Research And Design Of Novel Chipless RFID Tag Based On Complex Natural Resonance

Chipless RFID tags is an important part of RFID technology.Because of its low cost,it may be widely applied and promoted in the future.However,the existing chipless tags have some shortcomings such as low data capacity and large size.This paper focuses on the structure design of chipless RFID tags.According to the relationship between the scatter’s complex nature resonance and the natural structure.An polarization independent tag based on right-angel-shaped is designed.The tag is etched on the substrate by several right-angel-shaped regularly arranged resonators.The tag has good stability for incident waves in a variety of polarized directions.A novel chipless tag encoding method to double the encoding capacity without increasing the mutual coupling between resonators is proposed.The RFID tag operates in the UWB band,and a high encoding density of 3.3bit/cm is obtained on the area of 22mm×11mm.Finally,the tags were measured and analyzed.After that,two kinds of dual-polarized chipless RFID tags are designed.The tag structure can be operated in both horizontal and vertical polarization wave,and the two operating modes do not interfere with each other,which effectively improves the coding efficiency of the tags.At the same time,a hybrid coding method was designed for this structure.In the ultra-wideband range,the highest encoding density can reach 7.7bit/cm~2.Finally,the pole information of the tags is extracted by the singularity expansion method(SEM)and the martrix pencil method(MPM),and the feasibility of labeling the tag structure based on the pole information is verified.Thus,the tag’s detection and identification were realized.