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Data collection of the radio wave propagation loss in farm fields is valuable to design a wireless network in a farm. They are used in calculating the link budget to establish a proper and efficient node arrangement. In this study, propagation losses in a 50 × 50 m mulberry field were measured in 920-MHz band with respect to the azimuthal angle of the propagation direction to arrays of bushes. Received...
Collecting data of propagation losses in farm fields is important to design a wireless network in a farm. They are used in calculating the link budget to establish a proper and efficient node arrangement. In this study, propagation losses in a 50 × 50 m mulberry field were measured in 920-MHz and 2.4-GHz bands. Received signal strength indicators (RSSIs) were measured as a function of the distance...
RFIDs in the UHF band are getting popular gradually in a lot of situations. Many kinds of small antennas have been contrived for UHF RFIDs. However, the antenna characteristics deteriorates in the case of using the antenna around water. In this report, a small cylindrical antenna was designed, which has little effect of water. The antenna is fed from an excitation loop outside of the radiation loop...
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