| Autor: |
Palazzi V; Department of Engineering, University of Perugia, 06125 Perugia, Italy., Roselli L; Department of Engineering, University of Perugia, 06125 Perugia, Italy., Tentzeris MM; School of Electrical and Computer Electronics, Georgia Institute of Technology, Atlanta, GA 30332, USA., Mezzanotte P; Department of Engineering, University of Perugia, 06125 Perugia, Italy., Alimenti F; Department of Engineering, University of Perugia, 06125 Perugia, Italy. |
| Jazyk: |
angličtina |
| Zdroj: |
Sensors (Basel, Switzerland) [Sensors (Basel)] 2022 Jan 14; Vol. 22 (2). Date of Electronic Publication: 2022 Jan 14. |
| DOI: |
10.3390/s22020620 |
| Abstrakt: |
This paper presents a novel passive Schottky-diode frequency doubler equipped with an on-off keying (OOK) modulation port to be used in harmonic transponders for both identification and sensing applications. The amplitude modulation of the second-harmonic output signal is achieved by driving a low-frequency MOSFET, which modifies the dc impedance termination of the doubler. Since the modulation signal is applied to the gate port of the transistor, no static current is drained. A proof-of-concept prototype was manufactured and tested, operating at 1.04 GHz. An on/off ratio of 23 dB was observed in the conversion loss of the doubler for an available input power of -10 dBm. The modulation port of the circuit was excited with a square wave (fm up to 15 MHz), and the measured sidebands in the spectrum featured a good agreement with the theory. Then, the doubler was connected to a harmonic antenna system and tested in a wireless experiment for fm up to 1 MHz, showing an excellent performance. Finally, an experiment was conducted where the output signal of the doubler was modulated by a reed switch used to measure the rotational speed of an electrical motor. This work opens the door to a new class of frequency doublers, suitable for ultra low-power harmonic transponders for identification and sensing applications. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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