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Frequency readjustment of excitation signals for resonant surface acoustic wave sensors in the 2.45 GHz ISM band
Publikationstyp
Conference Paper
Date Issued
2019-12
Sprache
English
TORE-URI
Volume
2019-December
Start Page
147-149
End Page
149
Article Number
9038210
Citation
Asia-Pacific Microwave Conference Proceedings, APMC (2019-December): 9038210 (2019)
Contribution to Conference
Publisher DOI
Scopus ID
In this publication an essential step is described to use a six-port based instantaneous frequency measurement (IFM) system for determining applied force on a resonant surface acoustic wave (SAW) sensor in the worldwide approved 2.45 GHz industrial, scientific and medical (ISM) band. Due to the comparably high frequency for such sensors, side spurs may arise in the frequency response close to the main resonance because of non-linearities in the materials and the manufacturing process of these sensors. In order to keep the measurement error low and the signal to noise ratio (SNR) high, the readjustment of the excitation frequency of the sensor is proposed. Measurements were performed that show a significant difference between readjusted and constant excitation frequency. This improvement thus makes the system far more tolerant for sensors with unexpected side spurs.
Subjects
Electromechanical devices
Mechanical variables measurement
Microwave sensors
Sensor systems