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Dual-Band CP Metasurface-Array Antenna with Sequential-Phase Feed Network for C-Band Operation
(2026-01-01)
Kakhong, Khwanlada
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Phaebua, Kittisak
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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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Wideband Circularly Polarized Sequentially-Rotated Cubic-Shaped Dielectric Resonator Array Antenna
(2025-01-01)
Supreeyatitikul, Nathapat
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Lertwiriyaprapa, Titipong
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Phongcharoenpanich, Chuwong
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Konpang, Jessada
This study proposes a cubic-shaped dielectric resonator (DR) broadband circularly polarized (CP) array antenna for S-band networks. The design includes 2 × 2 cubic-shaped DR units and a substrate. The upper and lower substrates feature a split-annular aperture ground plane and a sequential-phase feed. Employing the sequential-phase feed, the proposed array antenna aims to enhance performance metrics, including RLBW, ARBW, and antenna gain. Simulation results indicate a RLBW of 56.25% (2.25 - 3.6 GHz) and an ARBW of 43.33% (2.38 - 3.42 GHz). The optimal gain achieved is 9.14 dBic at 3.3 GHz. Furthermore, the array antenna demonstrates right-hand circular polarization (RHCP) characteristics, rendering it suitable for S-band technology.
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Two-Port Circularly Polarized Slot-Coupled Antenna Using Novel AMC Structure
(2025-01-01)
Supreeyatitikul, Nathapat
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Kakhong, Khwanlada
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Phongcharoenpanich, Chuwong
;
Konpang, Jessada
This research introduces a two-port circularly polarized (CP) slot-coupled MIMO antenna with an novel artificial magnetic conductor (AMC) reflector for Vehicle-to-Everything (V2X) technology. The proposed antenna comprises two layers separated by an air gap: the upper layer includes the dual-element slot-integrated MIMO antenna with microstrip-line feeds and defected ground structures (I-shaped slots) for coupling reduction, while the lower layer integrates an 8 × 8 array of AMC units. The AMC enhances gain and improves radiation properties through its reflective behavior. Measured results confirm the antenna's suitability for V2X applications, achieving a wide return loss bandwidth (RLBW) of 32% (4.72 - 6.61 GHz), axial ratio bandwidth (ARBW) of 21.18% (5.2 - 6.45 GHz), and isolation greater than 19 dB. The antenna attains a peak gain of 8.6 dBic at 5.9 GHz, with an envelope correlation coefficient below 0.003 and diversity gain exceeding 9.98 dB. The key innovation of this work lies in the combination of CP slot-integrated MIMO design with a novel AMC structure to enhance gain and isolation, making it highly effective for V2X wireless networks in modern vehicular communication networks.
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Design and Experimentation of CP Sequential-Rotated Patch Antenna for Nanosatellite Technology
(2024-01-01)
Supreeyatitikul, Nathapat
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Phaebua, Kittisak
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Phongcharoenpanich, Chuwong
;
Konpang, Jessada
This paper proposes a circularly polarized (CP) sequential-rotated patch antenna for nanosatellite communication systems. The proposed CP sequential-rotated patch antenna comprised of 2 × 2 corner-truncated rectangular patch with a slot, and sequentially rotated feeding (SRF). The SRF was used to improve impedance matching and CP bandwidth. These patches and SRF were fabricated on Rogers 5880 substrate. Moreover, this antenna was integrated with radome and enclosures for space environment hazards. The measured results at 2.1 GHz (center frequency) achieved RLBW of 73.33% (1.46 - 3 GHz) and ARBW of 23.33% (1.87 - 2.36 GHz). The optimal gain (RHCP) was 5 dBic at 2.25 GHz with bi-directional radiation, rendering the proposed antenna suitable for S-band nanosatellite technology.
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Enhancing Bandwidth of Circularly Polarized DRA Using Embedded Slot-Coupled Patch
(2024-01-01)
Supreeyatitikul, Nathapat
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Phongcharoenpanich, Chuwong
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Konpang, Jessada
This paper proposes a bandwidth enhancement technique for circularly polarized (CP) dielectric resonator antenna (DRA) using the embedded slot-coupled patch. The proposed CP DRA for mid-band 5G applications consisted of an aperture-coupled feed, a dice-shaped dielectric resonator (DR), and an embedded slot-coupled patch. A slot-coupled feed included cross-aperture ground plane (upper substrate) and microstrip-line feed (lower substrate). The dice-shaped DR sits at the center of the cross-aperture ground plane. The slot-coupled patch was embedded into DR for bandwidth enhancement. The DR usually functioned as a resonance cavity, producing TEll1 mode. The embedded slot-coupled patch can generate the resonance frequency mode (TM01 and TMl0) at a higher frequency, resulting in a wide reflection coefficient bandwidth and ARBW. The results of simulation reflection coefficient bandwidth and ARBW at center frequency (3.5 GHz) achieved 44% (3.12 - 4.66 GHz) and 36.57% (3.23 - 4.51 GHz). The peak RHCP gain was 8.7 dBic at 4.5 GHz with right-hand circular polarization, rendering the proposed CP DRA with embedded slot-coupled patch suitable for mid-band 5G wireless networks.
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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
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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
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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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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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