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Gain Enhancement of a Dual-Band S-Patch Antenna Array for 5G Application
(2025-04-01)
Udomratanasiri, Dhanapon
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Kawdungta, Supakit
;
Pansomboon, Rassamitut
;
Lang, Alongkorn
;
Phongcharoenpanich, Chuwong
This paper proposes the dual-band S-patch antenna with gain enhancement by using the planar array configuration and dielectric superstrate. The design of the proposed antenna is focused on the base station antenna in the 5G frequency bands n41 (2.6 GHz) and n78 (3.5 GHz). The dual-band S-patch antenna is arranged in the 2 × 6 elements planar array antenna and the FR4 dielectric superstrate is on the top of the array. The simulated results indicated that the operating frequency of 2.55–2.65 GHz and 3.46–3.61 GHz with uni-directional radiation pattern. The antenna gain can be improved with 18.70 dBi at 2.6 GHz and 19.30 dBi at 3.5 GHz. The prototype antenna is fabricated and the measured results are in good agreement. With the simple design of the proposed antenna, it would be useful for the installation of the base station antenna.
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High-Gain Dual-Band Reverse S-Patch Antenna Scheme for 5G Mobile Base Stations
(2025-01-01)
Udomratanasiri, Dhanapon
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Kawdungta, Supakit
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Pansomboon, Rassamitut
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Lertwiriyaprapa, Titipong
;
Phongcharoenpanich, Chuwong
This paper proposes a low-profile high-gain dual-band reverse S-patch antenna scheme that supports fifth-generation (5G) frequency bands for mobile base stations. In the antenna design, a reverse S-shaped radiation patch is used to achieve resonant at 2.6 GHz and 3.5 GHz, and an FR4 dielectric superstrate is included to enhance the antenna gain. The results show that the proposed reverse S-patch antenna scheme with dielectric superstate resonates at both target frequencies, covering 2.57-2.62 GHz and 3.46-3.55 GHz with unidirectional radiation pattern. The measured antenna gain are 5.0 dBi at 2.6 GHz and 4.0 dBi at 3.5 GHz. In essence, the proposed antenna scheme can be further developed into an array antenna with enhanced gain for 5G mobile base stations. The novelty of this research lies in the use of FR4 dielectric superstrate to enhance the antenna gain.
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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
;
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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Compact High-Gain Dual-band Patch Antenna With Dielectric Superstrate for Wi-Fi 6 Applications
(2023-01-01)
Muangrung, Bhuwakorndit
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Lang, Alongkorn
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Torrungrueng, Danai
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Phongcharoenpanich, Chuwong
;
Kawdungta, Supakit
The compact high-gain dual-band double circular patch antenna with dielectric superstrate is introduced for Wi-Fi 6 applications. The double circular patch antenna can be operated at two frequency bands of 2.41-2.54 GHz and 4.94-6.03 GHz. The dielectric superstrate and parasitic patches are employed in front of the antenna to enhance the antenna gain. From simulated results, the dielectric superstrate and parasitic patches can improve the antenna gain. The proposed antenna has |S11| less than-10 dB in both operating frequency bands, unidirectional radiation pattern, and gain of 4.8 dBi at 2.45 GHz and 4.57 dBi at 5.5 GHz.
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Mics/ism meander-line microstrip antenna encapsulated in oblong-shaped pod for gastrointestinal tract diagnosis
(2021-06-01)
Kawdungta, Supakit
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Boonpoonga, Akkarat
;
Phongcharoenpanich, Chuwong
In light of the growth in demand for multiband antennas for medical applications, this research proposes a MICS/ISM meander-line microstrip antenna encapsulated in an oblong-shaped pod for use in diagnoses of the gastrointestinal tract. The proposed antenna is operable in the Medical Implant Communication System (MICS) and the Industrial, Scientific and Medical (ISM) bands. The antenna structure consists of a meander-line radiating patch, a flipped-L defected ground plane, and a loading resistor for antenna miniaturization. The MICS/ISM microstrip antenna encapsulated in an oblong-shaped pod was simulated in various lossy-material environments. In addition, the specific absorption rate (SAR) was calculated and compared against the IEEE C95.1 standard. For verification, an antenna prototype was fabricated and experiments carried out in equivalent liquid mixtures, the dielectric constants of which resembled human tissue. The measured impedance bandwidths (|S11| ≤ −10 dB) for the MICS and ISM bands were 398–407 MHz and 2.41– 2.48 GHz. The measured antenna gains were −38 dBi and −13 dBi, with a quasi-omnidirectional radiation pattern. The measured SAR was substantially below the maximum safety limits. As a result, the described MICS/ISM microstrip antenna encapsulated in an oblong-shaped pod can be used for real-time gastrointestinal tract diagnosis. The novelty of this work lies in the use of a meander-line microstrip, flipped-L defected ground plane, and loading resistor to miniaturize the antenna and realize the MICS and ISM bands.
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Design of antenna arrays by using modified fruit fly optimization algorithm
(2021-05-19)
Kawdungta, Supakit
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Torrungrueng, Danai
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Lang, Alongkorn
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Phongcharoenpanich, Chuwong
This research paper proposed the modified fruit fly optimization algorithm (MFOA) to design antenna arrays. The MFOA is used to estimate parameters of three configurations of antenna arrays. There are linear, planar and circular uniform antenna arrays. From numerical results, the MFOA is effective in determining antenna array parameters. The proposed algorithm has advantages in easy implementation, global search space and fast convergence rate.
