Dielectric Characterization of Polyceram Films

1990 ◽  
Vol 180 ◽  
Author(s):  
G. Teowee ◽  
J.M. Boulton ◽  
H.H. Fox ◽  
A. Koussa ◽  
T. Gudgel ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Polyethylene Oxide ◽  
Dielectric Materials ◽  
Inorganic Materials ◽  
Functionalized Polymers ◽  
Multifunctional Materials ◽  
Dielectric Characterization ◽  
Silicon Alkoxides ◽  
Tan Δ

ABSTRACTPolycerams are an emergent class of hybrid, multifunctional materials which combine the properties of organic and inorganic materials. Films have been prepared from silicon alkoxides and reactive, functionalized polymers such as triethoxysilyl modified polybutadiene (MPBD), (N-triethoxysilylpropyl)O polyethylene oxide urethane (MPEOU) and trimethoxysilylpropyl substituted polyethyleneimine (MPEI). Characterization of dielectric constant and tan δ of the films has been carried out over a range of frequency from 500 Hz to 100 kHz; and the results are used to consider the potential of Polycerams as dielectric materials.

Bulk and In-Circuit Dielectric Characterization of LTCC Tape Systems Through Millimeter Wave Frequency Range

2011 ◽  
Vol 2011 (1) ◽  
pp. 000740-000746 ◽  
Author(s):  
Bradley Thrasher ◽  
Deepukumar Nair ◽  
James Parisi ◽  
Glenn Oliver ◽  
Michael A. Smith
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Millimeter Wave ◽  
Design Stage ◽  
Frequency Range ◽  
Dielectric Thickness ◽  
Dielectric Characterization ◽  
Wide Range ◽  
Comprehensive Characterization

Low Temperature Co-fired Ceramic (LTCC) material systems offer a highly versatile microwave and millimeter wave packaging platform. Extremely low microwave loss, excellent control of dielectric constant, uniform dielectric thickness, non-existent water absorption leading to very high hermeticity, ability to support multilayer structure leading to 3-dimensional packaging, ability to embed passive functions within the tape layers, availability of a wide range of metallizations, etc. are some of the key advantages of LTCC for microwave packaging. One of the important parameters which needs to be determined at the very early stages of circuit designs are the dielectric properties - dielectric constant and loss tangent, both of which are functions of frequency. These properties need to be known accurately over the entire frequency range of operation for the circuit. For LTCC based designs, the use of dielectric constant of bulk material can lead to deviations between the performance expected at the design stage and for the fabricated circuit. Such deviations are a significant concern for broadband circuits as well as for circuits with sharp resonant behavior such as filters. One of the significant sources of deviation between bulk LTCC and “in-circuit” dielectric constant is the nature of the thick film metallizations used in LTCC technology. Work described here is a comprehensive characterization of three DuPont™ GreenTape™ LTCC systems 951, 943, and 9K7 - in the frequency range 10 to 70 GHz. Both bulk and “in-circuit” dielectric properties with silver and gold metallizations are studied to quantify the deviations in dielectric properties. A Fabry-Perot open resonator technique is used for the bulk characterization while printed ring resonators are used for the in-circuit characterization. This comprehensive characterization will provide key design data for LTCC designers in the 10 – 70 GHz frequency range.

scholarly journals A Review of Sensing Strategies for Microwave Sensors Based on Metamaterial-Inspired Resonators: Dielectric Characterization, Displacement, and Angular Velocity Measurements for Health Diagnosis, Telecommunication, and Space Applications

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Lijuan Su ◽  
Javier Mata-Contreras ◽  
Paris Vélez ◽  
Ferran Martín
Keyword(s):  
Transmission Lines ◽  
Harmonic Signal ◽  
Dielectric Materials ◽  
Frequency Variation ◽  
Space Applications ◽  
Dielectric Characterization ◽  
Communication Circuits ◽  
Symmetry Properties ◽  
Microwave Sensors

Four sensing approaches for the implementation of microwave sensors based on transmission lines loaded with metamaterial-inspired resonators are considered in this review paper, and examples of applications are pointed out. In all the cases, sensing is based on the effects that the magnitude under measurement causes in the transmission properties of the resonator-loaded line. Such four strategies are (i) resonance frequency variation, (ii) coupling modulation through symmetry disruption (causing variation of the notch depth), (iii) frequency splitting (also exploiting symmetry properties), and (iv) amplitude modulation of a harmonic signal. Such sensors are useful in various scenarios, of interest in fields as diverse as characterization of dielectric materials for communication circuits, medical diagnosis and treatment with microwave technologies, and sensors for space applications, among others.

Fabrication and Dielectric Characterization of a Novel Polyimide

2013 ◽  
Vol 395-396 ◽  
pp. 29-32
Author(s):  
Jia Qi Lin ◽  
Pan Pan Zhang ◽  
Wen Long Yang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Loss Tangent ◽  
Pyromellitic Dianhydride ◽  
Dielectric Spectra ◽  
Dielectric Characterization

A novel polyimide (PI) films with three kinds of monomers was synthesized in this paper. The polyimide unit is derived from Pyromellitic dianhydride (PMDA), 3,3',4,4'-benzophenonetetracarboxylic dianhydride, (BTDA), and 4,4, -diaminodiphenyl ether (ODA). The dielectric properties of the films were measured. The dielectric spectra show that dielectric constant is about 3.7, which is larger than the PI with two kinds of monomers. In addition, the loss tangent and conductivity of the films is quite small, which is important for the practical use of them.

