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We have been developing an electromagnetic field intensity measurement system using an absorption screen made of dielectric material. In this developed system, a very small change of temperature on an absorption screen illuminated by the electromagnetic wave is measured using an infrared camera with 2-D lock-in processing technique. An antenna is ordinary used for measurement of electromagnetic field...
This paper proposes the way to measure two impedances when a tag is operating. It also proposes to quantify the change of received power when the distance between passive UHF RFID tags become close each other. We constructed the system to measure the tag IC impedance in operation and calculate the reader and tag's change of received power according to the tag IC impedance's change due to the closeness...
In this paper, we discuss change of read range between a UHF passive RFID tag and reader when a tag is close to another tag. The read range is determined by the strength of forward link and reverse link, which are represented by received power at a tag and reader, respectively. Approaching of tags causes electromagnetic interference between antennas of tags and results in change in impedance matching...
We have developed a 3-D electromagnetic field measurement system using 2-D lock-in amplifier. In this system, a modulated amplitude of electromagnetic wave is illuminated to an absorption screen to generate a heat distribution. A very small change of temperature on a screen illuminated with the modulated electromagnetic wave is measured using an infrared thermograph camera. To show the usefulness...
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