The concept of pulse-position modulation coding based on group delay engineered microwave C-section dispersive delay structures (DDSs) is experimentally demonstrated as a novel chipless radio frequency identification (RFID) system. The tags consist of various DDSs whose group delay responses can be engineered to provide different pulse-position modulation (PPM) codes. A 3-bit system is presented with an RFID reader and various different DDS-based tags. The proposed concept offers system simplicity, frequency scalability, andM-ary coding capability for large ID coding diversity.
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Gupta et al. (2011) studied this question.
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