The Design And Test Technology Of RFID Chipless TAG

Radio frequency identification (RFID) is a non-contact technology which uses radio signal to achieve data exchange and automatic identification on static and moving objects.In recent years, RFID technology is widely used in transportation, logistics management, etc. It becomes a development trend that production costs can be greatly reduced by using the chipless tag. This thesis focuses on the design and testing technology of RFID chipless tag.The design of chipless RFID tag in this thesis is based on the spectral characteristics of the signal. The most important module is the design of multi-spiral filter stopband. Microstrip structure and coplanar waveguide CPW structure will be used in the design of the spiral filter. At the same time, the particular frequency resonance of signals will be brought about taking advantage of their various bandstop characteristic. Among them,14bit encoding can be achieved by the spiral microstrip structure filter which working frequency is from3.2GHz to4.6GHz;10bit coding can be achieved by structure CPW spiral filter, which working frequency is from3.5GHz to5.5GHz. ADS software will be used in the simulation and optimization of the two structures as well as the processing test of microstrip structure. S12test results agree well with the simulation results.Then this paper studies the RFID chip tag test technology. First of all, microstrip structure calibration parts will be designed. Simultaneously, the SOLT and TRL calibration algorithm can be realized through MATLAB that well apply in the test of the no label chip. And then the author designed the signal source and receiver antenna (log periodic dipole antenna), Tags transmit and receive antennas (single-level sub-antenna). In the process of design, the author has focused on the feather of antenna ultra-bandwidth, gain and polarization mode, etc. Last but not least, chipless tags simulation test system will be set up. Chipless tags test results are good with the use of a vector network analyzer, which basically meet the design requirements.