Wireless wideband SAW sensor - antenna design

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

doi:10.1109/freq.2010.5556326

Cited by 16 publications

(4 citation statements)

References 10 publications

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“…The first uses a PC board, open sleeve folded dipole antenna and the surface mount packaged (SMP) SAW is soldered to the board, shown in Figure 15. The antenna with SMP device was 125 mm × 55 mm on a 32 mil FR4 copper clad PC board [20]. The measured antenna gain, in a 50-ohm system, is approximately 1.5 dB and had a bandwidth of 140 MHz.…”

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%

“…Left—Photo of a packaged 915 MHz SAW sensor and antenna [20]. The antenna is a simple folded dipole on a PCB connected to the device through the surface mount package.…”

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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“…In previous studies, surface acoustic wave (SAW) temperature sensors were connected to their corresponding antennas via PCB boards [10][11][12]. Typically, FR-4 is used as the substrate for PCB, which exhibits poor thermal conductivity, high hardness, and limited environmental adaptability.…”

Section: Introductionmentioning

confidence: 99%

Wireless Temperature Measurement for Curved Surfaces Based on AlN Surface Acoustic Wave Resonators

Liu,

Zhou,

Lou

2024

Micromachines

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In this paper, we propose a novel method for temperature measurement using surface acoustic wave (SAW) temperature sensors on curved or irregular surfaces. We integrate SAW resonators onto flexible printed circuit boards (FPCBs) to ensure better conformity of the temperature sensor with the surface of the object under test. Compared to traditional rigid PCBs, FPCBs offer greater dynamic flexibility, lighter weight, and thinner thickness, which make them an ideal choice for making SAW devices working for temperature measurements under curved surfaces. We design a temperature sensor array consisting of three devices with different operating frequencies to measure the temperature at multiple points on the surface of the object. To distinguish between different target points in the sensor array, each sensor operates at a different frequency, and the operating frequency bands do not overlap. This differentiation is achieved using Frequency Division Multiple Access (FDMA) technology. Experimental results indicate that the frequency temperature coefficients of these sensors are −30.248 ppm/°C, −30.195 ppm/°C, and −30.115 ppm/°C, respectively. In addition, the sensor array enables wireless communication via antenna and transceiver circuits. This innovation heralds enhanced adaptability and applicability for SAW temperature sensor applications.

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“…Up to now, many SAW sensors are manufactured and packaged without any antenna offering a 50 Ω interface where conventional (external, bulky) antennas may be connected [1,20] or are not intended for wireless read-out [2]. Attempts to lower the footprint of planar antennas include meander structures [21] and loop antennas [8]. However, to the best knowledge of the authors up to now not much effort has been spent on the antenna design in the past.…”

Section: Introductionmentioning

confidence: 99%

Electroless-Deposited Platinum Antennas for Wireless Surface Acoustic Wave Sensors

et al. 2019

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In an effort to develop a cost-efficient technology for wireless high-temperature surface acoustic wave sensors, this study presents an evaluation of a combined method that integrates physical vapor deposition with electroless deposition for the fabrication of platinum-based planar antennas. The proposed manufacturing process becomes attractive for narrow, thick, and sparse metallizations for antennas in the MHz to GHz frequency range. In detail, narrow platinum-based lines of a width down to 40 μm were electroless-deposited on γ-Al 2O 3 substrates using different seed layers. At first, the electrolyte chemistry was optimized to obtain the highest deposition rate. Films with various thickness were prepared and the electrical resistivity, microstructure, and chemical composition in the as-prepared state and after annealing at temperatures up to 1100 ∘C were evaluated. Using these material parameters, the antenna was simulated with an electromagnetic full-wave simulation tool and then fabricated. The electrical parameters, including the S-parameters of the antenna, were measured. The agreement between the simulated and the realized antenna is then discussed.

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Wireless wideband SAW sensor - antenna design

Cited by 16 publications

References 10 publications

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

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

Wireless Temperature Measurement for Curved Surfaces Based on AlN Surface Acoustic Wave Resonators

Electroless-Deposited Platinum Antennas for Wireless Surface Acoustic Wave Sensors

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