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Dual-Band Band-Stop Filter using Multiple Hexagonal Microstrip Line for Chipless RFID Sensor
(2023-01-01)
Suwalak, Rattapong
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Lertsakwimarn, Kittima
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Lertwiriyaprapa, Titipong
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Phongcharoenpanich, Chuwong
;
Torrungrueng, Danai
The dual-band band-stop filter using a hexagonal-shape microstrip line is presented in this paper. The chipless RFID with the band-stop filter used to determine the relative permittivity of material under test and identify characteristic based on the unique responded signal from the chipless RFID sensor. This paper proposed the multiple microstrip line structure with a quarter-wavelength transformer to generate an identification (ID) code, i.e., ID-01, ID-10, and ID-11 at the center frequency of 2.2 GHz and 2.7 GHz. From the results, the proposed chipless RFID sensor can be identified and determined the relative permittivity of the LWC.
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A Compact Label-Typed L-Shaped Slot UHF RFID Tag Antenna Mountable on Metallic Cans
(2022-01-01)
Lertsakwimarn, Kittima
;
Suwalak, Rattapong
This paper presents the design of a compact label-type UHF RFID tag antenna which designed for mounted on metallic items in supply chain goods such as metallic cans. The proposed tag antenna is a single copper line with L-shaped slot. This design is intended to obtain a narrow structure to make it possible to attach the tag antenna in the longitudinal and transverse along the metallic cans without being bulky. The tag antenna impedance is easy for turning impedance matching with RFID IC chip by adjusting the length and width of the line. The overall dimension of the proposed tag antenna on the metal actual cans is 94 × 6 × 0.8 m3. The proposed tag antenna covers the targeted UHF RFID bands (920-925 MHz) with -10 dB|Γ| bandwidth of 25 MHz.
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Wideband UHF Reflector Antenna for DVB Applications
(2019-12-01)
Osklang, Pracha
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Sakonkanapong, Arnon
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Dentri, Sitthichai
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Lertsakwimarn, Kittima
;
Luadang, Bancha
This paper presents the design, measurement, and development of a bow tie wideband antenna using scutcheon shape with inductive-loaded for DVB applications. The antenna consists of 3 elements; a scutcheon bow tie radiator, a line inductive-loaded and a square reflector. The element of bow tie achieves a lower frequency of 470 MHz. The element of line inductive-loaded achieves an upper frequency of 860 MHz for |S11| of less than-10 dB. The measured results of the prototype antenna are good agreement. The impedance bandwidth of 81.27%, which covering a frequency range from 374 MHz to 886 MHz. The measured gains are flat around 7 dBi over the DVB band. The HPBW in the vertical and horizontal planes are 56.8° and 117.3° at frequency of 660 MHz.
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Recent Advances in RFID Sensors for Construction Material Monitoring Applications (Invited Paper)
(2018-07-02)
Suwalak, Rattapong
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Lertsakwimarn, Kittima
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Phongcharoenpanich, Chuwong
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Akkaraekthalin, Prayoot
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Torrungrueng, Danai
This paper presents recent advances in radiofrequency identification (RFID) sensors for monitoring applications of construction material products (CMPs) (e.g., light weight concrete (LWC) and concrete). These RFID sensors can offer both identification and sensing capabilities simultaneously without any additional sensors. The research and development of both chipped and chipless RFID sensors will be discussed during presentation, including their interesting applications.
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Dual-band chipless RFID sensor for a material quality monitoring application
(2017-01-17)
Suwalak, Rattapong
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Lertsakwimarn, Kittima
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Phongcharoenpanich, Chuwong
;
Torrungrueng, Danai
The dual-band chipless RFID sensor is proposed to employ as a wireless material quality monitoring application. A printed perpendicular rectangular loop tag and a printed concentric rectangular loop tag are designed and optimized using the CST Microwave Studio program. The chipless RFID sensors are located on a material surface to determine qualities of a material under test. From numerical results, it is found that the proposed dual-band chipless RFID-sensor has a significant different radar cross section (RCS) compared with the single-band one. Therefore, both RFID sensors can be used together in the material quality monitoring system to improve the accuracy.
