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Author: search.filters.author.Chou, Hsi TsengHas files: No

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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
    ;
    Phongcharoenpanich, Chuwong
    ;
    Lertwiriyaprapa, Titipong
    ;
    Torrungrueng, Danai
    ;
    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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    One-Sixteenth Spherical Homogeneous Dielectric Lens Antenna on Metal Corner Reflector for High-Gain Radiation with Size Reduction
    (2020-03-01)
    Phaebua, Kittisak
    ;
    Lertwiriyaprapa, Titipong
    ;
    Phongcharoenpanich, Chuwong
    ;
    Chang, Yi Sheng
    ;
    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.