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Antennas for use of security gates to prevent the shoplifting have been researched and developed based on the monopulse system at 920 MHz. Because the radiation patterns of the conventional antenna with the security gates are not enough sharp, many false operations are pointed out to recognize the RF-tags located far from the security gates. Ideas for using large antennas or radio wave absorbers were...
While keeping antenna size, a technique to narrow down the radiation patterns of the antennas operationally was proposed because of false operation of security gate to prevent shoplifting. The main emphasis was placed on the analog signal processing using the monopulse antenna system. After identifying the detected arrival angle of RF-waves from RFID-Tags, the positions of the RFID-Tags can be recognized,...
We investigate hydration of series of simple alcohol molecules using time-domain THz and FTIR spectrometers. We show that accurate measurements using the THz-TDS setup capable of 70 dB dynamic range in 30 s, can be combined well with traditional THz-FTIR measurements and that the spectra obtained by both setups are consistent with each other. Further, the difference absorption spectra between the...
As the wireless electrical vehicle charging systems, a magnetic resonance method with primary and secondary coils is attractive and is widely studied in various ways at the frequency from 81.38 kHz to 90 kHz. In such researches, the most important issue is how to improve the power transmission efficiency. In this paper, the power transmission efficiency was formulated based on the transmission line...
Effects of salts on the dynamical properties of hydration water of protein in aqueous solutions are studied using high-precision terahertz spectroscopy. Kosmotropic anions in the well-known Hofmeister series are found to decrease hydration water, and chaotropic anions increase it. This result is consistent with a theoretical model which describes the ion effects on hydration of proteins in terms of...
We studied salt effects on hydration water of protein using terahertz time-domain spectroscopy (THz-TDS). The number of hydration water molecules at the protein surface was observed to decrease by addition of ammonium sulfate, while ammonium thiocyanate increases it.
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