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Employing higher order modes in a broadband SIW sensor for permittivity measurement of medium loss materials

Published online by Cambridge University Press:  14 October 2020

Kianoosh Kazemi Open the ORCID record for Kianoosh Kazemi [Opens in a new window] ,
Gholamreza Moradi  and
Ayaz Ghorbani
Kianoosh Kazemi
Affiliation:
Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, Iran
Gholamreza Moradi*
Affiliation:
Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, Iran
Ayaz Ghorbani
Affiliation:
Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, Iran
*
Author for correspondence: Gholamreza Moradi, E-mail: ghmoradi@aut.ac.ir.com
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Abstract

In this paper, a novel SIW microwave sensor is designed to accurately determine the broadband complex permittivity of medium loss and dispersive liquids using a number of higher order modes in 11–20 GHz. To achieve a higher accuracy in characterization, the sensor is equipped with some methods such as Photonic Band Gap method, slow-wave via, and a new feedline, which enhances the quality factor for the higher order TE1,0,n modes. The operating principle of this sensor is based on the cavity perturbation technique, in which the resonant properties of the cavity are utilized to extract the dielectric properties of liquid under test. To provide a method to decrease the LUT consumption, a winding microfluidic channel is designed and embedded in the cavity. The channel increases the interaction between the induced electric field and the LUT. The accuracy of different perturbation technique for determination of permittivity is compared with each other.

Keywords

Cavity sensorcomplex permittivitymulti-modeperturbation techniqueSIW
Type
Microwave Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 8 , October 2021 , pp. 766 - 778
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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