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Design of a Circular Patch Antenna with Parasitic Elements for 5G Applications
(2023-09-01)
Lamultree, S.
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Phalla, M.
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Kunkritthanachai, P.
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Phongcharoenpanich, C.
A design of a wideband bidirectional pattern antenna, accomplished by the integration of a circular patch, crescents as parasitic elements, encompassed by a circular ring adjoining the ground plane, to operate over the mid-band 5G sub-6 GHz applications is reported. It is come up with a copper grazed on FR4 substrate with relative permittivity of 4.3 and height of 1.6 mm. The proposed antenna is fed by a 50-ohm coplanar waveguide, which is printed on the same side of the radiating circular patch. A concise antenna model with dimensions of 45 × 45 × 0.6 mm<sup>3</sup> was made up and investigated to affirm the simulation outcomes. Good consistency was confirmed between experimental and simulation results. The proposed antenna has the benefit of bidirectional pattern with a good gain of 5.24 dBi and wide bandwidth covering of 111.4% (1.81-6.36 GHz) — it is one of good postulants for 5G new radiation application especially for indoor environment, narrow, and long path services area like corridor, tunnel, and train station, etc.
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A Conical Beam Antenna Using a Monopole Wire and Rectangular Copper Probe with Four Parasitic Sleeves for UMTS/WLAN Applications
(2022-01-01)
Nuangwongsa, K.
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Wongsiritorn, P.
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Sukkamat, R.
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Phongcharoenpanich, C.
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Pumpoung, T.
This paper aimed to present a wideband monopole antenna for base station applications of indoor reception for UMTS (B1) and WLAN (IEEE 802.11b) systems. The operating frequency was ranged from 1.92 GHz to 2.5 GHz. The proposed antenna was made up of a probe and four connecting parasitic sleeves from the upper copper circular patch to the ground. The rectangular probe structure technique was used to extend the frequency band and effectively improve the matching conditions. The results from simulation and measurement showed that the presented antenna had a proper matching impedance of |S11| (dB) lower than -10 dB in the frequency band from 1.71 GHz to 3.72 GHz and also from 1.58 GHz to 2.98 GHz, respectively. The percentage of bandwidth was 74.03% and 61.40%, respectively. The antenna had a conical radiation pattern. The simulated and measured gains were 2.93 dBi to 3.6 dBi and 2.58 dBi to 3.54 dBi, respectively.
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Non-destructive determination of coconut oil using microwave dielectric constant sensing
(2019-01-01)
Suwalak, R.
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Phongcharoenpanich, C.
Coconut oil demand for food, medical and cosmetic uses is increasing. Analyses of quality using non-destructive tools would be useful, and therefore, wireless sensing using high frequency to determine the percentage of coconut oil has been tested. The proposed sensing is based on the wireless power transmission and the penetration of the ultrahigh frequency wave. The system operates with the microwave transceiver that generates wireless power and receives the backscatter power from a sensor placed on a coconut. A transceiver at microwave frequency of 920-925 MHz with low power level was used to avoid affecting coconut quality. Wireless microwave dielectric constant sensing was used with reasonable accuracy to determine the percentage of the coconut oil.
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Analysis of a Sensor using Rician k-factor for Identification of a Spherical Conductor Submerged in Soil
(2018-07-02)
Yoiyod, P.
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Pathoumvanh, S.
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Phongcharoenpanich, C.
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Krairiksh, M.
The Unexploded Ordnance (UXO) problem is a barrier plaguing for the country's development since the UXO contamination can render lands unusable. The UXO is defined as a metallic material submerged into the soil. Generally, the clearance team uses a handheld metal detector for scanning sub-surface and sensing the location of such a bomb. This outdated method is labor intensive and time consuming when scanning in the large area. Hence, the high-speed and lightweight scanning system for sensing underground object is desired. This paper investigated a feasibility to develop a Ground Penetrating Radar (GPR) system that can detect metallic bombs which is submerged in soil at the depth of 30 cm from the surface. The scattered waves from an object were calculated at different positions and the Rician k-factor was estimated from the ratio of mean to variance. The position with highest k-factor indicates the location of the target UXO.
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A triple-band printed microwave absorber for WLAN/WiMAX applications
(2017-10-19)
Khoomwong, E.
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Soemphol, C.
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Phongcharoenpanich, C.
