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Author: search.filters.author.Duangsuwan, S.Subject: search.filters.subject.Friis's transmission formula

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    Measurement and evaluation of RFID transmission characteristic for long range systems
    (2009-11-18)
    Duangsuwan, S.
    ;
    Promwong, S.
    ;
    Chengtanomwong, P.
    The radio frequency identification (RFID) is a wireless communications that lets computer reads the identity to tag at 2:45 GHz can be fast identified the high speeds at 3 meters read range guaranteed at speeds of 100 km/hr. This paper used the model for expressway by supposing receiver moves to fixed transmitter, the microstrip antenna was used for both transmitter and receiver, The Friis's transmission formula is used for analysis. We considered characteristics of antennas performance at each distance transmission channel, magnitude and phase channel transfer function, bit error rate, path loss and rms delay spread were the results of experimental. This technique is very to useful for analyzed the signal performance and transmission signal in the RFID networks. © 2009 IEEE.
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    Measurement and modeling of RFID propagation channel with in an indoor environment
    (2008-12-01)
    Duangsuwan, S.
    ;
    Promwong, S.
    ;
    Sukutamatanti, N.
    The radio frequency identification (RFID) technology was automatic identify becomes was essential in the service an indoor environment such as contactless smart card and libraries [10] at high frequency in free space transfer function in wireless communication usually consider used Friss's formula for analysis. This paper the RFID propagation channel at 2.45 GHz with indoor environment. The measurement result are evaluation by using Friis's transmission formula to find the magnitude and phase channel transfer function, path loss, and power delay profile. This technique is very useful for analyzed the signal strength and radio propagation loss of RFID transmission signal © 2008 IEEE.