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Switched Beam Multi-Element Circular Array Antenna Schemes for 2D Single-Anchor Indoor Positioning Applications
(2021-01-01)
Kawdungta, Rattiya
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Kawdungta, Supakit
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Torrungrueng, Danai
;
Phongcharoenpanich, Chuwong
This research investigates four switched-beam multi-element circular array antenna schemes operating at 2.4-2.5 GHz for two-dimensional (2D) single-anchor indoor positioning applications. The realization of the proposed antenna schemes involved two evolutionary stages: rectangular microstrip antenna with dielectric superstrate (i.e., element) and multi-element circular array antenna with radio frequency (RF) switch network. The number of elements of circular array antennas was varied between 4, 5, 6, and 8 elements. Multiple signal classification (MUSIC) algorithm was used to determine the direction of incoming signal and Friis transmission equation to estimate the transmission distance. Simulations were carried out, and results showed that the rectangular microstrip antenna with dielectric superstrate (one single element) achieved impedance matching (vert S-{11}vert < -10,,text {dB}) in the frequency range of 2.4-2.5 GHz, with unidirectional radiation pattern and 6.65 dBi antenna gain. In addition, four-, five-, six-, and eight-element circular array antenna prototypes were fabricated and experiments carried out in an indoor environment with two, three, and four incoming signals. The experimental results indicated that the eight-element circular array antenna could be deployed to reliably determine signal direction and distance, particularly for indoor localization with two incoming signals. The novelty of this work lies in the potential use of switched-beam multi-element circular array antenna schemes in place of conventional adaptive array antennas for 2D indoor localization. Compared with the conventional adaptive array antennas, the proposed multi-element circular array antenna schemes are relatively low-cost and easy to fabricate.
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Circularly polarized reconfigurable microstrip loop antenna using parasitic patches and PIN diodes
(2020-07-01)
Kawdungta, Supakit
;
Phongcharoenpanich, Chuwong
This research proposes a novel circularly polarized (CP) reconfigurable microstrip loop antenna for 2.4-2.5 GHz advanced wireless communication using two parasitic patches and two PIN diodes. The reconfigurable antenna can alternate between right hand circular polarization (RHCP) and left hand circular polarization (LHCP) at the main beam by manipulating the ON/OFF status of the PIN diodes. Simulations were carried out for the optimal antenna parameters, and an antenna prototype was fabricated and experiments were undertaken. The simulation and measured results are in good agreement. The antenna achieves an impedance bandwidth of 2.4-2.5 GHz and unidirectional radiation pattern with a maximum gain of 5 dBic and 3-dB axial ratio for both RHCP and LHCP. As a result, the proposed reconfigurable antenna could be utilized to improve wireless communication performance. In essence, the novelty of this research lies in the utilization of parasitic patches and shorted PIN diodes to transform linear to circular polarization; and the reconfigurability of polarization between RHCP and LHCP.
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Compact asymmetrical patch dipole antenna for indoor digital terrestrial television reception
(2017-12-19)
Bangkaew, Naruedom
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Wunnaleart, Rapee
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Kawdungta, Supakit
;
Phongcharoenpanich, Chuwong
This paper presents the compact asymmetrical patch dipole antenna for digital terrestrial television reception in indoor environment. It can be operated in the frequency of 430-980 MHz. The antenna structure is a patch designed on a rectangular printed circuit board (PCB). The patch is cut as asymmetrical planar dipole as the radiating element on the FR4 substrate that is appropriated for indoor application. The proposed antenna is designed based on the 75 Ohm standard, and it is simulated using CST microwave studio. From the simulated and measured results, it is found that the proposed antenna has S<inf>11</inf> less than-10 dB over the frequency of 430-980 MHz and omni-directional radiation pattern with a gain of 2 dBi. It can be efficiently used in digital terrestrial television.
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Superstrate-integrated switchable beam rectangular microstrip antenna for gain enhancement
(2017-06-01)
Kawdungta, Supakit
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Jaibanauem, Puwanai
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Pongga, Rattiya
;
Phongcharoenpanich, Chuwong
This research has proposed a switchable beam rectangular microstrip antenna with double parasitic patches, in which two PIN diodes were deployed for manipulation of the main beam direction and a superstrate (i.e. Either a dielectric slab or metamaterial) for enhancement of the antenna gain. The dielectric slab is a second FR4 substrate while the metamaterial (MTM) is the 7 × 17 periodic structure of planar cycloid dipoles (PCD). Simulations were carried out and three different antenna prototypes (i.e. The proposed switchable beam rectangular microstrip antenna, the proposed antenna either with dielectric slab or MTM) fabricated and experimented. The simulation and experimental results are in good agreement and exhibit good impedance matching (|S<inf>11</inf>| <-10 dB) along the operating frequency. The average measured gain is 7 dBi with the unidirectional radiation pattern along the operating frequency. The proposed switchable antennas with and without the superstrate are operable in the 2.4-2.5 GHz WLAN system and switchable in three directions of 0°, 30° and 330° (xy-plane). Moreover, the findings validate the applicability of either the dielectric slab or three MTM block-layers as the superstrate to improve the antenna gain.

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