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Subject: search.filters.subject.circular ring

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    Exponential horn antenna excited by circular ring for bridging outdoor wireless LAN applications
    (2017-12-19)
    Wounchoum, Phairote
    ;
    Wongsiritorn, Pitchanun
    ;
    Kosulvit, Sompol
    ;
    Phongcharoenpanich, Chuwong
    In this paper, a circular ring is used to excite exponential horn antenna presented for bridging outdoor wireless LAN applications. The advantage of this structure does not require a waveguide feeding system. The purpose of this antenna design is to achieve unidirectional antenna which is operated at the center frequency of 2.45 GHz (2.40 GHz to 2.484 GHz). The characteristics of the proposed antenna such as S<inf>11</inf>, radiation pattern and gain are also demonstrated. The results show that the antenna have given a high gain of 14.6 dBi and S<sup>11</sup> less than-30 dB at the center frequency. The proposed antenna is very useful for bridging outdoor WLAN systems.
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    A dual-band unidirectional antenna using a hemispherical monopole with circular reflector
    (2011-12-01)
    Nuangwongsa, Kanawat
    ;
    Phongcharoenpanich, Chuwong
    ;
    Kosulvit, Sompol
    This paper presents a unidirectional antenna using a hemispherical monopole with circular reflector for dual-band wireless communication applications. It consists of a hemispherical monopole with a sheet of stub. The stub is placed over a hemispherical monopole for low frequency band operation. The radiation patterns are controlled by circular reflector together with circular ring and rectangular ring. At 2.4 GHz, the antenna radiates by a sheet of stub and a hemispherical monopole with rectangular ring. At 5.8 GHz, it radiates by a hemispherical monopole with circular ring. The proposed antenna is designed to operate between 2.4-2.5 GHz and 5.15-5.85 GHz with S11 < 10 dB. The antenna has high gain and the radiation pattern at both bands are unidirectional beam. The simulated and measured results are presented. © 2011 IEEE.
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    Dual-band conical-beam antenna using 3D monopole with symmetrical slot on the ground plane
    (2011-11-07)
    Phongcharoenpanich, C.
    ;
    Khoomwong, E.
    In this paper, the utilization of a conducting spherical monopole radiator as a dual-band conical-beam antenna is investigated. The multi-band property is achieved by adding a quarter-wavelength slot (stub) and a conducting cylindrical ring for matching and bandwidth enhancement of the second operating band. The design is investigated and summarized based on numerical experiments or simulations. It is found that the proposed antenna provides a conical-beam with the impedance bandwidths (S11 less than 10 dB) covering two bands of operating frequencies, 2.4 to 2.5 GHz and 5.15 to 5.825 GHz. The best-matched values of S11 are about 21 and 16 dB for the first and second operating bands, respectively. Gains of the antenna are reasonably applicable, about 3.1 and 7.1 dBi at the centers of the two operating bands above. The far-field radiation patterns are of conical-beam type as required, with the main beams directed at the same 45-degree elevation angle for both operating bands. A prototype antenna has been successfully fabricated and most of the experimental results are agreed well with ones from the simulations. The investigation of this antenna also guides us that a quarter-wavelength slot may be further applied for other multi-band applications. © 2011 IEEE.
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    Dual-band conical-beam antenna for IEEE 802.11 a/b/g applications
    (2010-12-01)
    Phongcharoenpanich, C.
    ;
    Khoomwong, E.
    In this paper, the utilization of a conducting spherical monopole radiator as a dual-band conical-beam antenna is investigated. The multi-band property is achieved by adding a quarter-wavelength slot (stub) and a conducting cylindrical ring for matching and bandwidth enhancement of the second operating band. The design is investigated and summarized based on numerical experiments or simulations. It is found that the proposed antenna provides a conical-beam with the impedance bandwidths (S11 less than -10 dB) covering two bands of operating frequencies, 2.4 to 2.5 GHz and 5.15 to 5.825 GHz. The best-matched values of S11 are about -21 and -16 dB for the first and second operating bands, respectively. Gains of the antenna are reasonably applicable, about 3.1 and 7.1 dBi at the centers of the two operating bands above. The far-field radiation patterns are of conical-beam type as required, with the main beams directed at the same 45-degree elevation angle for both operating bands. A prototype antenna has been successfully fabricated and most of the experimental results are agreed well with ones from the simulations. The investigation of this antenna also guides us that a quarter-wavelength slot may be further applied for other multi-band applications. © 2010 IEICE Institute of Electronics Informati.