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Surface acoustic wave (SAW) resonators are used for a broad range of wireless sensing applications, some of them having high demands on the resolution as well as the measurement update rate. This paper presents a new interrogation method for precise and fast frequency determination of passive SAW resonators based on instantaneous frequency measurement by a low-cost six-port interferometer. Using a...
Surface acoustic wave (SAW) devices can be used for various professional metrology applications such as wireless sensing of, e.g., temperature, pressure, and torque even in harsh industrial environments. Most of the conventional readers for resonant SAW sensors require a high-speed analog-to-digital converter and calculate the fast Fourier transform (FFT) in the digital domain to determine the resonance...
This paper presents a fast responding frequency measurement system based on Six-Port technology being able to determine precisely the frequency of very short time domain pulses of one microsecond and even less in the 2.4 GHz ISM band. By using a delay line the frequency measurement can be reduced to a phase measurement that can be quickly evaluated by the Six-Port network implemented with lumped components...
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