High Temperature Characteristics of Coplanar Waveguide on <i>R</i>-Plane Sapphire and Alumina

Ponchak, George E.; Jordan, Jennifer L.; Scardelletti, Maximilian C.

doi:10.1109/tadvp.2008.2009123

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…The attenuation of the CPW lines gradually increases from 0.37 to 0.84 dB/cm as the temperature increase from 25 to 400 C. increases from 5.4 to 6, approximately 10%, over the same temperature range. This is agreeable with [9], [10] when taking into account the metal cladding thickness.…”

Section: Resultssupporting

confidence: 88%

Temperature Dependency (25 <spl deg>C - 400 <spl deg>C) of a Planar Folded Slot Antenna on Alumina Substrate

Scardelletti

Jordan

Ponchak

2008

Antennas Wirel. Propag. Lett.

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The dependency of planar folded slot antenna characteristics fabricated on alumina substrates over the temperature range of 25 to 400 C are presented. The 3.575 GHz antenna is fed by a 20 mm long, 50 CPW line (S = 130 and W = 60 m),and there is no ground plane on the back side of the substrate. An on-wafer TRL calibration was used to deembed the CPW feed line for return loss measurements and to measure the increase in the effective dielectric constant and attenuation of the CPW lines as a function of temperature. The measured antenna characteristics show that the resonant frequency varies by less than 1%, the minimum return loss increases from 11 to 16 dB, the quality factor increases from 25.5 to 44.75, and the gain decreases by 1 dBi as temperature is increased from 25 C to 400 C. Finally, the effect of the measurement test setup on the measured radiation patterns is discussed.Index Terms-Absolute gain, alumina, folded slot antenna, high temperature, return loss.

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Section: Resultssupporting

confidence: 88%

Temperature Dependency (25 <spl deg>C - 400 <spl deg>C) of a Planar Folded Slot Antenna on Alumina Substrate

Scardelletti

Jordan

Ponchak

2008

Antennas Wirel. Propag. Lett.

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“…In this case, the antenna is epoxied to an alumina substrate with no ground plane. The alumina substrate is chosen due to its ability to withstand high temperatures [11,12]. The chip antenna with coplanar waveguide (CPW) feed line and matching network is shown in Fig.…”

Section: Chip Antennamentioning

confidence: 99%

Wireless capacitive pressure sensor with directional RF chip antenna for high temperature environments

Scardelletti

Jordan

Ponchak

et al. 2015

2015 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)

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This paper presents the design, fabrication and characterization of a wireless capacitive pressure sensor with directional RF chip antenna that is envisioned for the health monitoring of aircraft engines operating in harsh environments. The sensing system is characterized from room temperature (25ºC) to 300°C for a pressure range from 0 to 100 psi. The wireless pressure system consists of a Clapp-type oscillator design with a capacitive MEMS pressure sensor located in the LC-tank circuit of the oscillator. Therefore, as the pressure of the aircraft engine changes, so does the output resonant frequency of the sensing system. A chip antenna is integrated to transmit the system output to a receive antenna 10 m away.The design frequency of the wireless pressure sensor is 127 MHz and a 2% increase in resonant frequency over the temperature range of 25 to 300 ºC from 0 to 100 psi is observed. The phase noise is less than -30 dBc/Hz at the 1 kHz offset and decreases to less than -80 dBc/Hz at 10 kHz over the entire temperature range. The RF radiation patterns for two cuts of the wireless system have been measured and show that the system is highly directional and the MEMS pressure sensor is extremely linear from 0 to 100 psi. KEYWORDSWireless capacitive pressure sensor system, MEMS, chip antenna, passive and active components, high temperature applications, health monitoring.

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Terahertz time domain spectroscopy of amorphous and crystalline aluminum oxide nanostructures synthesized by thermal decomposition of AACH

Mehboob

Mehmood

Ahmed

et al. 2017

Materials Chemistry and Physics

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High Temperature Characteristics of Coplanar Waveguide on R-Plane Sapphire and Alumina

Abstract: Abstract-This

Cited by 10 publications

References 27 publications

Temperature Dependency (25 <spl deg>C - 400 <spl deg>C) of a Planar Folded Slot Antenna on Alumina Substrate

Temperature Dependency (25 <spl deg>C - 400 <spl deg>C) of a Planar Folded Slot Antenna on Alumina Substrate

Wireless capacitive pressure sensor with directional RF chip antenna for high temperature environments

Terahertz time domain spectroscopy of amorphous and crystalline aluminum oxide nanostructures synthesized by thermal decomposition of AACH

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