Two-channel SAW sensor signal-transmission system

Abstract We present a wireless signal-transmission system for surface acoustic wave (SAW) sensor signals. Using a new signal-processing method, two channels can be transmitted in parallel. Each channel is transferring the frequency and the attenuation of a SAW delay line sensor. The signal processing is combined with a correlation technique known as the spread spectrum technique. Its advantages are low transmission power and high rejection against jamming and interference. As a first step towards integration of acoustic and electronic components, we have prepared the SAW coding and decoding devices on GaAs. We describe a 10 m distance transmission with a minimum power of 10 nW and discuss the capabilities of the system.

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