scholarly journals High-Sensitivity Microwave Sensor Based on An Interdigital-Capacitor-Shaped Defected Ground Structure for Permittivity Characterization

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 498 ◽  
Author(s):  
Junho Yeo ◽  
Jong-Ig Lee
Keyword(s):  
High Sensitivity ◽  
Dielectric Constants ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Ridge Structure ◽  
Dielectric Characterization ◽  
Interdigital Capacitor ◽  
Double Ring ◽  
Microwave Sensor ◽  
Single Ring

This study proposes a high-sensitivity microwave sensor based on an interdigital-capacitor-shaped defected ground structure (IDCS-DGS) in a microstrip transmission line for the dielectric characterization of planar materials. The proposed IDCS-DGS was designed by modifying the straight ridge structure of an H-shaped aperture. The proposed sensor was compared with conventional sensors based on a double-ring complementary split ring resonator (CSRR), a single-ring CSRR, and a rotated single-ring CSRR. All the sensors were designed and fabricated on 0.76-mm-thick RF-35 substrate and operated at 1.5 GHz under unloaded conditions. Five different standard dielectric samples with dielectric constants ranging from 2.17 to 10.2 were tested for the sensitivity comparison. The sensitivity of the proposed sensor was measured by the shift in the resonant frequency of the transmission coefficient, and compared with conventional sensors. The experiment results show that the sensitivity of the proposed sensor was two times higher for a low permittivity of 2.17 and it was 1.42 times higher for a high permittivity of 10.2 when compared with the double-ring CSRR-based sensor.

scholarly journals Design of a High-Sensitivity Microstrip Patch Sensor Antenna Loaded with a Defected Ground Structure Based on a Complementary Split Ring Resonator

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7064
Author(s):  
Junho Yeo ◽  
Jong-Ig Lee
Keyword(s):  
Resonant Frequency ◽  
Patch Antenna ◽  
Relative Permittivity ◽  
Patch Size ◽  
Dielectric Constants ◽  
Patch Antennas ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Split Ring ◽  
Resonant Frequencies

A comparative study to determine the most highly sensitive resonant frequency among the first four resonant frequencies of a conventional patch antenna and defected ground structure (DGS)-loaded patch antennas using commonly used DGS geometries in the literature, such as a rectangular slit, single-ring complementary split ring resonators (CSRRs) with different split positions, and double-ring CSRRs (DR-CSRRs) with different locations below the patch, for relative permittivity measurement of planar materials was conducted. The sensitivity performance for placing the DGS on two different locations, a center and a radiating edge of the patch, was also compared. Finally, the effect of scaling down the patch size of the DGS-loaded patch antenna was investigated in order to enhance the sensitivities of the higher order resonant frequencies. It was found that the second resonant frequency of the DR-CSRR DGS-loaded patch antenna aligned on a radiating edge with a half scaled-down patch size shows the highest sensitivity when varying the relative permittivity of the material under test from 1 to 10. In order to validate the simulated performance of the proposed antenna, the conventional and the proposed patch antennas were fabricated on 0.76-mm-thick RF-35 substrate, and they were used to measure their sensitivity when several standard dielectric substrate samples with dielectric constants ranging from 2.17 to 10.2 were loaded. The measured sensitivity of the second resonant frequency for the proposed DGS-loaded patch antenna was 4.91 to 7.72 times higher than the first resonant frequency of the conventional patch antenna, and the measured performance is also slightly better compared to the patch antenna loaded with a meander-line slot on the patch.

High-Q Active Microwave Sensor Based on Microstrip Complementary Split-Ring Resonator (MCSRR) Structure for Dielectric Characterization

2021 ◽  
Vol 36 (7) ◽  
pp. 922-927
Author(s):  
Hong-Yi Gan ◽  
Wen-Sheng Zhao ◽  
Da-Wei Wang ◽  
Jing Wang ◽  
Qi Liu ◽  
...  
Keyword(s):  
Quality Factor ◽  
Ring Resonator ◽  
High Sensitivity ◽  
Dielectric Materials ◽  
Negative Resistance ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Dielectric Characterization ◽  
Complementary Split Ring Resonator ◽  
Microwave Sensor

