scholarly journals High-Precision Complementary Metamaterial Sensor Using Slotted Microstrip Transmission Line

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Abdul Samad ◽  
Wei Dong Hu ◽  
Waseem Shahzad ◽  
Leo. P. Ligthart ◽  
Hamid Raza
Keyword(s):  
Dielectric Properties ◽  
Resonant Frequency ◽  
Transmission Line ◽  
Dielectric Materials ◽  
Compact Structure ◽  
Microstrip Transmission Line ◽  
Left Handed ◽  
Microwave Sensor ◽  
Constitutive Parameters

Metamaterial-based microwave sensor having novel and compact structure of the resonators and the slotted microstrip transmission line is proposed for highly precise measurement of dielectric properties of the materials under test (MUTs). The proposed sensor is designed and simulated on Rogers’ substrate RO4003C by using the ANSYS HFSS software. A single and accumulative notch depth of -44.29 dB in the transmission coefficient ( S 21 ) is achieved at the resonant frequency of 5.15 GHz. The negative constitutive parameters (permittivity and permeability) are extracted from the S -parameters which are the basic property of metamaterials or left handed materials (LHMs). The proposed sensor is fabricated and measured through the PNA-X (N5247A). The sensitivity analysis is performed by placing various standard dielectric materials onto the sensor and measuring the shift in the resonant frequencies of the MUTs. A parabolic equation of the proposed sensor is formulated to approximate the resonant frequency and the relative permittivity of the MUTs. A very strong agreement among the simulated, measured, and calculated results is found which reveals that the proposed sensor is a highly precise sensor for the characterization of dielectric properties of the MUTs. Error analysis is performed to determine the accuracy of the proposed sensor. A very small percentage of error (0.81%) and a very low standard deviation are obtained which indicate high accuracy of the proposed sensor.

scholarly journals Complex Permittivity Characterization of Liquid Samples Based on a Split Ring Resonator (SRR)

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3385
Author(s):  
Jialu Ma ◽  
Jingchao Tang ◽  
Kaicheng Wang ◽  
Lianghao Guo ◽  
Yubin Gong ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Complex Permittivity ◽  
Ring Resonator ◽  
High Sensitivity ◽  
Split Ring Resonator ◽  
Debye Model ◽  
Split Ring ◽  
Liquid Samples ◽  
Microwave Sensor

A complex permittivity characterization method for liquid samples has been proposed. The measurement is carried out based on a self-designed microwave sensor with a split ring resonator (SRR), the unload resonant frequency of which is 5.05 GHz. The liquid samples in capillary are placed in the resonant zone of the fabricated senor for high sensitivity measurement. The frequency shift of 58.7 MHz is achieved when the capillary is filled with ethanol, corresponding a sensitivity of 97.46 MHz/μL. The complex permittivity of methanol, ethanol, isopropanol (IPA) and deionized water at the resonant frequency are measured and calibrated by the first order Debye model. Then, the complex permittivity of different concentrations of aqueous solutions of these materials are measured by using the calibrated sensor system. The results show that the proposed sensor has high sensitivity and accuracy in measuring the complex permittivity of liquid samples with volumes as small as 0.13 μL. It provides a useful reference for the complex permittivity characterization of small amount of liquid chemical samples. In addition, the characterization of an important biological sample (inositol) is carried out by using the proposed sensor.

scholarly journals Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1066 ◽  
Author(s):  
Amir Ebrahimi ◽  
Grzegorz Beziuk ◽  
James Scott ◽  
Kamran Ghorbani
Keyword(s):  
Dielectric Properties ◽  
Transmission Line ◽  
Reference Sample ◽  
Solid Materials ◽  
Microstrip Transmission Line ◽  
Frequency Splitting ◽  
Metallic Wall ◽  
Lc Resonator ◽  
Lc Resonators

A differential microwave permittivity sensor and comparator is designed using a microstrip transmission line loaded with a magnetic-LC resonator. The microstrip transmission line is aligned with the electric wall of the resonator. The sensor shows a single transmission zero, when it is unloaded or loaded symmetrically on both halves. A second notch appears in the transmission response by asymmetrical dielectric loading on the two halves of the device. The frequency splitting is used to characterize the dielectric properties of the samples under test. The sensitivity of the sensor is enhanced by removing the mutual coupling between the two halves of the magnetic-LC resonator using a metallic wall. The sensors’ operation principle is explained through a circuit model analysis. A prototype of the designed sensor is fabricated and measurements are used for validation of the sensing concept. The sensor can be used for determination of the dielectric properties in solid materials or detecting defects and impurities in solid materials through a comparative measurement with a reference sample.

