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Dual-Band CP Metasurface-Array Antenna with Sequential-Phase Feed Network for C-Band Operation
(2026-01-01)
Kakhong, Khwanlada
;
Phaebua, Kittisak
;
Phongcharoenpanich, Chuwong
;
Supreeyatitikul, Nathapat
This paper presents a four-cluster dual-band circularly polarized (CP) metasurface (MTS)-array antenna integrated with a sequential-phase feed (SPF) network for C-band applications. The antenna is implemented on dual-layer FR-4 substrates, incorporating both big- and small-sized MTS-array elements per cluster, with a tilted square-slot ground plane and microstrip-line feed. The SPF network excites each cluster with equal amplitude and 90<sup>°</sup> phase shifts, significantly enhancing return loss bandwidth (RLBW), axial ratio bandwidth, and realized gain. The simulated results demonstrate RLBW of 3.08 - 4.51 GHz and 4.94 - 8 GHz, and ARBWs of 3.08 - 4.66 GHz and 5.27 - 6.42 GHz for the lower and higher operating bands, respectively. The corresponding highest RHCP gains are 6.15 dBic at 3.8 GHz and 4 dBic at 6 GHz. The proposed antenna design achieves bi-directional radiation patterns and shows substantial performance improvements over conventional dual-band CP MTS-array antennas.
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Prism-Shaped Dielectric Resonator Circularly Polarized Antenna with Loop-Shaped Metasurface-Enhanced Reflector
(2025-01-01)
Supreeyatitikul, Nathapat
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Lertwiriyaprapa, Titipong
;
Phongcharoenpanich, Chuwong
;
Konpang, Jessada
This paper proposes a prism-shaped dielectric resonator (DR) -based antenna with circularly polarized (CP) characteristics for C-band wireless systems. This antenna comprised a prism-shaped DR and single-layer substrate. The prism-shaped DR is on the upper-side substrate. Besides, a rod-shaped probe was plugged into a DR and connected by an SMA connector on the lower-side substrate. A loop-shaped metasurface-enhanced reflector is employed to improve bandwidth (i.e., RLBW and ARBW) and antenna gain. A regularly spaced array of 7 × 7 loop-shaped metasurface unit structures is positioned on the upper substrate side. The simulation RLBW and ARBW results at 5.8 GHz (center frequency) are 34% (5.22 - 7.2 GHz) and 16% (5.27 - 6.2 GHz). This antenna radiates left-hand circular polarization with an optimal maximum gain at 5.5 GHz of 6.7 dBic, making it suitable for C-band wireless networks.
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Broadband Two-Array Metasurface-Gridded MIMO Antenna with Dual-CP Bi-Directional Capabilities
(2025-01-01)
Supreeyatitikul, Nathapat
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Kakhong, Khwanlada
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Prasong, Pusit
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Phongcharoenpanich, Chuwong
;
Konpang, Jessada
This study presents a novel two-array MTS-gridded MIMO antenna with dual circular polarization (CP) bidirectional capabilities for full-duplex communications. The proposed antenna consists of two mirrored clusters, each comprising a single-element antenna formed by a 3 × 4 MTS-gridded element array, a circular patch, and a ground plane. The antenna demonstrates a wide measured return loss bandwidth (RLBW) of 56.46% (5 - 8.67 GHz), axial ratio bandwidth (ARBW) of 18.15% (6.26 - 7.44 GHz), and strong isolation below -22 dB. Peak gains of 6.5 dBic and 6.55 dBic were observed at 6.6 GHz and 6.54 GHz for Ports 1 and 2, respectively. Furthermore, the low envelope correlation coefficient (< 0.005) and high diversity gain (> 9.985 dB) validate its effectiveness for multi-port applications. The bidirectional radiation pattern and dual circular polarization support simultaneous transmission and reception, making the design well-suited for full-duplex MIMO operation.
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Metasurface-Based Wideband CP Antenna Array Using Hybrid Coupler for 5G Mid-band Applications
(2023-01-01)
Supreeyatitikul, Nathapat
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Lertwiriyaprapa, Titipong
;
Phongcharoenpanich, Chuwong
This paper proposes the lemon-shaped metasurface (MTS)-based wideband circularly polarized (CP) antenna array using hybrid coupler for mid-band wireless communications. The proposed MTS-based CP antenna array includes two-stack layers of FR-4 substrate: upper-stack and lower-stack substrates. The upper-stack substrate contains quadri clusters of 4 × 4 MTS cells. The lower-stack substrate consisted of four slots as the ground plane and hybrid couple as the feed network. Besides, the MTS elements and hybrid couple feed network function as polarization conversion. The proposed MTS-based CP antenna array for 5G mid-band spectrum (center frequency at 4 GHz) achieves simulated IBW of 41.25% (3.35-5 GHz) and ARBW of 21.25% (3.68-4.53 GHz). The simulated maximum gain at 3.9 GHz is 9.1 dBic. The radiation characteristic is right-hand circular polarization radiation.
