Article (Scientific journals)
Design and Optimization of Microwave Sensor for the Non-Contact Measurement of Pure Dielectric Materials
Ali, Luqman; Wang, Cong; Ullah, Inam et al.
2021In Electronics
Peer reviewed
 

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Keywords :
Microwave sensors; Pure Dielectric Materials; Optimization
Abstract :
[en] This article presents an optimized microwave sensor for the non-contact measurement of complex permittivity and material thickness. The layout of the proposed sensor comprises the parallel combination of an interdigital capacitor (IDC) loaded at the center of the symmetrical differential bridge-type inductor fabricated on an RF-35 substrate (εr = 3.5 and tanδ = 0.0018). The bridge-type differential inductor is introduced to obtain a maximum inductance value with high quality (Q) factor and low tunable resonant frequency. The central IDC structure is configured as a spur-line structure to create a high-intensity coupled electric field (e-field) zone, which significantly interacts with the materials under test (MUTs), resulting in an increased sensitivity. The proposed sensor prototype with optimized parameters generates a resonant frequency at 1.38 GHz for measuring the complex permittivity and material thickness. The experimental results indicated that the resonant frequency of the designed sensor revealed high sensitivities of 41 MHz/mm for thickness with a linear response (r2 = 0.91567), and 53 MHz/Δεr for permittivity with a linear response (r2 = 0.98903). The maximum error ratio for measuring MUTs with a high gap of 0.3 mm between the testing sample and resonator is 6.52%. The presented performance of the proposed sensor authenticates its application in the non-contact measurement of samples based on complex permittivity and thickness.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Ali, Luqman
Wang, Cong
Ullah, Inam
Yousaf, Adnan
KHAN, Wali Ullah  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Ullah, Shafi
Khan, Rahim
Alassery, Fawaz
Hamam, Habib
Shafiq, Muhammad
External co-authors :
yes
Language :
English
Title :
Design and Optimization of Microwave Sensor for the Non-Contact Measurement of Pure Dielectric Materials
Alternative titles :
[en] Design and Optimization of Microwave Sensor for the Non-Contact Measurement of Pure Dielectric Materials
Publication date :
December 2021
Journal title :
Electronics
eISSN :
2079-9292
Publisher :
Multidisciplinary Digital Publishing Institute (MDPI), Basel, Switzerland
Peer reviewed :
Peer reviewed
Focus Area :
Security, Reliability and Trust
Available on ORBilu :
since 25 January 2023

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