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Artificial Magnetic Conductor as Planar Antenna for 5G Evolution
(2023-01-01)
Kanjanasit, Komsan
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Osklang, Pracha
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Jariyanorawiss, Terapass
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Boonpoonga, Akkarat
;
Phongcharoenpanich, Chuwong
A 5G wireless system requests a high-performance compact antenna device. This research work aims to report the characterization and verification of the artificial magnetic conductor (AMC) metamaterial for a high-gain planar antenna. The configuration is formed by a double-side structure on an intrinsic dielectric slab. The 2-D periodic pattern as an impedance surface is mounted on the top surface, whereas at the bottom surface the ground plane with an inductive narrow aperture source is embedded. The characteristic of the resonant transmission is illustrated based on the electromagnetic virtual object of the AMC resonant structure to reveal the unique property of a magnetic material response. The characteristics of the AMC metamaterial and the planar antenna synthesis are investigated and verified by experiment using a low-cost FR4 dielectric material. The directional antenna gain is obviously enhanced by guiding a primary field radiation. The loss effect in a dielectric slab is essentially studied having an influence on antenna radiation. The verification shows a peak of the antenna gain around 9.7 dB at broadside which is improved by 6.2 dB in comparison with the primary aperture antenna without the AMC structure. The thin antenna profile of λ/37.5 is achieved at 10 GHz for 5G evolution. The emission property in an AMC structure herein contributes to the development of a low-profile and high-gain planar antenna for a compact wireless component.
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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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Triband compact printed antenna for 2.4/3.5/5 GHz WLAN/WiMAX applications
(2019-01-01)
Osklang, Pracha
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Phongcharoenpanich, Chuwong
;
Akkaraekthalin, Prayoot
This research presents a triband compact printed antenna for WLAN and WiMAX applications. The antenna structure consists of a folded open stub, long and short L-shaped strips, and asymmetric trapezoid ground plane. Besides, it is of simple structure and operable in 2.4 GHz and 5 GHz (5.2/5.8 GHz) WLAN and 3.5/5.5 GHz WiMAX bands. The folded open stub and long and short L-shaped strips realize impedance matching at 2.4, 3.5, 5.2, and 5.8 GHz, and the asymmetric trapezoid ground plane fine-tunes impedance matching at 5.2, 5.5, and 5.8 GHz. In addition, the equivalent circuit model consolidated into lumped elements is also presented to explain its impedance matching characteristics. In this study, simulations were carried out, and a prototype antenna was fabricated and experimented. The simulation and experimental results are in good agreement. Specifically, the simulated and experimental radiation patterns are omnidirectional at 2.4, 3.5, and 5.2 GHz and near-omnidirectional at 5.5 and 5.8 GHz. Furthermore, the simulated and measured antenna gains are 1.269-3.074 dBi and 1.10-2.80 dBi, respectively. Essentially, the triband compact printed antenna covers 2.4 GHz and 5 GHz (5.2/5.8 GHz) WLAN and 3.5/5.5 GHz WiMAX frequency bands and thereby is a good candidate for WLAN/WiMAX applications.
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Electromagnetic Design Considerations of Wideband Radome for Antenna Array of Digital Television Broadcasting Transmission
(2018-07-02)
Dentri, Sitthichai
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Osklang, Pracha
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Luadang, Bancha
;
Phongcharoenpanich, Chuwong
The electromagnetic properties are considered for the radome design of the wideband application in digital television (DTV) antenna array used for broadcasting transmission. The manufactured material with associated geometry is appropriately chosen to achieve the optimum radiation performances. The radome design guidelines for the wideband DTV antenna array of the broadcasting transmission are provided. The presented information is significant for DTV antenna array of future development.
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Broadband planar dipole array Antenna with double C-shaped slit elements for digital TV broadcasting transmission
(2016-06-01)
Osklang, Pracha
;
Phongcharoenpanich, Chuwong
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. In the study, simulations were first carried out to determine the optimal parameters of the radiator element and then a radiator element prototype was fabricated and mounted onto a double-cornered aluminum reflector. The simulated and measured |S<inf>11</inf>|<–10 dB of the antenna element covered the frequency ranges of 451–901 MHz (66.6%) and 455–886 MHz (64.3%), respectively. 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>|<−10 dB of the array antenna, respectively, covered the 410–991 MHz (82.9%) and 415–886 MHz (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 >20 and <−23 dB, respectively. The simulated and measured half-power beam widths in the E and H planes were respectively 56° ± 13° and 20° ± 6°; and 57° ± 13° and 21° ± 6°. In addition, the simulated and measured gains of the array antenna were 12.8–16.4 dBi and 11.3–15.8 dBi along the 470–862 MHz frequency range. This proposed array antenna is thus suitable for DTV broadcasting transmission. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:466–478, 2016.
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Horizontally polarized omnidirectional antenna using octagonal dipole array for digital television reception
(2015-04-22)
Osklang, Pracha
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Luadang, Bancha
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Phongcharoenpanich, Chuwong
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Lamultree, Suthasinee
This paper presents a horizontally polarized omnidirectional antenna using octagonal dipole array for digital television reception. The proposed antenna consists of stacked octagonal dipole array that is designed from brass sheet. The parametric study is carried out for different dimensions of distance between octagonal dipole, dipole arm and radiator to improve the impedance bandwidth. Obvious that the results show good impedance matching of S<inf>11</inf>better than 10 dB, and antenna gain of 1.1 dBi-2.3 dBi along the frequency range from 470 MHz to 862 MHz.

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