Phongcharoenpanich, Chuwong

Preferred name

Alternative Name

PHONGCHAROENPANICH, Chuwong

Phongcharoenpanich, C.

Main Affiliation

School of Engineering

chuwong.ph@kmitl.ac.th

Now showing 1 - 10 of 17

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Effect of antenna frequency bands on the resolution of GPR images
(2017-12-19)
Yochanang, Kiattisak
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Boonpoonga, Akkarat
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Akkaraekthalin, Prayoot
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Bannawat, Lakkhana
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Phongcharoenpanich, Chuwong
This paper presents an investigation of the effect of the antenna frequency band on the ground penetrating radar (GPR) image resolution. The investigation is achieved through simulations. In the simulations, two Scutcheon antennas are modeled as the receiving and transmitting antennas. A cross-shaped object is buried under the ground constructed with the dielectric material. The Gaussian pulses with different frequency bands is transmitted and propagated to the buried object. The EM wave scattered from the object is collected to form the GPR image. The simulation results obtained from different frequency band show that the resolution of the GPR image obtained from the wider frequency band is better than that of the GPR image obtained from narrower one.
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Wideband dielectric properties of silicon and glass substrates for terahertz integrated circuits and microsystems
(2021-05-01)
Chudpooti, Nonchanutt
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Duangrit, Nattapong
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Burnett, Andrew D.
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Freeman, Joshua R.
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Gill, Thomas B.
This paper presents a comprehensive study of the optical and electrical dielectric material properties of six commonly-used silicon and glass substrates at terahertz (THz) frequencies, including refractive index, absorption coefficient, dielectric constant and loss factor. The material characterization techniques used in this paper feature THz time-domain transmission and reflection spectroscopy with the measurement frequencies from 0.5 THz up to a maximum of 6.5 THz. Of the six selected dielectric and semiconductor substrates, two are silicon wafers with resistivities ranging from 0.001 to 0.02 Ω-cm. From the measurement results, loss tangents of the selected silicon wafers range from 0.680 to 5.455 and the dielectric constants are from 1.079 to 17.735. The four other wafers are all glass-based substrates: D263 glass, Borofloat 33 glass, fused silica and Sapphire. From the measurements, it is found that the THz dielectric properties vary considerably between the substrate samples e.g. dielectric constants range from 1.925 to 3.207 while loss tangents are from 0.042 × 10-3 to 0.127. Most of the selected silicon and glass-based substrates are quite useful for many THz applications, e.g., THz integrated circuits (THz ICs), THz microsystem technologies (THz MSTs) and THz system-on-a-chip (THz SoC) and system-on-substrate (SiP).
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Phased array of switched-beam elements for handset adaptive antenna
(2007-08-28)
Tagapanij, Jukkrit
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Phongcharoenpanich, Chuwong
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Akkaraekthalin, Prayoot
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Krairiksh, Monai
The objective of this work is to develop a handset adaptive antenna for operation at the frequency of 5.8 GHz. This antenna must be compact and have fast convergence. A phased array of switched beam elements is introduced to speed up initialization of CMA. Using dual-feed switched-beam patch antennas, the antenna system can be compact. An array element has dimension of 15.5×15.5 mm<sup>2</sup> and the array radius of 15.5 mm. Hence, the antenna dimension is 46.5×46.5 mm<sup>2</sup> which is sufficiently small to install on a handset. ©2007 IEEE.
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Signal-to-interference ratio improvement by using a phased array antenna of switched-beam elements
(2005-05-01)
Ngamjanyaporn, Phaisan
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Phongcharoenpanich, Chuwong
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Akkaraekthalin, Prayoot
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Krairiksh, Monai
A phased array antenna of switched-beam elements is proposed to improve the signal-to-interference ratio (SIR). By using 1-bit phase shifters, the main beam of the array is switched to desired signal direction, and with the switched-beam patch antenna elements the null patterns are changeable. The results of radiation patterns show that the interference suppression can be improved. Moreover, the SIR measurement is also set up in multipath environment to ensure the array performance. It is found that the SIR is significantly affected by the multipath environment; however, the SIR improvement of more than 10 dB can be obtained by changing the null patterns. © 2005 IEEE.
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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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Circularly Polarized Omnidirectional Antenna with Dipole Core and Diagonally Adjoined Parasitic Braces for ISM Band Applications
(2019-01-01)
Dangkham, Piyapong
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Dentri, Sitthichai
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Phongcharoenpanich, Chuwong
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Akkaraekthalin, Prayoot
