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Low-loss SAW RFID using the reflective multistrip coupler as reflectors.

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This study introduces a new Surface Acoustic Wave Radio Frequency Identification (SAW RFID) design using reflective multistrip couplers (RMSCs). This innovation significantly enhances wireless interrogation range by improving signal reflection for SAW RFID systems.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Surface Acoustic Wave Radio Frequency Identification (SAW RFID) is crucial for remote sensing and identification.
  • Conventional SAW RFID tags face limitations in wireless interrogation range due to energy loss from low-reflectance reflectors.

Purpose of the Study:

  • To propose and validate a novel SAW RFID architecture using reflective multistrip couplers (RMSCs).
  • To overcome the limitations of conventional reflectors and enhance the wireless interrogation range of SAW RFID systems.

Main Methods:

  • Employed RMSCs that leverage velocity differences between wave modes for coherent reflection.
  • Conducted numerical simulations to analyze performance and optimize strip numbers.
  • Fabricated and tested a 433 MHz SAW RFID prototype on a 128°YX-LiNbO3 substrate.

Main Results:

  • Achieved a low loss of 1 dB and minimal reflectance difference (0.33 dB) compared to simulations.
  • Demonstrated a -10.63 dB peak time-domain amplitude, a significant improvement over conventional designs.
  • Confirmed linear time delay and phase responses across a wide temperature range (-20°C to 90°C) with R² > 0.9999.

Conclusions:

  • The RMSC reflector is a high-reflectance solution for improving SAW RFID performance.
  • This technology holds significant potential for advancing long-range wireless sensing applications.