Structure and addressing method of passive resonant sensor capable of wireless addressing and query

Abstract

The invention discloses a passive resonant sensor structure capable of wireless addressing and inquiry, which comprises a receiving antenna connected in sequence for receiving external inquiry signals, an input three-pass passive filter with three passbands, a first passive a source mixer, a passive resonant sensor, a second passive mixer, an output passive filter, and a transmit antenna for transmitting an output passive filter signal to an interrogator; said input tee band passive filter means There are three outputs, two of which are input to the first passive mixer for frequency mixing processing, and the other output is input to the second passive mixer for frequency mixing with the output of the passive resonant sensor. The present invention can use passive resonant sensors of any frequency to form passive wireless sensors, that is, realize wireless inquiry of any passive resonant sensors, identify the sensors through filter parameters, and address the sensors by changing the query signal frequency. By selecting a passive resonant sensor with a high Q value, the wireless query performance of the passive wireless sensor can be greatly improved, thereby improving the actual sensing performance of the sensor.

Description

technical field [0001] The invention relates to passive sensor technology, in particular to a passive resonance sensor structure capable of wireless addressing and query. Background technique [0002] The sensor made of passive radio frequency devices can realize the function of passive wireless sensing: that is, the sensor can work passively and wirelessly, that is, use wireless electromagnetic waves to query the sensor, stimulate the sensor output signal and transmit it back to the query instrument wirelessly through electromagnetic waves, so The sensor wirelessly receives / transmits query / sensing signals, and the query electromagnetic wave stimulates the sensor output, so that no power supply is needed to supply the sensor to work. [0003] The current passive wireless sensors are mainly realized by surface acoustic wave sensors. Since the sensing query signal of the SAW sensor and the sensing output signal are in the same frequency band, have the same frequency, or have ...

AI Technical Summary

Problems solved by technology

For example, for surface acoustic wave resonators, addressing can only be achieved through the difference in resonant frequency. The resonant frequency of each sensor is different, and the required design parameters are different, which not only increases the complexity of device design, but also causes transmission. difference in perceptual performance

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