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CMA-Based Metasurface-Based Circularly Polarized Patch Antenna for SATCOM Applications
(2023-01-01)
Supreeyatitikul, Nathapat
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Lertwiriyaprapa, Titipong
;
Phongcharoenpanich, Chuwong
This paper proposes the metasurface (MTS)based circularly polarized (CP) stacked-patch antenna for satellite wireless communications. The characteristic mode analysis (CMA) was utilized to characterize the antenna configuration. The proposed antenna consisted of three-layer FR-4 substrates. The upper-layer substrate contained cross-shaped structure of a periodic MTS unit cells. The middle- and lower-layer substrates consisted of cross-slot ground plane and sequentially-rotated microstrip feed line, respectively. The cross-shaped structure of MTS unit cells evolved from the 4 $\times$ 4 periodic square-shaped conventional MTS unit cells for impedance bandwidth improvement. Besides, the cross-slot ground plane with sequentially-rotated microstrip feed line generated the two orthogonal modes at 5 GHz and 5.3 GHz for CP radiation. The simulated IBW and ARBW at 5 GHz (center frequency) were 29.8% (4.8-6.29 GHz) and 12% (4.8-5.4 GHz). The maximum gain at 5.4 GHz was 5.8 dBic. The radiation characteristic was left-hand circular polarization.
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CMA of Wideband Circularly Polarized Metasurface Antenna for 5G Wireless Technology
(2023-01-01)
Supreeyatitikul, Nathapat
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Keowsawat, Panisa
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Kanahna, Rachen
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Lertwiriyaprapa, Titipong
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Phongcharoenpanich, Chuwong
This paper proposes a compact circularly polarized (CP) metasurface (MTS) antenna for 5G wireless communications. The characteristic mode analysis (CMA) is utilized to characterize the antenna structure. The proposed CP MTS antenna consisted of two substrate layers of FR-4 type. The upper substrate layer contained multi-shaped MTS cells. The lower substrate layer functioned as an aperture-coupled feed. The evolution of the proposed CP MTS antenna comprised of four stages: MTS-1 (conventional MTS scheme), MTS-2, MTS-3, and MTS-4 (proposed antenna). The conventional MTS scheme generated the two MS modes (Modes 1 and 2) with orthogonal surface current and radiations. Besides, the surface current of Modes 3 and 4 is traveled along the edges of the conventional MTS scheme. To eliminate those surface currents, the multi-shaped is utilized which sits around the conventional MTS scheme (MTS-2, 3, and 4). When an aperture-coupled feed is applied, the ARBW of the MTS-1 is improved. The simulated IBW and ARBW at 3.5 GHz (center frequency) are 43.4% (3.4-4.92 GHz) and 37.14% (3.28-4.58), respectively. The maximum gain is 7.25 dBic at 3.6 GHz. The radiation characteristic is right-hand circular polarization, rendering the proposed CP MTS antenna reasonable for 5G technology.
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Non-Uniform Metasurface-Based Omnidirectional Patch Antenna Using Characteristic Mode Analysis
(2023-01-01)
Supreeyatitikul, Nathapat
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Chudpooti, Nonchanutt
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Phongcharoenpanich, Chuwong
This paper proposes a non-uniform metasurface (MTS) omnidirectional patch antenna for WLAN applications. The antenna configuration is characterized by using characteristic mode analysis (CMA). The proposed non-uniform MTS-based patch antenna comprised a single-layer FR-4 substrate. Non-uniform square-shaped MTS unit cells were present in the upper-substrate layer. The lower-substrate layer is a circular-shaped ground plane. Besides, the excitation method of the proposed non-uniform MTS-based antenna is a single-probe-fed method. The use of a non-uniform square-shaped MTS structure achieved wide frequency resonance, resulting in wide impedance bandwidth. In addition, the circularly rotated direction of current distributions and magnetic fields on the non-uniform MTS structure can generate omnidirectional radiation by Mode 1 at 2.4 GHz (center frequency). The simulated IBW at 2.4 GHz is 26.67% (2.26 - 2.9 GHz). The optimum gain is 4.13 dBic at 2.8 GHz. The proposed antenna exhibits omni-directional radiation characteristics, making it well-suited for wireless communication applications.
