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Please use this identifier to cite or link to this item: http://hdl.handle.net/2108/592

Title: Realizzazione di un beamforming analogico per sistemi RFID
Authors: Salmeri, Marcello
Cambriani, Piero
Keywords: beamforming
RFID
direttività
diodi varicap
array factor
errore di fase
dipolo
Issue Date: 29-Aug-2008
Abstract: The job developed in this thesis has been that to plan an electric circuit that realize an analog beamforming with two dipole spar, related to the receiving chain of the systems RFID, in the UHF (860÷868 MHz) frequencies band. Such a project puts in evidence a solution of system and the realization of the circuit it is a part of it. In fact the use of two spar allows to increase the general profit in comparison to a single spar and therefore to exploit such advantage for the range of action of the device or to parity of this last to decrease the power in transmission. The circuit reduces to zero the phase between the signals received by the two spar allowing to drive the principal lobe of the diagram of spar in direction of the transmitter or rather that of maximum field of radiation, so maximizing the received signal. The circuit is constituted by varicap diodes which inversely polarized works as capacitances controlled in voltage. The same function is developed by the MOS va...
Description: 19. ciclo
URI: http://hdl.handle.net/2108/592
Appears in Collections:Tesi di dottorato in ingegneria

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