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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
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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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Analysis of Wireless Power Transfer between Near-Field Antennas Using the Bi-Characteristic-Impedance Transmission Line (BCITL) Model
(2025-01-01)
Phaebua, Kittisak
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Phongcharoenpanich, Chuwong
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Lertwiriyaprapa, Titipong
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Torrungrueng, Danai
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Chou, Hsi Tseng
Analysis of wireless power transfer (WPT) between near-field (NF) antennas is proposed by using a bi-characteristic- impedance transmission line (BCITL) model. In particular, misalignment between small NF transmitting (TX) and receiving (RX) antennas degrades the power transfer efficiency (PTE). The proposed novel optimization procedure, based on the BCITL model, effectively maximizes WPT area, which is strongly influenced by antenna characteristics, the RX antenna's position, and the load reflection coefficient (Γ<inf>L</inf>) at each misaligned position. In such misalignment, Γ<inf>L</inf> ≠ 0, which is a crucial parameter in impedance matching to broaden the WPT area. This letter investigates the Γ<inf>L</inf> impact on the PTE at misaligned positions based on BCITL parameters, providing a new optimization framework that adapts to varying degrees of misalignment. In simulation and measurement validation, it is demonstrated that this BCITL model may estimate an optimal Γ<inf>L</inf> (Γ<inf>L</inf> ≠ 0) to produce WPT areas much broader than those using the conventional matching condition (Γ<inf>L</inf> = 0).
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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
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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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Dual-Band Band-Stop Filter for Chipless RFID Sensor in a Dielectric Constant Determination
(2022-01-01)
Suwalak, Rattapong
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Phaebua, Kittisak
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Lertwiriyaprapa, Titipong
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Phongcharoenpanich, Chuwong
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Torrungrueng, Danai
This paper presents the dual-band band-stop filter to operate with the chipless RFID tag acts as the RFID sensor for a dielectric constant determination and the identification characteristic based on the signature responded signal from the chipless RFID sensor system. The proposed dual-band filter can generate the dual-stop band of the frequency of 2.2 GHz and 2.7 GHz. The 3-bits identification (ID) i.e., ID-01, ID-10, and ID-11 are obtained from the proposed filter. In addition, the chipless RFID sensor with band-stop filter technique can be determined the dielectric constant of RT/Duroid5880, Fr4 (Glass Epoxy), and low-Temperature cofired ceramic (LTCC).
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Chipless RFID sensing for dielectric property of light weight concrete
(2021-05-19)
Suwalak, Rattapong
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Phaebua, Kittisak
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Phongcharoenpanich, Chuwong
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Lertwiriyaprapa, Titipong
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Pathoumvanh, Somsanouk
This paper presents a passive chipless RFID tag (Electromagnetic sensor) based on the modified printed monopole antenna with a frequency filter technique. The proposed chipless RFID sensor is the wireless sensor technology with the nondestructive technique (NDT) testing. This proposed RFID tag is designed to obtain both determination and identification (ID) properties for a sensor application. To determine the dielectric constant of MUT under test, the circular monopole tag antenna is modified using adding the elliptical shape to achieve the wideband operating frequency. Moreover, this sensor is used the stripline frequency filter technique to obtain the 1-bit ID at the frequency of 2.77 GHz. The CST Microwave Studio simulator program uses to design and optimize the passive chipless RFID parameters. Simulated results show the proposed chipless RFID sensor can identify and determine the dielectric property of the LWC under test.
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One-Sixteenth Spherical Homogeneous Dielectric Lens Antenna on Metal Corner Reflector for High-Gain Radiation with Size Reduction
(2020-03-01)
Phaebua, Kittisak
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Lertwiriyaprapa, Titipong
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Phongcharoenpanich, Chuwong
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Chang, Yi Sheng
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Torrungrueng, Danai
In this letter, a three-dimensionally printed one-sixteenth fractional spherical homogeneous dielectric lens antenna on a metallic corner reflector is designed. This lens antenna is fed by an open-ended rectangular waveguide for high-gain radiation. The main design concept is to produce an equivalent spherical dielectric lens that is excited by multiple virtual sources arising from the multiple images of the original feed by the corner reflector's walls. Thus, the antenna can retain a compact size with a sufficiently effective aperture to produce a higher radiation gain. In particular, a ray-tracing method of geometrical optics is introduced for easily determining the proper sizes of the corner reflector's walls, which leads the proposed work to be more efficient than using a full-wave simulation. The superiority of the antenna is validated by examining a practical design for a radar system at 9 GHz band. It is found that the optimum dielectric constant (ϵ<inf>r</inf>), ground plane size, and effective aperture area, relatively speaking, depend on the radius of the lens's sphere. This proposed antenna well suits multifeed satellite communication antennas, radar, and other high-gain antennas applications.

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