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High-Gain Wideband CP S-shaped Slot Antenna with Metasurface Reflector for UHF-RFID Readers
(2022-01-01)
Supreeyatitikul, Nathapat
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Boonpoonga, Akkarat
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Phongcharoenpanich, Chuwong
This research proposes a high-gain wideband circularly polarized (CP) S-shaped slot antenna with metasurface (MTS) reflector for UHF-RFID handheld readers. The proposed antenna consisted of the S-shaped slot antenna with coplanar waveguide feed on the upper substrate and 4 × 4 periodically-arranged plus-sign-shaped slot MTS unit cells on the lower substrate functioning as a reflector. The MTS reflector was utilized to realize the high-gain of the CP S-shaped slot antenna. To achieve wide impedance bandwidth (IBW) and axial ratio bandwidth (ARBW), the evolution of the antenna was developed in four stages. The simulated IBW and ARBW of the Antenna IV (proposed antenna) at 0.9 GHz (center frequency) were 37.7% (0.66-1 GHz) and 27.7% (0.72-0.97 GHz), respectively. In addition, the maximum gain was 7.56 dBic at 0.78 GHz with left-hand circular polarization (LHCP) radiation characteristics. The dimension of the proposed antenna was 0.35?0 × 0.35?0 × 0.195?0.
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S-Shaped Metasurface-Based Wideband Circularly Polarized Patch Antenna for C-Band Applications
(2021-01-01)
Supreeyatitikul, Nathapat
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Lertwiriyaprapa, Titipong
;
Phongcharoenpanich, Chuwong
This research proposed an S-shaped metasurface (MTS)-based wideband circularly polarized (CP) patch antenna for C-band uplink frequency spectrum. The proposed MTS-based CP patch antenna was of low profile and fabricated on three substrate layers: upper, middle, and lower. The upper substrate contained 4×4 periodic S-shaped MTS elements, the middle substrate functioned as ground plane with a rectangular-shaped slot at the center, and the lower substrate contained a coplanar waveguide with microstrip and ground. The S-shaped MTS elements converted linearly polarized (LP) into CP wave. Simulations were performed, and an antenna prototype was fabricated and experiments carried out. The measured impedance bandwidth and axial ratio bandwidth (ARBW) at the center frequency of 5.9 GHz were 43.22% (4.05-6.6 GHz) and 22% (5.3-6.6 GHz), respectively, rendering the proposed antenna suitable for satellite communication applications. The proposed antenna achieved the maximum gain of 6.16 dBic at 5.6 GHz. The novelty of this research lies in the use of S-shaped MTS elements to efficiently convert LP into CP wave and achieve wider ARBW for the C-band uplink spectrum.
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Quadri-Cluster Broadband Circularly-Polarized Sequentially-Rotated Metasurface-Based Antenna Array for C-Band Satellite Communications
(2021-01-01)
Supreeyatitikul, Nathapat
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Torrungrueng, Danai
;
Phongcharoenpanich, Chuwong
This research proposes a compact quadri-cluster broadband circularly polarized (CP) sequentially-rotated metasurface-based (MTS) antenna array for the C-band frequency spectrum. One cluster of the quadri-cluster MTS-based antenna array consisted of 4 times 4 S-shaped periodically-arranged MTS elements. The sequentially-rotated feed network was utilized to realize circular polarization and improve the impedance bandwidth (IBW), 3-dB axial ratio bandwidth (ARBW) and 3-dB boresight gain bandwidth of the quadri-cluster MTS-based antenna array. Simulations were performed and results were compared with experiments. The measured IBW and ARBW were 84.74% (4.0-9.0 GHz) and 57.6% (4.2-7.6 GHz) at the center frequency of 5.9 GHz, rendering the proposed quadri-cluster MTS-based antenna array suitable for satellite communication applications. In addition, the quadri-cluster MTS-based antenna array achieved the measured 3-dB boresight gain bandwidth of 81.3% (3.9-8.7 GHz), the maximum gain of 10.04 dBic at 5.6 GHz, and low radar cross-section. Specifically, the novelty of this research lies in the use of the sequentially-rotated feed network with the S-shaped MTS elements to effectively enhance ARBW of the quadri-cluster MTS-based antenna array for the C-band frequency spectrum.

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