This paper presents an active microwave sensor for the characterization of dielectric materials. The sensor is consisted of a microstrip complementary split-ring resonator (MCSRR) structure and an active feedback loop. The loop uses an amplifier to generate negative resistance to compensate the resonator’s loss and increase the loaded quality factor. The developed sensor possesses the advantages of high quality factor, ultra-small electrical size, and high sensitivity. A prototype of the sensor is fabricated and measured for validation.

scholarly journals Differential microwave sensor based on microstrip lines loaded with a split-ring resonator for dielectric characterization of materials

2021 ◽  
Vol 2118 (1) ◽  
pp. 012004
Author(s):  
J Zapata-Londoño ◽  
F Umaña-Idárraga ◽  
J Morales-Guerra ◽  
S Arias-Gómez ◽  
C Valencia-Balvin ◽  
...  
Keyword(s):  
Ring Resonator ◽  
High Sensitivity ◽  
Dielectric Materials ◽  
Split Ring Resonator ◽  
Label Free ◽  
Split Ring ◽  
Total Size ◽  
Dielectric Characterization ◽  
Microwave Sensor

Abstract In this work, we propose a microwave sensor that allows the characterization of dielectric materials based on a differential configuration. A microstrip permittivity sensor of the surrounding material is proposed using a split ring-resonator to measure differentially. The geometry was optimized and was numerically analyzed using CST STUDIO. The numerical analysis of the metamaterial unit cells is carried out first, to determine the operating band. After that, the metamaterial cell was employed to design the differential microstrip permittivity sensor. The obtained results reveal that the proposed sensor has the capability to characterize different materials whose relative dielectric permittivity’s are in the range of 9.8 to 80 with great performance. The device has a total size of 86 mm × 60 mm and operates around 3 GHz. In this band, the sensor reaches a sensibility of 2.89 MHz and a Q-factor of 70.15. Thus, this work shows a compact, reusable, label-free, and non-destructive microwave sensing device and paves the way for high accuracy sensing of the dielectric properties of different materials due to its high- Q-factor as well as high sensitivity.

scholarly journals High-Sensitivity Microwave Sensor for Liquid Characterization Using a Complementary Circular Spiral Resonator

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 787 ◽  
Author(s):  
Xingyun Zhang ◽  
Cunjun Ruan ◽  
Tanveer Haq ◽  
Kanglong Chen
Keyword(s):  
Parabolic Equations ◽  
High Frequency ◽  
Low Cost ◽  
High Sensitivity ◽  
Approximate Model ◽  
Dielectric Constants ◽  
Square Channel ◽  
Cost System ◽  
Microwave Sensor ◽  
Existing Data

This paper describes a low-cost, small size, and high-sensitivity microwave sensor using a Complementary Circular Spiral Resonator (CCSR), which operates at around 2.4 GHz, for identifying liquid samples and determining their dielectric constants. The proposed sensor was fabricated and tested to effectively identify different liquids commonly used in daily life and determine the concentrations of various ethanol–water mixtures at by measuring the resonant frequency of the CCSR. Using acrylic paint, a square channel was drawn at the most sensitive position of the microwave sensor to ensure accuracy of the experiment. To estimate the dielectric constants of the liquids under test, an approximate model was established using a High-Frequency Simulator Structure (HFSS). The results obtained agree very well with the existing data. Two parabolic equations were calculated and fitted to identify unknown liquids and determine the concentrations of ethanol–water mixtures. Thus, our microwave sensor provides a method with high sensitivity and low consumption of material for liquid monitoring and determination, which proves the feasibility and broad prospect of this low-cost system in industrial application.

scholarly journals Compact Wideband BPF With Wide Stopband Using Substrate Integrated Defected Ground Structure

2021 ◽  
Vol 31 (4) ◽  
pp. 353-356
Author(s):  
Jie Zhou ◽  
Yunbo Rao ◽  
Dongxia Yang ◽  
Huizhen Jenny Qian ◽  
Xun Luo
Keyword(s):  
Defected Ground Structure ◽  
Ground Structure
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