This research proposes a circularly polarized (CP) single-fed omnidirectional dipole antenna operable in 2.45 GHz frequency for the industrial, scientific, and medical (ISM) radio band applications. The proposed antenna consisted of bisectional dipole core, a pair of quarter-wave baluns, and four diagonally adjoined parasitic braces. The bisectional dipole core was utilized to improve the antenna gain and realize omnidirectional radiation pattern, and the quarter-wave baluns were to symmetrize the current on the bisectional core. The four parasitic braces collectively generated circular polarization. In the study, simulations were conducted using CST Microwave Studio and a prototype antenna fabricated. To validate, experiments were carried out, and simulation and experimental results compared. The finding revealed good agreement between the simulation and experimental results. Essentially, in addition to achieving an antenna gain of 2.07 dBic, the proposed CP single-fed omnidirectional antenna is suited to ISM frequency band applications.
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A radar-cross section of a passive tag on dielectric material in an RFID sensor application
(2015-08-17)
Suwalak, Rattapong
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Phongcharoenpanich, Chuwong
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Torrungrueng, Danai
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Akkaraekthalin, Prayoot
This paper is mainly present to a radar-cross section (RCS) of a passive tag in a radio frequency identification (RFID) sensor application. To determine qualities of a dielectric material under test (MUT) with a non-destructive testing (NDT) technique, a proposed meander-line dipole tag antenna is employed as a RFID sensor. The design and optimum parameters of the proposed RFID sensor are obtained using the CST Microwave Studio program. In this paper, instead of focusing on the scalar backscattered power based on the Friis transmission equation, we are also studying the RCS range equation to utilize for improve the accuracy of determination a qualities of MUT in a RFID sensor system. Simulated results show that the characteristics of the proposed RFID sensor such as the input impedance, antenna gain, power transmission coefficient and RCS.
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Deployable Wideband Circularly Polarized S-Band Antenna Array for CubeSat Applications
(2024-01-01)
Supreeyatitikul, Nathapat
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Akkaraekthalin, Prayoot
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Kawdungta, Supakit
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Phongcharoenpanich, Chuwong
A broadband circularly polarized (CP) S-band antenna array for CubeSat technology was proposed. The proposed CP antenna array comprised of 2 × 2 rectangular-shaped ring patches and sequentially rotated feeding structure. Besides, the sequentially rotated feeding structure is utilized to match impedance. This antenna is made of single-layered Roger RT5880 substrate. The simulation results at 2 GHz achieved IBW of 81% (1.3 - 2.92 GHz) and ARBW of 25% (1.85 - 2.35 GHz). The optimal RHCP gain is 4.69 dBic at 2.25 GHz. The half-power beamwidth at 2 GHz is 71.51°. The radiation patterns are RHCP characteristic. The proposed CP S-band antenna array with sequentially rotated feeding structure is deployed with the CubeSat platform, resulting in the proposed CP antenna array befitting CubeSat technology.
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Single-fed broadband CP bidirectional antenna with double-layer diagonally aligned plates for universal UHF-RFID applications
(2020-01-01)
Dentri, Sitthichai
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Pookkapund, Khanet
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Luadang, Bancha
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Akkaraekthalin, Prayoot
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Phongcharoenpanich, Chuwong
This research proposes a single-fed broadband circularly polarized (CP) bidirectional antenna operable in 840-960 MHz frequency band for readers of universal UHF-RFID applications. The proposed antenna is comprised of upper-layer conductor, lower-layer conductor, and wall patches. The upper-layer conductor consists of two diagonally aligned rectangular copper plates with a feeding gap at the center, and the lower-layer conductor is of two diagonally adjoined rectangular plates. The upper- and lower-layer conductors are adjoined with the wall patches. The diagonal alignment technique of the upper- and lower-layer plates was used to realize circular polarization and improve 3-dB axial ratio (AR) bandwidth. The double layers were deployed to improve impedance bandwidth (|S11| < -10 dB) and achieve bidirectional radiation pattern. The simulated impedance bandwidth and 3-dB AR bandwidth were 772.19-1014.6 MHz (27.13%) and 675-1000 MHz (38.80%), and the corresponding measured results were 759-1011 MHz (28.47%) and 648-1110 MHz (52.55%). The simulated LHCP/RHCP half-power beamwidth (HPBW), 3-dB AR beamwidth, and gain were 56° - 90°/54° - 92°, 60° - 104°, and 4.94 - 5.89 dBic, while the corresponding measured results were 52° - 98°/62° - 97°, 96° - 126°, and 4.28 - 5.72 dBic. As a result, the single-fed broadband CP bidirectional antenna is applicable to universal UHF-RFID readers. Besides, the novelty of this research lies in the use of diagonal alignment of conducting plates to achieve circular polarization and wider AR bandwidth.
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Curved meander line resonators for chipless RFID sensors
(2019-09-01)
Suwalak, Rattapong
;
Phongcharoenpanich, Chuwong
;
Akkaraekthalin, Prayoot
;
Torrungrueng, Danai
This paper presents a chipless RFID sensor based on the curved meander line resonator. The sensor is designed and printed on Fr4-substrate with thickness of 0.8 mm. The resonator on the RFID sensor acts as a data bit for identification, where we use only one bit in this paper for illustration. Transmitting and receiving antennas on the RFID sensor are properly designed to sense the dielectric property of the material under test. From the results, it can operate from 1.8-2.5 GHz. The gain is 2.14 dBi at the resonant frequency of 2.28 GHz. Therefore, it can be candidate as a RFID sensor with a nondestructive testing technique.

Phongcharoenpanich, Chuwong

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