Testing dielectric properties of tissue-equivalent liquid using open-ended coaxial line technique based on the transverse electromagnetic model

2014 ◽  
Author(s):  
Kang Zhang ◽  
Tong Wu ◽  
Jun-heng Teng
Keyword(s):  
Dielectric Properties ◽  
Coaxial Line ◽  
Electromagnetic Model ◽  
Tissue Equivalent ◽  
Transverse Electromagnetic

scholarly journals A Linear Microwave Plasma Source Using a Circular Waveguide Filled with a Relatively High-Permittivity Dielectric: Comparison with a Conventional Quasi-Coaxial Line Waveguide

2021 ◽  
Vol 11 (12) ◽  
pp. 5358
Author(s):  
Ju-Hong Cha ◽  
Sang-Woo Kim ◽  
Ho-Jun Lee
Keyword(s):  
Electron Density ◽  
Microwave Plasma ◽  
Circular Waveguide ◽  
Coaxial Line ◽  
Plasma Source ◽  
Tangential Plane ◽  
High Permittivity ◽  
Deposition Area ◽  
Extended Plasma ◽  
Transverse Electromagnetic

For a conventional linear microwave plasma source (LMPS) with a quasi-coaxial line transverse electromagnetic (TEM) waveguide, a linearly extended plasma is sustained by the surface wave outside the tube. Due to the characteristics of the quasi-coaxial line MPS, it is easy to generate a uniform plasma with radially omnidirectional surfaces, but it is difficult to maximize the electron density in a curved selected region. For the purpose of concentrating the plasma density in the deposition area, a novel LMPS which is suitable for curved structure deposition has been developed and compared with the conventional LMPS. As the shape of a circular waveguide, it is filled with relatively high-permittivity dielectric instead of a quasi-coaxial line waveguide. Microwave power at 2.45 GHz is transferred to the plasma through the continuous cylindrical-slotted line antenna, and the radiated electric field in the radial direction is made almost parallel to the tangential plane of the window surface. This research includes the advanced 3D numerical analysis and compares the results with the experiment. It shows that the electron density in the deposition area is higher than that of the conventional quasi-coaxial line plasma MPS.

Technique for Measuring the Dielectric Properties of Minerals as a Function of Temperature and Density at Microwave Heating Frequencies

1990 ◽  
Vol 189 ◽  
Author(s):  
Johanna B. Salsman
Keyword(s):  
Dielectric Properties ◽  
Microwave Heating ◽  
Research Effort ◽  
Coaxial Line ◽  
Dielectric Constants ◽  
Dielectric Constant And Loss ◽  
Electrical Conductivities ◽  
Natural Density ◽  
The Common ◽  
Method Of Measurement

ABSTRACTAs part of the research effort on investigating the effects of microwave energy absorption on the chemical and physical properties of minerals and ores, the Bureau of Mines, Tuscaloosa Research Center has developed a technique of measuring the dielectric constant and loss tangent of minerals at the common microwave heating frequencies. The objective was to establish a reliable data base to aid in predicting the effects of microwave heating on minerals.In this phase of microwave research, the Bureau measured the dielectric properties of powdered minerals with medium to high electrical conductivities (a ≥ 0.02 Mho/m) in the frequency range of 300 MHz to 3 GHz using an open-ended coaxial line probe connected to an HP 8753A network analyzer. Since the minerals were prepared as powders, techniques were used to relate the measured dielectric properties of the powdered minerals to the dielectric properties of the mineral at Its theoretical or natural density. Also, these measurements were performed as a function of temperature, from 25° to 325° C.The measured values of the dielectric constants and loss tangents using this method were accurate within ±5 percent. This report describes the method of measurement and discusses the results of the Bureau's investigations into dielectric properties of minerals.

scholarly journals Numerical Analysis and Measurement of Electric field Strength inside GTEM Cell at GSM Frequencies

2019 ◽  
Vol 69 (5) ◽  
pp. 423-426
Author(s):  
Naina Narang ◽  
Satya K. Dubey ◽  
V.N. Ojha
Keyword(s):  
Field Strength ◽  
Measurement Data ◽  
Evaluation Procedure ◽  
Expanded Uncertainty ◽  
Exposure Effect ◽  
Simulation Procedure ◽  
Complete Uncertainty ◽  
Tissue Equivalent ◽  
Transverse Electromagnetic ◽  
Gtem Cell

A miniaturised gigahertz transverse electromagnetic (GTEM) cell is designed and fabricated to generate uniform electric (E-) field, essential for studying the radio frequency exposure effect on tissue equivalent liquids at global system for mobile (GSM) communication frequencies (914 MHz and 2.10 GHz). The simulation procedure is discussed and its results are compared with measurement data. The E-field strength inside the GTEM cell is scanned using a microstrip based E-field probe and complete uncertainty evaluation procedure is discussed. Theoretically, simulated and measured E-field strength is reported with expanded uncertainty.

scholarly journals Gigantic Coaxial Line for Experimental Studies of the Interaction of Nanosecond Electromagnetic Pulses with an Ionized Gas Medium

2021 ◽  
Vol 12 (1) ◽  
pp. 59
Author(s):  
Mikhail Gushchin ◽  
Alexey Palitsin ◽  
Askold Strikovskiy ◽  
Ilya Zudin ◽  
Sergey Korobkov ◽  
...  
Keyword(s):  
Large Scale ◽  
Experimental Studies ◽  
Coaxial Line ◽  
Rf Discharge ◽  
Ionized Gas ◽  
Electromagnetic Pulses ◽  
Pulse Transmission ◽  
Nanosecond Electromagnetic Pulses ◽  
Tem Mode ◽  
Transverse Electromagnetic

A large-scale coaxial line filled with the plasma of RF discharge has been developed for laboratory modeling of the effects of the interaction of ultrashort electromagnetic pulses (EMPs) with the atmosphere and the ionosphere in the KROT facility. The oversized coaxial line ensures pulse transmission through an ionized medium in the TEM mode, which corresponds to the polarization of the transverse electromagnetic wave in free space, and in uniform isotropic plasma. The coaxial line has a length of 10 m and a diameter of 140 cm. The processes of propagation of the nanosecond and subnanosecond pulses in this line, in vacuum and with plasma, have been simulated numerically.

High-Temperature Dielectric Properties Measurements of Ceramics

1992 ◽  
Vol 269 ◽  
Author(s):  
Shane Bringhurst ◽  
Octavio M. Andrade ◽  
Magdy F. Iskander
Keyword(s):  
High Temperature ◽  
Dielectric Properties ◽  
Frequency Band ◽  
Perturbation Technique ◽  
Measurement Techniques ◽  
Coaxial Line ◽  
Experimental Results ◽  
Experimental Measurements ◽  
Insulating Materials ◽  
Made In

ABSTRACTThis paper dicusses experimental arrangements, describes measurement techniques and presents experimental results for hightemperature broadband dielectric properties measurements of ceramics. The cavity perturbation technique and the open-ended coaxial line method are used in these experimental measurements. The design and construction details of cavities and probes are described and representative results of measurements on zirconia and alumina samples (green and sintered) are presented. Results of measurements made on insulating materials are shown. In general measurements are made in the frequency band 1 to 10 GHz and temperatures up to 1000°C.

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