Browsing by Issue Date, starting with "2015-08-27"
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- Opportunity targets as references for phase correction on passive radar channelsPublication . Marques, PauloThis paper considers the problem of phase correction on Passive Radar using opportunity targets present in the target area. The proposed technique has very low hardware and computational requirements and can be applied to configurations where it is desirable, or necessary, to have dispersed receivers, such as in a multistatic passive radar system, avoiding the use of costly methods. The main idea is to take advantage of a reference target, with a known position, to correct the phase error on the several channels. Simulation results illustrating the effectiveness and limitations of the proposed methodology are presented.
- Humidity passive sensors based on UHF RFID using cork dielectric slabsPublication . Gonçalves, Ricardo; Pinho, Pedro; Carvalho, Nuno Borges; Tentzeris, Manos M.In this paper we show the design of passive UHF RFID tag antenna on cork substrate. Due to the cork sensitivity to humidity changes, we can use the developed sensor to sense changes in the relative humidity of the environment, without the need for batteries. The antenna is built using inkjet printing technology, which allows a good accuracy of the design manufacturing. The sensor proved usable for humidity changes detection with a variation of threshold power from 11 to 15 dB between 60 and near 100% humidity levels. Presenting, therefore, reading ranges between 3 to 5 meters. © 2015 EurAAP.