Integrated 915MHZ OFC SAW sensors

Gallagher, M.; Santos, B.; Malocha, D.C.

doi:10.1109/wamicon.2010.5461895

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…The measured antenna gain, in a 50-ohm system, is approximately 1.5 dB and had a bandwidth of 140 MHz. The second approach uses a fully integrated SAW sensor and antenna on the LiNbO 3 substrate, as shown in Figure 15 [21]. The first prototype is less efficient than the PC board antenna, but was successfully interrogated from several meters.…”

Section: Resultsmentioning

confidence: 99%

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A Passive Wireless Multi-Sensor SAW Technology Device and System Perspectives

Malocha

Gallagher

Fisher

et al. 2013

Sensors

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This paper will discuss a SAW passive, wireless multi-sensor system under development by our group for the past several years. The device focus is on orthogonal frequency coded (OFC) SAW sensors, which use both frequency diversity and pulse position reflectors to encode the device ID and will be briefly contrasted to other embodiments. A synchronous correlator transceiver is used for the hardware and post processing and correlation techniques of the received signal to extract the sensor information will be presented. Critical device and system parameters addressed include encoding, operational range, SAW device parameters, post-processing, and antenna-SAW device integration. A fully developed 915 MHz OFC SAW multi-sensor system is used to show experimental results. The system is based on a software radio approach that provides great flexibility for future enhancements and diverse sensor applications. Several different sensor types using the OFC SAW platform are shown.

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Section: Resultsmentioning

confidence: 99%

“…The SAW sensor, seen in-between the dipole arms, requires line width resolution of approximately 0.8 μm, compared to the antenna having an order of magnitude larger dimensional resolution. The SAWtenna is rugged and useful for many applications requiring no mechanical bonds [21]. …”

Section: Figurementioning

confidence: 99%

A Passive Wireless Multi-Sensor SAW Technology Device and System Perspectives

Malocha

Gallagher

Fisher

et al. 2013

Sensors

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“…Wireless sensors could be used for structural health monitoring (SHM) systems which are desired on most of the aircraft for dynamic monitoring [1][2][3]. In recent years, researchers show an increasing interest in wireless passive sensor technology [4][5][6][7][8][9][10][11], since it does not need battery supply and is maintenance free. Compared with the traditional wireless sensing technologies [12][13][14], wireless passive sensors could have a long operational life cycle, which is feasible for harsh environment applications.…”

Section: Introductionmentioning

confidence: 99%

An Impedance-Loaded Orthogonal Frequency-Coded SAW Sensor for Passive Wireless Sensor Networks

Dai

Fang

Zhang

et al. 2020

Sensors

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A passive wireless impedance-loaded orthogonal frequency-coded (OFC) surface acoustic wave (SAW) sensor for wireless sensor networks was proposed in this paper. One of the chips on OFC SAW tag is connected to an external sensor, which could cause a phase shift in the time response of the corresponding part on the SAW device. The phase shift corresponds to the sensed quantity, which could be temperature, strain, vibration, pressure, etc. The OFC SAW tag is isolated by a proper package from the direct effect of the measurand on the device’s response which could avoid the multiple measurands coupling. The simultaneous work of multiple sensors is guaranteed by orthogonal frequency coding. By processing the response based on an extended matched filter algorithm, sensing information of the specific coded OFC device can be extracted from the superimposed response of multiple independent encoded sensors. Compared to previous methods, the proposed method can produce a more flexible passive (battery-free) wireless sensor suitable for large-scale wireless sensor networks. Simulation and experimental results demonstrate the effectiveness of the sensor.

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Integrated 915MHZ OFC SAW sensors

Cited by 2 publications

References 9 publications

A Passive Wireless Multi-Sensor SAW Technology Device and System Perspectives

A Passive Wireless Multi-Sensor SAW Technology Device and System Perspectives

An Impedance-Loaded Orthogonal Frequency-Coded SAW Sensor for Passive Wireless Sensor Networks

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