Linearly tapered meander line broadband monopole tag antenna with T‐match for Ultra High Frequency Radio Frequency Identification applications

Abstract

In this paper, a compact, broadband linearly tapered meandered monopole tag antenna for UHF-RFID is designed and optimized using particle swarm optimization (PSO) algorithm. An inductive T-match network is utilized for impedance matching with capacitive Higgs-4 chip. The optimization goal of PSO was conjugate matching and in consequence the maximization of read range. Equivalent circuit of the proposed tag antenna is derived using ADS software to validate its impedance characteristics. The performance of the proposed tag in terms of tag power sensitivity, read range, realized gain, and differential radar cross section has been experimentally characterized. To check the tolerance of the designed tag to various object platforms, its read range performance is also verified on objects like wood, fiber, plastic, and so forth. Furthermore, read pattern of the proposed tag has been measured and found to have figure of eight in E-plane and omnidirectional in H-plane. Experimental results reveal that the proposed tag covers 865-867 MHz (ETSI band, Europe) and 902-928 MHz (FCC band, United States) both major RFID bands with a read range of 10 and 12 m, respectively. The proposed tag has 2060 mm 3 of volumetric size with maximum measured readable distance of 12 m with EIRP of 3.28 W. K E Y W O R D S differential radar cross section (ΔRCS), radio frequency identification (RFID) tag antenna, read range, tag sensitivity, ultra-high frequency (UHF)

Glasses frame‐based wearable antenna design for ultrahigh frequency radio frequency identification and Internet of Things applications using characteristic mode analysis

“…Recently, many UHF RFID tags have been designed for wearable applications. A linearly tapered meander line broadband monopole tag antenna for the UHF‐RFID band is reported in Reference 12, they used practical swarm optimization (PSO) algorithm for miniaturization, it has a small volume as compared to other tags in literature but is still large for IoT devices moreover proposed tag antenna provides low read range when mounted on different objects and not tested on the metallic surface. A dual‐band UHF‐RFID tag is proposed in Reference 13, researchers enhanced its read range by using an artificial magnetic conductor (AMC) structure and inverted L shape strip.…”