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Wireless sensors can be realized by integrating a sensor with a passive commercial radio-frequency identification (RFID) chip. When activated, the chip responds with a digitally encoded signal that not only identifies the sensor but also contains information about the sensor state. Two devices have been developed to date: a temperature-threshold indicator and a chloride-threshold indicator. This paper discusses basic concepts, design issues, and preliminary performance.

A theory for predicting the electromagnetic scattering from a rectangular slot is developed and is used to evaluate the possibility of determining the slot depth from scattering measurements. Experimental results obtained at 100 GHz are presented and compared with theory. Practical limitations of the technique are discussed. BAHR: ESTIMATING THE DEPTHOF RECTANGULAR SLOTS