Miniaturized Humidity Sensor Based on a Partially Air-Filled Slow-Wave SIW Resonator

TuHo, Anh; Ndoye, Majid; Ferrari, Philippe; Domingue, Frédéric; Pistono, Emmanuel

doi:10.23919/eumc.2018.8541395

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The passive microwave sensor can not only be conveniently applied to RF sensing systems, but also offers the merits of low cost, high design flexibility, and freedom from a power supply. Thus far, a number of passive microwave RH sensing schemes have been reported [14,15,16,17,18,19,20,21,22,23,24,25,26]. One branch of this research concentrates on the synthesis of novel sensing materials and their combinations with diverse microwave components; it is dedicated to improving the sensing performance of sensors (e.g., sensitivity, resolution, etc.).…”

Section: Introductionmentioning

confidence: 99%

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A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing

Wei

Huang

et al. 2019

Sensors

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In this study, an ultra-compact humidity sensor based on a double-folded substrate integrated waveguide (SIW) re-entrant cavity was proposed and analyzed. By folding a circular re-entrant cavity twice along its two orthogonally symmetric planes, the designed structure achieved a remarkable size reduction (up to 85.9%) in comparison with a conventional TM010-mode circular SIW cavity. The operating principle of the humidity sensor is based on the resonant method, in other words, it utilizes the resonant properties of the sensor as signatures to detect the humidity condition of the ambient environment. To this end, a mathematical model quantitatively relating the resonant frequency of the sensor and the relative humidity (RH) level was established according to the cavity perturbation theory. The sensing performance of the sensor was experimentally validated in a RH range of 30%–80% by using a humidity chamber. The measured absolute sensitivity of the sensor was calculated to be 135.6 kHz/%RH, and the corresponding normalized sensitivity was 0.00627%/%RH. It was demonstrated that our proposed sensor not only has the merits of compact size and high sensitivity, but also benefits from a high Q-factor and ease of fabrication and integration. These advantages make it an excellent candidate for humidity sensing applications in various fields such as the agricultural, pharmaceutical, and food industries.

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Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the effective RH sensing ranges of these sensors may also be limited by the sensing materials, which hinders their practical applications to some extent. Therefore, remarkable efforts have been devoted to develop RH sensors using novel, passive microwave structures without sensing materials [22,23,24,25,26].…”

Section: Introductionmentioning

confidence: 99%

A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing

Wei

Huang

et al. 2019

Sensors

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Empty Substrate‐Integrated Waveguides: A Low‐Cost and Low‐Profile Alternative for High‐Performance Microwave Devices

Belenguer

Esteban

Borja

et al. 2020

Wiley Encyclopedia of Electrical and Electronics Engineering

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The new communication systems demand low‐cost, low‐profile, low‐weight, and high‐performance components (filters, diplexers, power dividers, antennas, etc.). Classical microwave technologies are either high performance but bulky and expensive (rectangular waveguides) or low cost and low profile but with poor performance (planar lines such as microstrip). Recently, an alternative has appeared by implementing a sort of rectangular waveguide embedded in a printed circuit board. It is the substrate‐integrated waveguide. Many attention has been given to this technology, but its performance can be further improved if the dielectric is removed and the fields propagate through air. So, several types of the so‐called empty substrate‐integrated waveguides have recently appeared, providing with very promising solutions for low‐cost and low‐profile devices with performance close to that of the classical rectangular waveguides.This article presents all the advances up to date in the field of empty substrate‐integrated waveguides, comparing all those solutions and assessing their potential for implementing high‐quality and low‐cost microwave devices.

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Design and Simulation of Microstrip Based IDC Humidity Sensor

Arif

Alam

Ansari

et al. 2022

2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)

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Miniaturized Humidity Sensor Based on a Partially Air-Filled Slow-Wave SIW Resonator

Cited by 3 publications

References 9 publications

A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing

A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing

Empty Substrate‐Integrated Waveguides: A Low‐Cost and Low‐Profile Alternative for High‐Performance Microwave Devices

Design and Simulation of Microstrip Based IDC Humidity Sensor

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