Wireless Passive Temperature Sensor Realized on Multilayer HTCC Tapes for Harsh Environment

The microwave dielectric properties of La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics are studied, in order to develop a wireless dielectric resonator antenna temperature sensor. The microwave dielectric properties of La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics are determined using X-ray diffraction patterns, Rietveld refinement patterns, Raman spectra, and by observing the microstructures. La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics are prepared using a conventional solid state method. As the degree of substitution of Ca 2+ and Sr 2+ increases, the position of the A 1g (O) Raman mode shifts toward a lower frequency. The La(Mg 0.4 Ca 0.1 Sn 0.5)O 3 ceramic exhibits a minimum full width at half maximum for the A 1g (O) Raman vibration mode in the series of La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics. La(Mg 0.49 Ca 0.01 Sn 0.5)O 3 ceramics that were sintered at 1600°C for 4 h have an apparent density of 6.57 g/cm 3 , a dielectric constant (¾ r) of 19.9, a quality factor (Q©f) of 94,300 GHz, and a temperature coefficient at the resonant frequency (¸f) of ¹87 ppm/°C. The development process and test results for a dielectric resonator antenna temperature sensor that uses La(Mg 0.49 Ca 0.01 Sn 0.5)O 3 ceramics are recorded. The resonant frequency is 9.35 GHz and the 3 dB bandwidth measured at room temperature is 6.4 MHz. A sensitivity of ¹1.03 MHz/°C is achieved.

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“…Therefore, this study measures the resonance frequency using a time domain gating technique. 20) Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

La(Mg0.5−xMexSn0.5)O3-based (Me = Ca, Sr) dielectric resonator antenna for use in a wireless high-temperature sensor

Chen

You

2019

J. Ceram. Soc. Japan

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“…Subsequently, to develop a sensor that can operate in higher temperature environments, Tan et al proposed a wireless passive temperature sensor fabricated using multilayer HTCC tapes. The average sensitivity of this sensor, which exhibits good repeatability and reliability, can reach 5.22 kHz/°C with a temperature range from room temperature to 900 °C [ 29 ].…”

Section: Research Status Of Wireless Passive Lc Sensors For Harsh mentioning

confidence: 99%

Review of Research Status and Development Trends of Wireless Passive LC Resonant Sensors for Harsh Environments

Tan

Jia

et al. 2015

Sensors

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Measurement technology for various key parameters in harsh environments (e.g., high-temperature and biomedical applications) continues to be limited. Wireless passive LC resonant sensors offer long service life and can be suitable for harsh environments because they can transmit signals without battery power or wired connections. Consequently, these devices have become the focus of many current research studies. This paper addresses recent research, key technologies, and practical applications relative to passive LC sensors used to monitor temperature, pressure, humidity, and harmful gases in harsh environments. The advantages and disadvantages of various sensor types are discussed, and prospects and challenges for future development of these sensors are presented.

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“…Depending on the transduction principle, the capacitance, inductance or resistance of the LC sensing circuit is affected by the measurand, allowing both physical and chemical sensors. Therefore, various kinds of passive wireless LC sensors have been developed to measure parameters inside sealed or harsh environments [2]- [6], e.g., pressure inside the human body [7]- [9], electrocardiogram [8], high temperatures in internal combustion engines [10], quality of packaged food [11] [12], water content in building materials [13], pH control [14], temperature [6], [15], [16], and relative humidity [17]- [21], among others.…”

Section: Introductionmentioning

confidence: 99%

Readout Circuit With Improved Sensitivity for Contactless LC Sensing Tags

et al. 2020

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In this work we present a novel technique to estimate the resonance frequency of LC chipless tags (inductorcapacitor parallel circuit) with improved sensitivity and linearity. The developed reader measures the power consumption of a Colpitts oscillator during a frequency sweep. The readout circuit consists of a Colpitts oscillator with a coil antenna, varactor diodes to change the oscillator frequency, analog circuitry to measure the power consumption and a microcontroller to control the whole system and send the data to a PC via USB. When an LC tag is inductively coupled to the oscillator, without contact, a maximum power peak is found. As shown by an experimental calibration using an LC tag made on FR4 substrate, the frequency of this maximum is related to the resonance frequency. Both parameters, power consumption and resonance frequency, present an excellent linear dependence with a high correlation factor (R 2 = 0.995). Finally, a screen-printed LC tag has been fabricated and used as relative humidity sensor achieving a sensitivity of (-2.41 ± 0.21) kHz/% with an R 2 of 0.946.

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Wireless Passive Temperature Sensor Realized on Multilayer HTCC Tapes for Harsh Environment

Cited by 34 publications

References 22 publications

La(Mg<sub>0.5−</sub><i><sub>x</sub></i>Me<i><sub>x</sub></i>Sn<sub>0.5</sub>)O<sub>3</sub>-based (Me = Ca, Sr) dielectric resonator antenna for use in a wireless high-temperature sensor

La(Mg<sub>0.5−</sub><i><sub>x</sub></i>Me<i><sub>x</sub></i>Sn<sub>0.5</sub>)O<sub>3</sub>-based (Me = Ca, Sr) dielectric resonator antenna for use in a wireless high-temperature sensor

Review of Research Status and Development Trends of Wireless Passive LC Resonant Sensors for Harsh Environments

Readout Circuit With Improved Sensitivity for Contactless LC Sensing Tags

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