In the realm of frequency-domain chipless RFID tags, diversity in tag design approaches has led to a wide variety of reader system requirements, especially in terms of polarization. Other reading challenges, such as rotation sensitivity, add to the reader requirements and to the implementation constraints current reader systems have. This work proposes a monostatic chipless RFID tag reading methodology that utilizes a dual circularly-polarized antenna which is capable of reading frequency-based chipless RFID tags independent of their scattering polarization. Additionally, this method provides results for six distinct polarizations with one straightforward two-port measurement and one simple matrix transformation. These six polarizations provide more information about the tag and allow for hybrid chipless RFID coding schemes to be more easily implemented than with other reading schemes that would require multiple measurements. The optimized design of the antenna is presented and the reading methodology is demonstrated through both simulation and measurement utilizing a 3D printed version of the antenna.
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