关键词: 声表面波标签, 叉指换能器, 反射栅, 特征频率, 激发效率, 回波特性

Abstract:

The SAW tags were simulated using FEM software COMSOL, the SAW tags were produced and tested accordingly. The simulation of the SAW tag included the characteristic frequency simulation, the inter-digital transducer excitation efficiency simulation and the echo characteristics simulation. Three groups of SAW tags were experimentally tested by the network analyzer, the test conclusions are as follows: the characteristic frequency is consistent with the design requirements; the excitation efficiency can be improved by increasing inter-digital transducers aperture; the tag code can be read out by analyzing the amplitude of the echo pulse. The test results are in accordance with the simulation analyses, validating the correctness of the simulation study. Finally, the SAW tag was welded on the printed dipole antenna board to form a SAW tag system and the system was wireless tested, showing the practicability of the SAW tag.

Key words: surface acoustic wave(SAW) tag, inter-digital transducer, reflector, characteristic frequency, excitation efficiency, echo characteristics