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    UHF-RFID tag antenna using T-matching and double-ended rectangular loop techniques for wristband applications
    (2016-01-01)
    Pumpoung, Tajchai
    ;
    Wongsiritorn, Pitchanun
    ;
    Phongcharoenpanich, Chuwong
    ;
    Kosulvit, Sompol
    This paper presents the UHF-RFID tag antenna applied on a human body (wrist). The proposed tag antenna was fabricated on a thin FR4 substrate (ε<inf>r</inf>= 4.3) with the thickness of 0.25 mm. The T-matching and double-ended rectangular loop techniques are presented to improve an antenna impedance to achieve a matching condition with the NXP G2XL IC chip with the impedance of 21.29 − j191.7 Ω, considering at the center frequency of the standard in Thailand with 922.5 MHz. The proposed tag antenna can apply for the standard of UHF-RFID in Thailand (920–925 MHz) and FCC (902–928 MHz). The radiation patterns of the tag antenna with and without wrist models are unidirectional and omnidirectional, respectively.
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    Design of Wideband Tag Antenna for Ultra-High-Frequency Radio Frequency Identification System Using Modified T-Match and Meander-Line Techniques
    (2015-07-04)
    Pumpoung, Tajchai
    ;
    Phongcharoenpanich, Chuwong
    Ultra-high-frequency radio frequency identification is widely used in logistics and inventory management due to its compact size, distant readability, and speedy response. Nevertheless, current readability distance of the existing ultra-high-frequency radio frequency identification does not satisfy the requirements of certain applications, giving rise to research works to improve upon the present technology. Therefore, the focus of this article is to develop a compact wideband passive tag antenna operable in the entire ultra-high-frequency radio frequency identification band of 860-960 MHz. The impedance bandwidth, i.e., |S<inf>11</inf>| (dB), of the proposed tag antenna was set at less than -10 dB. The modified T-match and meander-line techniques were utilized to enhance the impedance of the tag antenna so that it is not only compatible with an integrated circuit chip (NXP G2XL; NXP Semiconductors, 2012) but also operable in the ultra-high-frequency radio frequency identification international standard bandwidth. The proposed tag antenna was fabricated on an FR-4 substrate with a thickness of 0.25 mm and cross-section dimension of 11 mm (W) × 88 mm (L). The radiation pattern of the antenna is omnidirectional with linear polarization and maximum gain of 2.05 dBi.
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    Specifically designed tag antenna based on I-Loop structure for UHF RFID applications
    (2015-01-01)
    Pumpoung, Tajchai
    ;
    Wongsiritorn, Pitchanun
    ;
    Phongcharoenpanich, Chuwong
    ;
    Kosulvit, Sompol
    This paper presents the UHF RFID tag antenna designed for the operating frequency band of 920–925 MHz corresponding to the standard of UHF RFID in Thailand. The tag antenna was fabricated by using a thin FR4 substrate (ε<inf>r</inf> = 4.3) with the thickness of 0.25 mm. The pattern of the tag antenna is omnidirectional. The “KMITL” text bent dipole is the technique to reduce the physical size of the tag antenna. The I-loop structure is used to improve the impedances of the tag antenna to achieve the conjugate matching with the IC chip. The impedance of the IC chip at the frequency of 922.5 MHz is 21.29 − j191.7 Ω. The maximum read range is 4.5 m.
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    Meander-line antenna with arc structure for UHF-RFID Tag
    (2011-12-01)
    Wongsiritorn, Pitchanun
    ;
    Pumpoung, Tajchai
    ;
    Phongcharoenpanich, Chuwong
    ;
    Nuangwongsa, Kanawat
    ;
    Kosulvit, Sompol
    The new configuration of the RFID tag antenna is presented in this paper. It consists of meander-line with arc structure and T-matching technique to accomplish the very small tag antenna for an operation of the frequency band 920-925 MHz, corresponding to the standard of UHF RFID in Thailand. The electrical size of the proposed tag antenna is approximately 0.025λ <inf>0</inf> 0.24λ <inf>0</inf> or 0.8 mm × 79 mm, and it is designed by using NXP G2XL IC chip with the impedance of 21.29-j191.7 ω at the frequency of 922.5 MHz. The proposed tag antenna obtains the omnidirectional pattern with 0.91 dBi gain. It is fabricated on FR 4 with the thickness of 0.25 mm. The maximum read range is 8 m, which was measured by 4 W EIRP reader. © 2011 IEEE.