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Flexible Chipless RFID Sensor for permittivity sensing of Cylindrical Impedance Surface
(2023-01-01)
Suwalak, Rattapong
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Phongcharoenpanich, Chuwong
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Torrungrueng, Danai
;
Lertwiriyaprapa, Titipong
This paper presents the chipless RFID sensor characteristics when placed on the cylindrical impedance surface. The chipless RFID sensor is designed based on the multiple resonant printed on the flexible substrate of Polyimide (r = 3.5 and tan δ = 0.0027). The humidity of the material under test is identified using the chipless RFID sensor based on the multi-resonators. This chipless sensor can be generated 5 bits of identification (ID). Furthermore, the orientation effect of the plane wave is studied. The results shows that the flexible chipless RFID sensor can be identified the different dielectric constant that related with the water content in the material. Therefore, this sensor can be applied to recognize the humidity state of material under test.
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Dual-band circularly polarized flat antenna with plano convex and concave slots for RFID readers
(2017-11-01)
Wongsakulphasatch, Prawate
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Phongcharoenpanich, Chuwong
This article has proposed a circularly polarized dual-band antenna with unidirectional pattern operating at the bandwidth frequencies of 920–925 MHz and 2.40–2.48 GHz for radiofrequency identification (RFID) readers. The proposed antenna structure is of a radiating patch with a single feeder and two pairs of plano convex and concave slots. This work has innovated and utilized the convex and concave slotting technique to generate the circular polarization. The simulated results showed that the dual-band antenna is of circular polarization (CP) and unidirectional radiation pattern with the 3 dB axial ratio and the respective gains of 1.31 and 1.36 dBic for the experimental lower and upper bandwidth frequencies. An antenna prototype was subsequently fabricated and tests performed. The simulated and measured results are in good agreement, rendering the proposed dual-band antenna with plano convex and concave slots suitably applicable to the ultrahigh frequency and microwave RFID readers.
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Dual-band circular plate antenna with annular-ring slot and four-paired rectangular slots
(2013-09-02)
Boonying, Komkris
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Phongcharoenpanich, Chuwong
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Kosulvit, Sompol
This paper presents dual-band circular plate antenna with an inserted annular-ring slot and four-paired rectangular slots excited by a feeding probe for RFID applications. The operating frequencies of the RFID system are 920 MHz to 925 MHz and 2.4 GHz to 2.5 GHz. It is found that at two bands, 922.5 MHz and 2.45 GHz, the S<inf>11</inf> are -14.7 dB and -23.2 dB, respectively. The radiation pattern of the proposed antenna radiates unidirectional beam with vertical polarization for both bands. The half-power beamwidths at 922.5 MHz in XZ-plane and XY-plane are 63.4 ° and 80.1 °, whereas ones at 2.45 GHz in XZ-plane and XY-plane are 35.5 ° and 57.6 °, respectively. The measured gain is higher than 5 dBi at both frequencies. © 2013 IEEE.
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Circularly polarized UHF-RFID antenna using defected rectangular plate on the ground plane
(2012-11-26)
Phongcharoenpanich, Chuwong
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Dentri, Sitthichai
This paper presents a UHF-RFID reader antenna radiating circular polarization with unidirectional pattern. The antenna structure consists of two plates. The upper plate acted as radiating element contains notched rectangular plate, rectangular aperture and slot line. The lower plate is the ground plane. The parametric study is carried out to achieve the frequency response of 920-925 MHz according to Thailand standard of UHF-RFID system. The prototype antenna was fabricated and measured. The simulated half-power beamwidth (HPBW) in E- and H-planes are 65 and 68 degree, respectively. The measured HPBW in both planes is identical to 55 degree. The simulated and measured bandwidths are 7.26% and 10.7%, respectively. The simulated and measured axial ratios at 922.5 MHz are 0.64 dB and 0.09 dB, respectively. © 2012 IEEE.
