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Author: search.filters.author.Aunchaleevarapan, Kraison

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    A circularly polarized square plate antenna with two inclined slots for UHF-RFID reader
    (2011-12-01)
    Charoenchue, Putuch
    ;
    Phongcharoenpanich, Chuwong
    ;
    Phaebua, Kittisak
    ;
    Aunchaleevarapan, Kraison
    This paper presents a circularly polarized square plate antenna with two inclined slots excited by a probe on square ground plane to radiate circularly polarized unidirectional beam. This antenna is proposed for installing at the reader of Radio Frequency Identification (RFID) at Ultra High Frequency (UHF) band. UHF-RFID in Thailand has the bandwidth from 920 MHz to 925 MHz, and center frequency is 922.5 MHz. The proposed antenna structure is simple because of using the single probe to feed the antenna for circularly polarized radiation. The pattern of this antenna is unidirectional beam with gain 8.6 dBic and axial ratio of 0.92 dB at center frequency. The obtained measured bandwidth is 50 MHz. © 2011 IEEE.
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    A study on the system imbalance of the single-switch converter for the conductive common mode noise reduction
    (2007-01-01)
    Boonpirom, Nimit
    ;
    Prempraneerach, Yothin
    ;
    Paithoonwatanakij, Kitti
    ;
    Aunchaleevarapan, Kraison
    ;
    Nitta, Shuichi
    This paper reduces system imbalance by replacing the single-switch converter with a synchronized double-switch converter based on two active switches technique and hybrid balance technique, including active balance and passive balance for common mode noise reduction. The system balance is experimentally evaluated by the common mode rejection ratio (CMRR). Finally, examples show that the CMRR of the single-switch converter is improved from 1.67 dB to 32.04 dB when the double-converter with two active switches technique is applied and to 41.5 dB when the double-switch converter with hybrid balance technique is applied. Copyright © 2007 The Institute of Electronics, Information and Communication Engineers.
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    Novel method for predicting PCB configurations for near-field and far-field radiated EMI using a neural network
    (2003-01-01)
    Aunchaleevarapan, Kraison
    ;
    Paithoonwatanakij, Kitti
    ;
    Khan-Ngern, Werachet
    ;
    Nitta, Shuichi
    The Neural Network (NN) is applied to recognize basic PCB configurations using its magnetic near-field spectra and radiated far-field emission. The learning process is accomplished by using the computed spectra of the radiated field from PCBs having different configurations. The anomaly is detected through the monitoring of the spectra's amplitude frequency by injecting a voltage pulse at the PCB configuration. The trained NN is then applied to the identification of PCB layouts from radiated emission measurements. The trained NN can identify all of those PCB configurations from the magnetic near-field spectra and the radiated far-field EMI. Moreover, the calculated results of the NN are compared with the actual far-field measurements and other models for evaluation. Finally, the NN used for predicting far-field emission from their magnetic near-field measurement is proposed. Experiments show that the NN can predict the far-field spectra from the magnetic near-field spectra.