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Design of circularly polarized unidirectional antenna using probe-excited circular ring antenna above the square reflector with inserted metallic slabs
(2017-01-17)
Phongcharoenpanich, Chuwong
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Lertsakwimarn, Kittima
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Sukkamat, Rungsinee
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Mhudtongon, Nattaset
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Kosulvit, Sompol
This paper proposes a circularly polarized unidirectional antenna using a probe excited circular ring with inserted perpendicular slabs above the square reflector for UHF-RFID system. The measured S<inf>11</inf> ≤ -10 dB covers 884-1000 MHz or 12.31% bandwidth, and 3-dB AR bandwidth of 900-1000 MHz or 10.53% bandwidth. The maximum gain is 8.35 dBic. The half-power beamwidths in xz-and yz-planes are 66.3 and 66.7 degrees, respectively.
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A ring antenna for dual-sense circular polarization
(2016-10-11)
Lertsakwimarn, Kittima
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Phongcharoenpanich, Chuwong
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Fukusako, Takeshi
A design of dual circularly polarized antenna is proposed. By two dual L-shaped probe structure, dual-sense circular polarization (CP) for radio astronomy is achieved. The dual L-shaped probes are place in the radial direction of a circular ring to obtain both right hand circular polarization (RHCP) and left hand circular polarization (LHCP). According to our simulation results, the proposed antenna element could achieve-10dB-level of S<inf>11</inf> and more than-20dB-level of isolation in frequency range of 1.4-1.7 GHz. The antenna element broadside gain is approximately 8.5 dBic. The axial ratio (AR) below 3dB is more than 300 MHz in each circular polarization state. The details of simulation results for the proposed design are presented and discussed.
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Low-profile metallic tag antenna for UHF-RFID system
(2016-01-01)
Lertsakwimarn, Kittima
;
Phongcharoenpanich, Chuwong
A low-profile ultrahigh frequency (UHF) passive radio frequency identification (RFID) tag for the applications to distinguish metallic from non-metallic is presented. The proposed antenna structure consists of T-shaped structure and parasitic parallel longitudinal strip lines which are placed symmetrically. There is an air gap between the head parts of T-shaped structure for installing IC chip. The head part has shorting pin that connects the ground plane. The parametric studies are described. From the results, the tag antenna with defected ground plane has larger difference of maximum read range compared between the tag on metallic plate and the tag in free space. The proposed UHF-RFID tag antenna can adjust the impedance characteristic by changing the length of the middle longitudinal strip. The tag antenna prototype is fabricated with an area of 90 × 20 × 3 mm<sup>3</sup> (0.28λ<inf>0</inf> × 0.06λ<inf>0</inf> × 0.009λ<inf>0</inf>). The measured results of maximum read range on the metallic plate and in free space are 83 and 24 mm, respectively. The simulated and measured results of the proposed RFID tag antenna are discussed.
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A Low-Profile and Compact Split-Ring Antenna with Horizontally Polarized Omnidirectional Radiation
(2015-01-01)
Lertsakwimarn, Kittima
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Phongcharoenpanich, Chuwong
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Fukusako, Takeshi
This paper presents a low-profile and compact printed antenna having an omnidirectional radiation pattern with horizontal polarization to the ground. The proposed antenna consists of an inner small fed ring, an outer coupled split ring, and a ground plane. The overall dimension of the proposed antenna is 45 mm × 50.5 mm × 11.6 mm (0.138λ <inf>0</inf> × 0.155λ <inf>0</inf> × 0.036λ <inf>0</inf>). The-10-dB S 11 of the antenna covers the 920-MHz RFID band, and the gain is about 1.45 dBi in the parallel direction to the ground plane. The measured results show good agreements with the simulated results. Furthermore, the reasons for the low-profile structure and the omnidirectional radiation pattern are also discussed.
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Design of circularly polarized and electrically small antenna with omnidirectional radiation pattern
(2014-12-01)
Lertsakwimarn, Kittima
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Phongcharoenpanich, Chuwong
;
Fukusako, Takeshi
This paper presents an electrically small and circularly polarized antenna with an omnidirectional radiation pattern. The antenna consists of a horizontal loop element enclosed by two U-shaped elements and a vertical element from the feeding point. The radiation pattern of the circular polarization is omnidirectional and has a maximum gain of -2 dBic in parallel to the ground plane at the 900 MHz band. The antenna dimensions are 48 × 20 × 13.8mm (0.14 λ × 0.06 λ × 0.04 λ) with ka = 0.476 (i.e. < 0.5), where k is the wavenumber at the resonant frequency and a is the radius of a sphere surrounding the antenna. The dimension corresponds to the definition of an electrically small antenna. The omnidirectional circularly polarized pattern of a prototype antenna shows good agreement with that of the simulation. In addition, this paper introduces a mechanism that generates omnidirectional circular polarization from electrically small antennas.

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