Passive Microwave Substrate Integrated Cavity Resonator for Humidity Sensing

Matbouly, Hatem El; Boubekeur, N.; Domingue, Frédéric

doi:10.1109/tmtt.2015.2495346

Cited by 75 publications

(31 citation statements)

References 14 publications

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“…Many types of microwave sensors have been used in different applications such as planar microstrip resonators for liquid [5], solid [6][7][8] and Petroleum oils [9,10] characterization. Substrate integrated waveguide (SIW) technique has been used for liquid [11] and humidity [12] detection. These sensors have several advantages such as low manufacturing cost and simple to design.…”

Section: Introductionmentioning

confidence: 99%

Analysis and investigation of a novel microwave sensor with high Q-factor for liquid characterization

Alhegazi¹,

Zakaria²,

Shairi³

et al. 2019

TELKOMNIKA

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In this paper, a new design of microwave sensor with high Q-factor for liquid characterization is analyzed and investigated. The new microwave sensor is based on a gap waveguide cavity resonator (GWCR). The GWCR consists of upper plate, lower plate and array of pins on the lower plate. The liquid under test (LUT) is characterized by placing it inside the GWCR where the electric field concentrates using a quartz capillary that is passing through microfluidic channels. The results show that the proposed sensor has a high Q-factor of 4832. Moreover, the proposed sensor has the ability to characterize different types of liquids such as oils, ethanol, methanol and distilled water. The polynomial fitting method is used to extract the equation of the unknown permittivity of the LUT. The results show that the evaluated permittivity using the proposed sensor has a good agreement with the reference permittivity. Therefore, the proposed sensor is a good candidate for food and pharmaceutical applications.

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Section: Introductionmentioning

confidence: 99%

Analysis and investigation of a novel microwave sensor with high Q-factor for liquid characterization

Alhegazi¹,

Zakaria²,

Shairi³

et al. 2019

TELKOMNIKA

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“…State-of-the-art chemical sensors based on the SIW structure are discussed in this paragraph. In [ 30 ], a high quality factor (Q ≈ 300) SIW was proposed as a microwave humidity sensor. The functionalized region was introduced on the highest E-field region using air holes.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Detection of Two Chemicals Using a TE20-Mode Substrate-Integrated Waveguide Resonator

Salim

Memon

Lim

2018

Sensors

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Microwave resonators working as sensors can detect only a single analyte at a time. To address this issue, a TE20-mode substrate-integrated waveguide (SIW) resonator is exploited, owing to its two distinct regions of high-intensity electric fields, which can be manipulated by loading two chemicals. Two microfluidic channels with unequal fluid-carrying capacities, engraved in a polydimethylsiloxane (PDMS) sheet, can perturb the symmetric electric fields even if loaded with the two extreme cases of dielectric [ethanol (E), deionized water (DI)] and [deionized water, ethanol]. The four layers of the sandwiched structure considered in this study consisted of a top conductive pattern and a bottom ground, both realized on a Rogers RT/Duroid 5880. PDMS-based channels attached with an adhesive serve as the middle layers. The TE20-mode SIW with empty channels resonates at 8.26 GHz and exhibits a −25 dB return loss with an unloaded quality factor of Q ≈ 28. We simultaneously load E and DI and demonstrate the detection of the four possible combinations: [E, DI], [DI, E], [E, E], and [DI, DI]. The performance of our proposed method showed increases in sensitivity (MHz/εr) of 7.5%, 216%, and 1170% compared with three previously existing multichannel microwave chemical sensors.

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“…A strong E-field (energy) centered at the SIW cavity can be utilized for various sensing applications. A high quality-factor (Q ≈ 300) SIW-based microwave humidity sensor has been proposed [ 7 ]. To realize a functionalized region on the SIW, air holes were introduced on the strongest E-field.…”

Section: Introductionmentioning

confidence: 99%

TM02 Quarter-Mode Substrate-Integrated Waveguide Resonator for Dual Detection of Chemicals

Salim

Lim

2018

Sensors

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The detection of multiple fluids using a single chip has been attracting attention recently. A TM02 quarter-mode substrate-integrated waveguide resonator designed at 5.81 GHz on RT/duroid 6010LM with a return loss of 13 dB and an unloaded quality factor of Q ≈ 13 generates two distinct strong electric fields that can be manipulated to simultaneously detect two chemicals. Two asymmetric channels engraved in a polydimethylsiloxane sheet are loaded with analyte to produce a unique resonance frequency in each case, regardless of the dielectric constants of the liquids. Keeping in view the nature of lossy liquids such as ethanol, the initial structure and channels are optimized to ensure a reasonable return loss even in the case of loading lossy liquids. After loading the empty channels, Q is evaluated as 43. Ethanol (E) and deionized water (DI) are simultaneously loaded to demonstrate the detection of all possible combinations: [Air, Air], [E, DI], [DI, E], [E, E], and [DI, DI]. The proposed structure is miniaturized while exhibiting a performance comparable to that of existing multichannel microwave chemical sensors.

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Passive Microwave Substrate Integrated Cavity Resonator for Humidity Sensing

Cited by 75 publications

References 14 publications

Analysis and investigation of a novel microwave sensor with high Q-factor for liquid characterization

Analysis and investigation of a novel microwave sensor with high Q-factor for liquid characterization

Simultaneous Detection of Two Chemicals Using a TE20-Mode Substrate-Integrated Waveguide Resonator

TM02 Quarter-Mode Substrate-Integrated Waveguide Resonator for Dual Detection of Chemicals

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