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Author: search.filters.author.Phongcharoenpanich, ChuwongSubject: search.filters.subject.Circularly polarized

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    Single-Layer Wideband CP CPW-Fed Antenna based on Staircase-Shape Metasurface
    (2021-01-01)
    Supreeyatitikul, Nathapat
    ;
    Akkaraekthalin, Prayoot
    ;
    Phongcharoenpanich, Chuwong
    This research proposed a single-layer wideband circularly polarized (CP) coplanar waveguide (CPW)-fed antenna based on staircase-shaped metasurface (MTS) for C-band applications. The proposed CPW-fed antenna was a single-layer, which consisted of 4 × 4 periodic staircase-shaped MTS on the upper layer, a CPW feed, and a rectangular slot ground plane on the lower layer. A linearly polarized (LP) wave was generated by a CPW with a slot ground plane and converted to a circularly polarized wave by staircase-shaped MTS elements. The dimensions of the proposed antenna were 0.54 × 0.54 × 0.04 at the lowest operating frequency. The simulated results of impedance bandwidth (IBW) and axial ratio (ARBW) at the center frequency of 5.2 GHz were 67.3% (4.1 - 7.6 GHz) and 15.9% (4.8 - 5.7 GHz), respectively. The maximum gain was 5.6 dBi at 5.3 GHz. The radiation patterns of the proposed CPW-fed antenna based on staircase-shaped MTS were right-hand circular polarization (RHCP) characteristic radiation at the operating frequency.
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    A broadband dual-sense circularly polarized antenna
    (2017-04-26)
    Lertsakwimam, Kittima
    ;
    Phongcharoenpanich, Chuwong
    ;
    Fukusako, Takeshi
    A dual-sense circularly polarized antenna is proposed with a broadband 3-dB AR characteristics. The antenna consists of circular ring, four straight probes, which are place in along diameter direction of ring, four straight bars, and a reflector. The antenna is excited by the four straight probes to obtain both right hand circular polarization (RHCP) and left hand circular polarization (LHCP). The antenna has a 10dB-retum loss from 1.1 GHz-2.2 GHz, and the 3dB Axial Ratio (AR) bandwidth is from 1.2 GHz-2.1 GHz (the relative bandwidth is 54.5 %) and more than -30dB-level of isolation in frequency range of 1.4-1.7 GHz. The antenna element broadside gain is approximately 9.5 dBic at 1.7 GHz.