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Author: search.filters.author.Phongcharoenpanich, ChuwongSubject: search.filters.subject.Polarization

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    Polarization reconfigurable suspended antenna using RF switches and P-I-N diodes
    (2014-01-01)
    Boonying, Komkris
    ;
    Phongcharoenpanich, Chuwong
    ;
    Kosulvit, Sompol
    Polarization reconfigurable square flat antenna using RF switches and P-I-N diodes is presented for WLAN application operated at the center frequency of 2.45 GHz. The proposed antenna consists of the square flat structure, three switches (six P-I-N diodes), transmission-line phase shifters of 0 and 90 degrees. The antenna can be switched between 5 different states: vertical, horizontal and slant polarizations for linear polarization (LP), left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP) by controlling the DC bias of 5 V and the current of 16 mA for the P-I-N diodes. The simulated and measured results show that the proposed antenna can cover the impedance bandwidth from 2.400 GHz to 2.484 GHz and good axial ratio for the circular polarization. © 2014 IEEE.
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    A probe-fed U-shaped cross-sectional antenna with tuning stubs on a U-shaped ground plane
    (2006-01-01)
    Srimoon, Duang Arthit
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    A probe-fed U-shaped cross-sectional antenna with tuning stubs on a U-shaped ground plane is proposed for wideband applications. The bottom of the antenna is etched to form tuning stubs for impedance matching. The simulated results of return loss, co- and cross-polarized patterns are presented and compared with the measured ones. Characteristics of a constructed antenna prototype at the operating frequency show that the antenna has an impedance bandwidth (2:1 VSWR) of 37.44% and average gain level of 8.5 dBi. Good radiation characteristics of the proposed antenna have been obtained that is the cross-polarization level and front-to-back ratio in both E- and H-planes across the large bandwidth are better than 22 dB and 12 dB, respectively. Copyright © 2006 The Institute of Electronics, Information and Communication Engineers.