Comparison between crystal structure and dielectric properties Nd(Mg1/2Ti1/2)O3 (NMT) and Nd(Zn1/2Ti1/2)O3 (NZT)

2021 ◽  
pp. 2150370
Author(s):  
Kouros Khamoushi ◽  
Vojislav V. Mitic ◽  
Jelena Manojlovic ◽  
Vesna Paunovic ◽  
Zlata Cvetkovic ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Resonant Frequency ◽  
Titanium Oxide ◽  
Single Phase ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
Positive Temperature ◽  
High Property ◽  
High Relative Permittivity ◽  
Very High

The dielectric properties of Neodymium zinc titanium oxide (NZT) and Neodymium magnesium titanium oxide (NMT) were investigated. The single-phase ceramic was synthesized at various temperatures below 1650[Formula: see text]C. The result shows that the value of temperature of resonant frequency [Formula: see text] for NMT is higher than NZT. Our findings also indicate that the rare earth materials produce high property dielectric materials, despite the fact some elements produce lower negative value of temperature of resonant frequency [Formula: see text]. By doping a compound such as CaTiO3 which has a very positive temperature of resonant frequency ([Formula: see text] ppm/[Formula: see text]C) and a very high relative permittivity [Formula: see text], it is possible to tune NZT and MNT to achieve an excellent dielectric material. This work is under consideration. The results of this scientific research could be very important for modern advance applications in microelectronic miniaturization.

scholarly journals Preparation and Characterization of Pure Organic Dielectric Composites for Capacitors

2018 ◽  
Vol 160 ◽  
pp. 03002
Author(s):  
Xin Mao ◽  
Jinliang Lv ◽  
Fangfang Zhang ◽  
Bo Wu ◽  
Jie Yang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Dielectric Properties ◽  
Vinylidene Fluoride ◽  
Dielectric Materials ◽  
Excellent Thermal Stability ◽  
Solution Blending ◽  
Thermal Imidization ◽  
Poly Vinylidene Fluoride ◽  
Organic Dielectric

This work reports the excellent dielectric composites were prepared from polyimide (PI) and poly(vinylidene fluoride) (PVDF) via solution blending and thermal imidization or chemical imidization. The dielectric and thermal properties of the composites were studied. Results indicated that the dielectric properties of the composites synthesized by these two methods were enhanced through the introduction of PVDF, and the composites exhibited excellent thermal stability. Compared to the thermal imidization, the composites prepared by chemical imidization exhibited superior dielectric properties. This study demonstrated that the PI/PVDF composites were potential dielectric materials in the field of electronics.

Electro-Optic Characterization of Microwave Standing Waves in a GaAs Transmission Line by Using a Novel Phase Analyzing Technique

1997 ◽  
Vol 08 (04) ◽  
pp. 719-732 ◽  
Author(s):  
Ci-Ling Pan ◽  
Gong-Ru Lin ◽  
Jia-Min Shieh ◽  
Chia-Wen Tsai ◽  
S.-C. Wang ◽  
...  
Keyword(s):  
Transmission Line ◽  
Standing Wave ◽  
Theoretical Models ◽  
Phase Lock Loop ◽  
Phase Component ◽  
Microstrip Transmission Line ◽  
Electro Optic ◽  
Wave Patterns ◽  
Good Agreement

We demonstrate an accurate, non-contact and compact characterization technique for measuring both the amplitude and phase component of microwave standing-wave patterns in a GaAs microstrip transmission line. A laser-diode-based optoelectronic phase lock loop was employed as a phase-referencing scheme. Key parameters such as voltage standing-wave ratio and reflection coefficient for a GaAs microstrip transmission line were determined up to 16 GHz. Dispersion charateristics were found in good agreement with selected theoretical models.

Characterization of Al-Based High-k Stacked Dielectric Layers Deposited on 4H-SiC by Atomic Layer Deposition

2011 ◽  
Vol 679-680 ◽  
pp. 441-444 ◽  
Author(s):  
Muhammad Usman ◽  
T. Pilvi ◽  
Markku Leskelä ◽  
Adolf Schöner ◽  
Anders Hallén
Keyword(s):  
Dielectric Properties ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Dielectric Materials ◽  
Dielectric Layers ◽  
Layer Deposition ◽  
High K ◽  
Current Voltage ◽  
High K Dielectric

Aluminum-based high-k dielectric materials have been studied for their potential use as passivation for SiC devices. Metal-insulator-semiconductor structures were prepared and their dielectric properties were analyzed using capacitance-voltage and current-voltage measurements. Atomic layer deposition was used for the deposition of dielectric layers consisting of AlN with or without a buffer layer of SiO2, and also a stack of alternating AlN and Al2O3 layers. It has been observed that AlN has a polycrystalline structure which provides leakage paths for the current through the grain boundaries. However, adding alternate amorphous layers of Al2O3 prevent this leakage and give better overall dielectric properties. It is also concluded that the breakdown of the dielectric starts from the degradation of the thin interfacial SiO2 layer.

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