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Printed diamond slot antenna with a bent microstrip line for 5.8 GHz RFID reader
(2012-11-26)
Phongcharoenpanich, Chuwong
;
Senathong, Rewat
This paper presents the design of 5.8 GHz reader antenna for Radio Frequency Identification (RFID) system. The printed diamond slot antenna with a bent microstrip line is presented. The measured results can achieve the operating bandwidth (|S<inf>11</inf>| < -10dB) from 5.45 GHz to 6.18 GHz and can achieve the circular polarization (axial ratio < 3 dB) from 5.71 GHz to 5.89 GHz. In addition, the antenna radiates uni-directional pattern along the frequency band. © 2012 IEEE.
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Meander-line antenna with arc structure for UHF-RFID Tag
(2011-12-01)
Wongsiritorn, Pitchanun
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Pumpoung, Tajchai
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Phongcharoenpanich, Chuwong
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Nuangwongsa, Kanawat
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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.
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A circularly polarized square plate antenna with two inclined slots for UHF-RFID reader
(2011-12-01)
Charoenchue, Putuch
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Phongcharoenpanich, Chuwong
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Phaebua, Kittisak
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Aunchaleevarapan, Kraison
This paper presents a circularly polarized square plate antenna with two inclined slots excited by a probe on square ground plane to radiate circularly polarized unidirectional beam. This antenna is proposed for installing at the reader of Radio Frequency Identification (RFID) at Ultra High Frequency (UHF) band. UHF-RFID in Thailand has the bandwidth from 920 MHz to 925 MHz, and center frequency is 922.5 MHz. The proposed antenna structure is simple because of using the single probe to feed the antenna for circularly polarized radiation. The pattern of this antenna is unidirectional beam with gain 8.6 dBic and axial ratio of 0.92 dB at center frequency. The obtained measured bandwidth is 50 MHz. © 2011 IEEE.
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An annular microstrip antenna with sectoral slots for RFID reader
(2009-12-01)
Suwalak, Rattapong
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Pongpaibool, Pornanong
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Phongcharoenpanich, Chuwong
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Krairiksh, Monai
This paper presents an annular microstrip antenna with two sectoral slots fed by a coaxial probe on a square vertical ground plane. The proposed microstrip antenna can support the dual-band operation (UHF and microwave RFID bands). From the results, the antenna has the magnitude of S11 less than -10 dB along the bandwidth of 32 MHz (3.51%) for UHF band and 140 MHz (5.76%) for microwave band. The unidirectional beam can be achieved by the proposed microstrip antenna. The beamwidth in xz- and yz-planes is 82.8 and 89 degrees at the center frequency of 922.5 MHz and beamwidth in xz- and yz-planes is 39.8 and 28 degrees at the center frequency of 2.45 GHz, respectively. This antenna has efficiently high directivity for both bands. The simulation and measurement results are shown. ©2009 IEEE.
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Design of flat spiral rectangular loop gate antenna for HF-RFID systems
(2008-12-01)
Kawdungta, Supakit
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Phongcharoenpanich, Chuwong
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Torrungrueng, Danai
This paper presents a flat spiral rectangular loop gate antenna in walk-through gate installation for improving the distribution of magnetic field in High-Frequency Radio Frequency Identification (HF-RFID) systems. The spiral structure can provide the magnetic field distribution to cover desired region in various directions. This antenna is designed as a walk-through gate for the anti-theft application. The prototype antenna was fabricated and measured to confirm the antenna performance. ©2008 IEEE.
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Improvement of communication performance for trapezoidal dual loop antennas by switching techniques
(2007-12-01)
Kawdungta, Supakit
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Wounchoum, Phairote
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Phongcharoenpanich, Chuwong
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Torrungrueng, Danai
This paper presents the switching techniques for trapezoidal dual loop antennas to improve the communication performance of Radio Frequency Identification (RFID) system at low frequency. The switching techniques use two sets of antennas in walk-through gate configuration in order that the RFID reader can activate two sets of antenna at different times. Both antennas were designed to yield the magnetic field covering the entire volume. The antenna prototype was fabricated and measured the percentage of volume to confirm the communication performance. The obtained percentages of volume in three principal axes are 100%. The experimental results verify the antenna capability in RFID system.

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