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A 2.4 GHz beam steering antenna array is presented and tested in this paper. This antenna uses the 4×4 planar Butler matrix as a key component of phase-shifter which exhibits ±135° and ±45° phase shifts corresponding with four position of main beam. The proposed design is fully described, from the element blocks (antenna element, butler matrix) to the full integrated beam steering antenna array. The...
This paper presents a novel dual-band rectenna for RF energy harvesting system. This rectenna is created from a dual-band antenna and a dual-band rectifier which operates at GSM bands (900 MHz and 1800 MHz). The printed monopole antenna is miniaturized by two meander-lines. The received signal from the receiving antenna is rectified by a voltage doubler using Schottky diode SMS-7630. The rectifier...
In this paper, we present a low-cost localization system using UHF RFID passive tags in indoor environments. It can be used to locate objects or people in an unfamiliar building. The signal power distribution, propagation conditions and environmental factors will be studied in more detail. Landmark reference tag grid is applied in our system. The tag RSSI (Received Signal Strength Indication) is the...
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