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Author: search.filters.author.Phongcharoenpanich, ChuwongSubject: search.filters.subject.slot antenna

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    Optimized Circularly Polarized Patch Antenna with Horizontal and Side Slots for UHF RFID Readers
    (2025-01-01)
    Wichakoon, Worathan
    ;
    Nuangwongsa, Kanawat
    ;
    Phongcharoenpanich, Chuwong
    This paper presents the design and optimization of a circularly polarized UHF RFID reader antenna. The initial radiator dimensions were set at 130 mm × 130 mm, and the feed position was fine-tuned, with simulations identifying x, y = 24.5, 24.5 mm as the optimal location for impedance matching. Further optimization focused on reducing the ground plane size, with a 170 mm × 170 mm ground plane providing the optimal balance, ensuring an axial ratio below 3 dB and stable |S| (dB) response across the 920-925 MHz frequency band. The final design demonstrated an improved radiation pattern and sufficient gain, making it an effective solution for UHF RFID reader 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
    ;
    Boonpoonga, Akkarat
    ;
    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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    A Steerable Spherical Slot Array Antenna
    (1999-01-01)
    Krairiksh', Monai
    ;
    Thongsopa, Chanchai
    ;
    Phongcharoenpanich, Chuwong
    ;
    Khoomwong, Ekajif
    ;
    Leekpai, Chaiwaf
    This paper investigates the principle of a steerable spherical slot array antcnna. By combining the advantages of a spherical array in which the beam shape can be kept constant as it is steered in any direction, a simple beam steering mechanism of an active array antenna and a simple array element, a cost effective steerable antenna can be achieved. This antenna is useful in a mobile communication system.