Bio Organic-Based Gate Dielectric Materials for Thin Film Transistors

2012 ◽  
Vol 1467 ◽  
Author(s):  
James G. Grote ◽  
Fahima Ouchen ◽  
Donna M. Joyce ◽  
Kristi M. Singh ◽  
Narayanan Venkat ◽  
...  
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Gate Dielectric ◽  
Variable Temperature ◽  
Thin Film Transistor ◽  
Dielectric Materials ◽  
Large Temperature ◽  
Hybrid Films ◽  
Dielectric Characterization ◽  
High Dielectric

ABSTRACTThe potential of bio-dielectrics for thin film transistor applications was explored via the incorporation of titanium dioxide (TiO2) nanoparticles, rutile form, a high dielectric constant (ε) ceramic, in the deoxyribonucleic acid (DNA) bio-polymer. The DNA-ceramic hybrid films were fabricated from stable suspensions of the TiO2 nanoparticles in viscous, aqueous DNA solutions. Dielectric characterization revealed that the incorporation of TiO2 in DNA resulted in enhanced dielectric constant (14.3 at 1 kHz for 40 wt % TiO2) relative to that of DNA in the entire frequency range of 1 kHz-1 MHz. Variable temperature dielectric measurements, in the 20-80°C range, of the DNA-TiO2 films revealed that the ceramic additive stabilizes DNA against large temperature dependent variations in both ε and the dielectric loss factor tan δ. The bulk resistivity of the DNA-TiO2 hybrid films was measured to be two to three orders of magnitude higher than that of the control DNA films, indicating their potential for utilization as insulating dielectrics in transistor and capacitor applications.

Coupled ring resonator for microwave characterization of dielectric materials

2012 ◽  
Vol 4 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Mahima Kapoor ◽  
K. S. Daya ◽  
G. S. Tyagi
Keyword(s):  
Dielectric Constant ◽  
Spirulina Platensis ◽  
Ring Resonator ◽  
Dielectric Materials ◽  
Split Ring Resonator ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Closed Ring

In this paper characterization of dielectric materials in liquid and powder phase using concentric closed and split ring resonators of length λ, λ/2, and λ/4 is reported. Experimental results have been validated by simulations and theoretically modeling. Sensitivity of the resonator with closed rings was maximum. Experimentally extracted values of dielectric constant of ferrite ranged from 14.05 to 15.1 with closed ring resonators and from 13.6 to 14.02 with split ring resonator, respectively. For spirulina platensis the dielectric constant was lying in the range 1.78–1.93 and 1.74–2.04 with closed ring and split ring resonators, respectively. The values extracted experimentally are in good agreement with simulation and theoretically found values. However, the values obtained from closed ring resonator were in agreement with the dielectric constant values of ferrite and spirulina platensis.

Fabrication and Characterization of Barium Strontium Titanate and Non-Ferroelectric Oxide Composites

1994 ◽  
Vol 360 ◽  
Author(s):  
E. Ngo ◽  
S. Stowell ◽  
L.C. Sengupta ◽  
M.E. O'day ◽  
R Lancto
Keyword(s):  
Dielectric Constant ◽  
Phased Array ◽  
Dielectric Constants ◽  
X Ray Diffraction ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Tan Δ ◽  
High Level ◽  
Oxide Composites

AbstractVarious composites of BSTO combined with other nonelectrically active oxide ceramics have been formulated. In general, the composites have adjustable electronic properties which can be tailored for use in various electronic devices. Two applications, which are of interest in regard to the composites being discussed here, are phased array antennas and capacitor-varistor monolithic devices. For the phased array antennas, these properties include reduced dielectric constants, ε′, where ε = ε′ - iε″, and loss tangents, tan δ. The reduction of the dielectric constant and lowering of the loss tangents reditce the overall impedance mismatch and the insertion loss of the device. In addition, the overall tunability, change in the dielectric constant with applied voltage, is maintained at a sufficiently high level for all dielectric constants of interest. Another application (for one of the composite materials) is a combined capacitorvaristor device. In general, this would be used to protect against spurious voltage surges and voltage transients in electronic micro-circuits. The microstructures, including grain size and phase analysis, have been examined using SEM and X-ray diffraction.

Structural and dielectric characterization of Ba4Nd2Ti4+xTa6−xO30−x/2 nonstoichiometric ceramics

2001 ◽  
Vol 16 (10) ◽  
pp. 2859-2863 ◽  
Author(s):  
X. M. Chen ◽  
X. H. Zheng ◽  
J. Wang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Temperature Coefficient ◽  
Partial Substitution ◽  
Dielectric Characterization ◽  
Low Dielectric ◽  
Dielectric Ceramics ◽  
Reduced Temperature

Ba4Nd2Ti4Ta6O30 dielectric ceramics with high-Ε and low dielectric loss were modified to improve the temperature coefficient of dielectric constant. Through partial substitution of Ti4+ for Ta5+, a significantly reduced temperature coefficient of dielectric constant (tΕ = –664p pm/°C) combined with a dielectric constant above 110 and a low dielectric loss (tanδ–0.0005 to 0.0006 at 1 MHz) resulted in the nonstoichiometric dielectric ceramics with nominal compositions Ba4Nd2Ti4+xTa6-xO30?x/2 (x = 0.8–1.2).

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.

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