KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Akkaraekthalin, PrayootSubject: search.filters.subject.Wideband

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    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.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Wideband uni-directional CPW-fed slot antennas using loading metallic strips and a widened tuning stub on modified-shape reflectors
    (2007-01-01)
    Akkaraekthalin, Prayoot
    ;
    Chaimool, Sarawuth
    ;
    Krairiksh, Monai
    In this paper, CPW-fed slot antennas using loading metallic strips and a widened tuning stub (CPW-FSLW) which provides wideband operation on the flat, a ?-shape reflector with horizontal plate that prevents the back radiation and provides the uni-directional radiation are investigated. We observe that the size and shape of the reflector have significant impact on the impedance matching and radiation patterns. By fabricating the CPW-FSLW on the ?-shape reflector with horizontal plate structure, noticeable enhancements in both radiation pattern and bandwidth are achieved. The antennas are verified both through numerical simulations and also measurements of the experimental prototypes and these confirm the good performance antennas. It is found that the proposed antenna can deliver a measured impedance bandwidth of 64% from 1.6 to 3.1 GHz for VSWR ≤ 2. The antennas are designed to have wideband operation suitable for applications in GSM1800, GSM1900, PCS, IMT-2000 and WLAN bands. Copyright © 2007 The Institute of Electronics, Information and Communication Engineers.