-range based on the sensitivity of the tag chip and the types of antennas. Our passive UHF RFID tags have longer read-range than other designs. Our passive UHF RFID tag had 26 m read-range using Higgs 4 RFID Chip manufactured by Alien Tech. Higgs 4 has sensitivity of −20.5 dBm. The more sensitivity of RFID tag chip has longer read-range with the same antenna. We are going to focus on a long-range UHF passive tag and compare it to our cavity type tag antenna design.
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