scholarly journals Characterisation of dielectric 3D-printingmaterials at microwave frequencies

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 26
Author(s):  
Andrea Alimenti ◽  
Kostiantyn Torokhtii ◽  
Nicola Pompeo ◽  
Emanuele Piuzzi ◽  
Enrico Silva
Keyword(s):  
Quality Factor ◽  
Loss Tangent ◽  
Complex Permittivity ◽  
High Frequency ◽  
Measurement Method ◽  
Air Gap ◽  
3D Printer ◽  
Reliable Determination ◽  
Microwave Frequencies

<p class="Abstract">3D-printer materials are becoming increasingly appealing, especially for high frequency applications. As such, the electromagnetic characterisation of these materials is an important step in evaluating their applicability for new technological devices. We present a measurement method for complex permittivity evaluation based on a dielectric loaded resonator (DR). Comparing the quality factor <em>Q</em> of the DR with a disk-shaped sample placed on a DR base, with <em>Q</em> obtained when the sample is substituted with an air gap, allows a reliable determination of the loss tangent.</p>

scholarly journals Calculation improvement of no-load stray losses in induction motors with experimental validation

2015 ◽  
Vol 12 (3) ◽  
pp. 303-320
Author(s):  
Miloje Kostic
Keyword(s):  
High Frequency ◽  
Experimental Validation ◽  
Air Gap ◽  
New Classification ◽  
Iron Losses ◽  
Surface Iron ◽  
Space Harmonics ◽  
Rotor Cage

On the basis of the known fact that all air gap main flux density variations are enclosed by permeance slot harmonics, only one component of stray losses in rotor (stator) iron is considered in the new classification, instead of 2 components: rotor (stator) pulsation iron losses, and rotor (stator) surface iron losses. No-load rotor cage (high-frequency) stray losses are usually calculated. No-load stray losses are caused by the existence of space harmonics: the air-gap slot permeance harmonics and the harmonics produced by no-load MMF harmonics. The second result is the proof that the corresponding components of stray losses can be calculated separately for the mentioned kind of harmonics. Determination of the depth of flux penetration and calculations of high frequency iron losses are improved. On the basis of experimental validation, it is proved that the new classification of no-load stray losses and the proposed method for the calculation of the total value is sufficiently accurate.

Dielectric Measurement Of Multi-Layered Medium Using An Open-Ended Waveguide

1996 ◽  
Vol 430 ◽  
Author(s):  
O. Tantot ◽  
M. Chatard-Moulin ◽  
P. Guillon
Keyword(s):  
Reflection Coefficient ◽  
Complex Permittivity ◽  
Layered Medium ◽  
Circular Waveguide ◽  
Air Gap ◽  
Dielectric Measurement ◽  
Microwave Measurement ◽  
Measurement Devices

AbstractThe use of a circular waveguide radiating into a multi-layered media allows the characterization of heterogeneous and fluid subtances. Many microwave measurement devices, based on reflection coefficient measurements, are subjected to air gap problems that introduce some inaccuracy in the determination of the unknown complex permittivity of the materials. Our purpose is to try and take the air gap into account in these measurements.

A METHOD FOR THE DETERMINATION OF THE INDEX OF REFRACTION OF THIN TRANSPARENT FILMS

1948 ◽  
Vol 26a (4) ◽  
pp. 230-235 ◽  
Author(s):  
R. W. Stewart
Keyword(s):  
Thin Films ◽  
High Frequency ◽  
Air Gap ◽  
Index Of Refraction ◽  
Transparent Films ◽  
High Frequency Discharge ◽  
Discharge Tubes ◽  
Set Up ◽  
Fringe System

The index of refraction of thin films deposited on an optical flat is obtained by comparison of the fringe system set up in the film with that in the air gap between the film and another optical flat. The use of the method is illustrated by application to films produced in high frequency discharge tubes. Films produced in Pyrex glass and quartz tubes are shown to be silica in the form of cristobalite. Films produced in polystyrene tubes prove to have an index of refraction that is very low and is a function of the thickness.

scholarly journals 5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Nor Azimah Mohd Shukor ◽  
Norhudah Seman
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Quality Factor ◽  
Loss Tangent ◽  
High Frequency ◽  
Q Factor ◽  
Bandwidth Enhancement ◽  
Branch Line ◽  
Fifth Generation ◽  
Quality Factor Q

Abstract This study focuses on the effect of different dielectric properties in the design of 3-dB planar branch line coupler (BLC) using RT5880, RO4350, TMM4 and RT6010, particularly at high frequency of 26 GHz, the fifth generation (5G) operating frequency. The analysis conducted in this study is based on the dielectric constant, loss tangent and quality factor (Q-factor) associated with the dielectric properties of the substrate materials. Accordingly, the substrate that displayed the best performance for high frequency application had the lowest dielectric constant, lowest loss tangent and highest Q-factor (i.e., RT5880), and it was chosen to enhance our proposed 3-dB BLC. This enhanced 3-dB BLC was designed with the inclusion of microstrip-slot stub impedance at each port for bandwidth enhancement, and the proposed prototype had dimensions of 29.9 mm × 19.9 mm. The design and analysis of the proposed 3-dB BLC were accomplished by employing CST Microwave Studio. The performance of scattering parameters and the phase difference of the proposed BLC were then assessed and verified through laboratory measurement.

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