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Energy-Efficient Harmonic Transponder Based on On-Off Keying Modulation for Both Identification and Sensing.
Valentina Palazzi1, Luca Roselli1, Manos M Tentzeris2
1Department of Engineering, University of Perugia, 06125 Perugia, Italy.
Sensors (Basel, Switzerland)
|January 22, 2022
Summary
This study introduces a novel passive frequency doubler with an on-off keying (OOK) modulation port for harmonic transponders. This innovation enables ultra-low-power identification and sensing applications.
Area of Science:
- Electrical Engineering
- Microwave Engineering
- Semiconductor Devices
Background:
- Harmonic transponders are crucial for identification and sensing.
- Existing frequency doublers often lack integrated modulation capabilities for efficient data transmission.
Purpose of the Study:
- To present a novel passive Schottky-diode frequency doubler with an integrated on-off keying (OOK) modulation port.
- To enable amplitude modulation of the second-harmonic output for enhanced transponder functionality.
Main Methods:
- Design and fabrication of a proof-of-concept Schottky-diode frequency doubler.
- Integration of a low-frequency MOSFET for DC impedance modulation and OOK signal generation.
- Testing the doubler's performance at 1.04 GHz with varying input power and modulation frequencies.
Main Results:
- Achieved a 23 dB on/off ratio in conversion loss at -10 dBm input power.
- Demonstrated successful wireless operation up to 1 MHz modulation frequency (fm).
- Validated theoretical predictions with experimental measurements of spectral sidebands.
Conclusions:
- The developed frequency doubler is suitable for ultra-low-power harmonic transponders.
- This technology paves the way for new applications in wireless identification and sensing.
- The integrated modulation port offers efficient data encoding for harmonic transponder systems.
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