This paper presents a triple-band printed-circuitboard microwave absorber for applications in 2.4GHz WLAN and 3.5/5.8GHz WiMAX bands. The absorber consists of simple geometries with tuning elements and chamfering, which can significantly reduce the modeling errors. The study and design processes are based on numerical simulations. The simulated results show the absorption bandwidths (at 50%) of 160MHz (2.36-2.52GHz), 160MHz (3.48-3.64GHz) and 520MHz (5.54- 6.06GHz). The absorptions at the center frequency of each band (i.e. 2.45, 3.55 and 5.78GHz) are also found feasible at 97.6%, 85.2% and 96.0%, respectively. From the study, the proposed absorber is applicable for a fairly wide-Angle of wave incidence and suitable for a number of applications in the specified bands. The main advantages of the proposed absorber are thin, simple and low-cost structure, which can be very useful for various applications in WLAN and WiMAX bands.
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Detecting granulated fruit by measuring dual-frequency back scattered waves
(2017-07-02)
Kittiyanpunya, C.
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Phongcharoenpanich, C.
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Krairiksh, M.
Granulation is a kind of defection in fruits that must be non-destructively detected. Electromagnetic wave measurement is a feasible technique for in-situ measurement. With thick peel, it is necessary to eliminate the effect of peel so that sole effect of variation of pulp can be detected. This paper presents the simulated scattering coefficient from fruit with dual-frequency that exhibits more obvious results than the single-frequency measurement. The results lead to the appropriate design of a sensor for granulation detection.
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Wideband dipole antenna array for digital TV broadcasting applications
(2016-11-07)
Keowsawat, P.
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Osklang, P.
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Kanahna, R.
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Phongcharoenpanich, C.
This research has proposed a planar rectangular dipole antenna enclosed in double C-shaped parasitically slit elements (i.e. radiator element) on a double-cornered reflector for bandwidth enhancement. The gain was enhanced by the subsequent deployment of multiple radiator elements to fabricate a four-element vertically array antenna on an elongated double-cornered reflector. The simulated and measured /S<inf>11</inf>/<-10dB of the array antenna respectively covered the 410-991MHz (82.9%) and 415-886MHz (72.4%) frequency ranges. The proposed array antenna radiates unidirectionally across the DTV frequency band with a measured front-to-back ratio and cross polarization <20dB and >-23dB, respectively. The simulated and measured gains of the array antenna were 12.8-16.4dBi and 11.3-15.8dBi along the 470-862MHz frequency range. This proposed array antenna is thus suitable for DTV broadcasting transmission.
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Circularly polarized unidirectional antenna using planar tennis shape structure
(2015-10-16)
Phongcharoenpanich, C.
;
Boonying, K.
This paper presents the study and the design of the circularly polarized reader antenna with a tennis ball-shaped radiating plate operating at the universal UHF band (860-960 MHz). The proposed antenna is excited by a capacitively coupled feed technique to enhance S<inf>11</inf>. The tennis ball-shaped radiating plate can be generated a circularly polarized radiation. The simulation is studied effect of the parameters of the proposed antenna for cover the universal UHF RFID band. The prototype antenna is achieved, S<inf>11</inf> cover the frequency between 837.60 to 966.20 MHz, the 3-dB axial ratio (AR) bandwidth cover the frequency from 850.60 to 963.50 MHz, a unidirectional radiation pattern and an average gain 6.18 dBic, respectively.
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Polarization switchable flat antenna for WLAN applications
(2014-01-01)
Phongcharoenpanich, C.
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Boonying, K.
Polarization switchable flat antenna for WLAN applications operated at the center frequency of 2.45 GHz. The proposed antenna consists of the square flat structure, three switches (six P-I-N diodes), transmission-line phase shifters of 0 and 90 degrees. The antenna can be switched between 5 different states: vertical, horizontal and slant polarizations for linear polarization (LP), left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP) by controlling the DC bias of 5 V and the current of 16 mA for the P-I-N diodes. The simulated and measured results show that the proposed antenna can cover the impedance bandwidth from 2.400 GHz to 2.484 GHz and good axial ratio for the circular polarization.
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Dual-polarized flat rectenna for 2.45 GHz
(2013-01-01)
Phongcharoenpanich, C.
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Boonying, K.
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Kosulvit, S.
This paper presents the study and the design of the rectenna (antenna integrated with rectifying circuit) operating at the WLAN band of 2.45 GHz. The polarization diversity antenna fed by two linear electric probes is chosen for receiving RF power from the WLAN. The isolation of the proposed polarization diversity antenna is improved by inserting an annular rectangular-ring slot on the radiating plate. The obtained result of isolation the antenna is higher than 30 dB. The Experimental of the characteristics radiation patterns are obtained the cross polarization level lower than is 20 dB, a unidirectional beam and a maximum gain is higher than 7 dBi. The rectifying circuit is used voltage double diode with open stub matching circuit. The results of rectifying circuit found that the DC power is higher than 100 mV at -20 dBm. The measured results of the rectenna is the RF power to DC power conversion at the distance less than 1 m. © 2013 IEEE.

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