Low Power UHF RFID occupancy sensor
Tutor / director / evaluatorMateu Mateu, Jordi
Document typeBachelor thesis
Rights accessOpen Access
In this project we use the idea of RFID (Radio Frequency Identification), which is storage and information recuperation method. This method use devices called tags RFID for the identification. This RFID tags incorporate antennas to let to receive and to respond radiofrequency requests from a RFID transmitter-receiver. The fundamental purpose of the RFID technology is to transmit the identity of an object by means of radio waves. Essentially what we want to do is an antenna based sensing, which means use the antennas properties like a sensor. The proposal is a technique for using the changes in the response of the 2.4 GHz antenna as a sensing mechanism. We use the Wireless Identification and Sensing Platform (WISP), which is a computational sensing and programmable platform without battery designed to investigate in improving sensor RFID applications. WISP can operate using power transmitted from a (UHF) RFID reader located at long range and also communicate data in a single response packet. The objective of this project lies in analyzing the performance of a microwave antenna acting as occupancy sensor. How to determine when an object is positioned above the antenna has many applications in our society. One of the utilities is the detection of parking spaces available in the street, but there are so many others. To achieve these goals we first will make some voltage measurements of what is capture by the antenna by placing an envelope detector after it and then we will simulate its behavior with ADS and HFSS simulation. We will also use the MSP430 microchip to read the DC voltage after the antenna and finally we will create an application with the Microsoft Visual Studio to plot the results graphically and finally we draw our conclusions. Analyzing the results we can say that we have reached satisfactory conclusions.