Metal mountable UHF-RFID tag antenna with meander feed line and double T-match

Abstract

A compact ultra-high-frequency (UHF) RFID tag with meander feed line and double T-match structure is proposed. The tag is composed of a copper layer at the upper and bottom side of a Rogers 5880 substrate, with the relative permittivity of 2.2 and a UCODE G2XM/G2XL chip from NXP Semiconductor. The tag with the overall dimension of 58 x 34 x 0.85 mm 3 is not sensitive to the objects it is attached to including metallic object since the performance of the tag in free air and on metal objects remains almost the same. The double T-matching technique is implemented in the antenna design to easily match the antenna and the chip impedance. The antenna is designed to operate in Malaysia frequency range (919 -923 MHZ). The performance of the tag is evaluated through simulation in terms of impedance matching, reflection coefficient and reading range.

Metal Mountable Ladder Feed Line UHF-RFID Tag Antenna

“…From simulation, the maximum reading range obtained by the proposed tag antenna design is 3.2 m in free air and slightly lower on metal object with the distance of 3.1 m as shown in Figure 9 (a). The tag reading range obtained is 10 % higher than the previous tag antenna design in [9] as a results of using ladder feed line instead of meander feed line in the tag antenna design. The measurement of the tag reading range Figure 9 (b) shows the setup for the tag reading range measurement.…”

“…The proposed tag antenna design, which is called metal mountable ladder feed line tag antenna shows some improvement from the previous tag antenna design published in [9], in terms of size and gain, as a result of inserting a capacitive tip-loading structure and also the use of ladder feed line instead of a meander feed line respectively. The copper layer traces on the upper side of Rogers substrate formed several structures, including ladder feed line, rectangular loop, capacitive tip-loading and T-match as illustrated in Figure 1.…”

“…At the center of the copper traces, a SOT1040 chip in form of strap from NXP Semiconductor with the impedance value of 14.8 -j127.1Ω is attached [10]. The overall dimension of the tag antenna is 53 x 28 x 0.8 mm 3 , which is 25% smaller than the tag antenna design in [9]. Table 1 shows the parameters and dimensions of the antenna structure.…”

Compact microstrip patch UHF-RFID tag antenna for metal object

“…As a transferred from the antenna to The rectangular loop which line is used in the antenna desi of the antenna, so that the ante the desired operating frequency the meander feed line, the lo element and will only give e antenna. But once the rectangu line are connected to each ot become part of the radiating power received from the mean [15].…”

On‐body semi‐electrically‐small tag antenna for ultra high frequency radio‐frequency identification platform‐tolerant applications

“…A number of small platform-tolerant tag antennas for on-body applications made of rigid substrates have already been published, e.g. in [12][13][14][15][16][17][18][19][20][21][22][23]. However, their main disadvantage is their very small radiation efficiency, typically lower than 20%, which results in negative gain and a short read range.…”