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Author: search.filters.author.Janin, Suwan

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    A hybrid ring coupler quasi-optical antenna-mixer
    (2009-01-17)
    Janin, Suwan
    ;
    Sripimanwat, Keattisak
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    This paper proposes a hybrid ring coupler quasi-optical antenna-mixer for mitigating local oscillator retransmission. By demonstrating at K-band, the antenna element consists of back-to-back aperture coupled inverted square patch antenna to couple the RF signal at 18.8 GHz to the sigma port of a hybrid ring mixer while the LO signal at 17.5 GHz is coupled to the delta port. The HSCH-9101 Schottky diodes are used to transform the RF signal to the intermediate frequency signal at 1.3 GHz. The results show that the RF/LO isolation is better than 29 dB at 18.19 GHz, and the isotropic conversion loss of the down converted signal is better than 16 dB at 19.25 GHz. The application of the interest is an inverse measurement technique for dielectric property determination. © 2007 Elsevier GmbH. All rights reserved.
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    A multibeam antenna using quasi-optical antenna-mixers
    (2008-06-02)
    Janin, Suwan
    ;
    Sripimanwat, Keattisak
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    A multibeam antenna could be designed without using a complicated feeding system by using quasi-optical antenna-mixers. Accurate beam directions could be obtained when practical antenna patterns was taken into account in the design. The effectiveness of a three-beam antenna is demonstrated at K-band showing accurate beam directions which is very useful in modern wireless communications. © 2007 Elsevier GmbH. All rights reserved.
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    A dual-band dual-feed switched-beam patch antenna for WLAN application
    (2008-01-01)
    Tagapanij, Jukkrit
    ;
    Sooksumrarn, Pobsook
    ;
    Tantisopharak, Tanawut
    ;
    Janin, Suwan
    ;
    Krairiksh, Monai
    Due to the demand of dual-band modern wireless communications, this paper presents a dual-band patch antenna for IEEE802.11 a and g wireless local area network (WLAN) system. The antenna has bidirectional patterns that can be switched by an RF switch to select the feeding probe positions. The 2.4 GHz and 5.2 GHz patches are stacked on a ground plane and are matched to the RF switch by open stubs. Analysis and design are illustrated and throughput improvement is demonstrated in an indoor environment. Copyright © 2008 The Institute of Electronics, Information and Communication Engineers.