Shapes transducer and reflector geometry to encode sensor responses in frequency and time, helping a wireless reader distinguish acoustic sensing devices.

Uses distinct acoustic delays and identification codes to select groups of passive sensors and distinguish their responses during wireless interrogation.

Uses acoustic pulse-compression and coding structures to return identification and measurement information from passive sensor tags.

Combines identification codes, response timing and operating frequency so a reader can distinguish individual passive sensors in a shared sensing network.

Develops code sets with low mutual interference, helping wireless readers separate the identification and measurement responses of multiple passive sensor tags.

Uses dispersive transducers and acoustic coupling structures to shape the responses of passive sensor tags.

Uses stepped acoustic-delay structures to shape a filter’s response, offering a way to build high-frequency acoustic filters and sensor tags where conventional electrode patterning becomes difficult.