scholarly journals Frequency response analysis of dielectric materials in a parallel-plate transmission line

2021 ◽  
Vol 22 (2) ◽  
pp. 893
Author(s):  
Aaron Don Munsayac Africa ◽  
Gregory James Pe ◽  
Robert Ianny Roy Quijano
Keyword(s):  
Transmission Line ◽  
Frequency Response ◽  
Transmission Lines ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Signal Transmission ◽  
Sheet Material ◽  
Dielectric Materials ◽  
Response Analysis ◽  
Parallel Plates

A transmission line allows different frequencies to conduct alternating current (AC). They are a peculiar type of wire that allows signal transmission while making it resistant to external noises. A parallel-plate transmission line is a type of transmission line designed with two parallel plates with a dielectric sheet material in the center, as the name implies. The parallel-plate transmission lines are usually used for a miniature setup in which the line prevents the signal from losing power. However, the line's frequency response is a varying setup in which a change in a parameter can fully change the frequency response of the line, and in turn trigger inefficiency. With this, different factors such as the conductor, the size, and the dielectric material of the parallel-plate transmission line can affect its frequency response. Specifically, the analysis of the transmission would test the various frequency responses when the dielectric sheet content is varied. The researchers will carry out experiments on air, Teflon, plexiglass, and E type glass dielectrics.

scholarly journals Influence of Parallel Plate Stack Spacing on the Temperature Difference of Thermoacoustic Refrigerator by using Helium as a Working Medium

2019 ◽  
Vol 8 (4) ◽  
pp. 2704-2712
Keyword(s):  
Heat Exchanger ◽  
Temperature Difference ◽  
Parallel Plate ◽  
Sheet Material ◽  
Maximum Temperature ◽  
Working Fluid ◽  
Operating Pressure ◽  
Parallel Plates ◽  
Refrigeration System ◽  
Thermoacoustic Refrigerator

The refrigerants are usually provided in the conventional refrigeration system despite the fact that, they produce CFCs and HCFCs, which are hazardous to the environment. However, these disadvantages can be overcome using air or inert gas in the thermoacoustic refrigeration system. The present research involves the effect of spacing of parallel plate stack on the performance of thermoacoustic refrigerator (TAR) in terms of temperature difference (∆T). The entire resonator system as well as other structural parts of the refrigerator are fabricated by using PVC to reduce conduction heat loss. Three parallel plate stacks have been used to study the performance of TAR considering different porosity ratios by varying the gap between the parallel plates (0.28 mm, 0.33 mm and 0.38 mm). The parallel plate stacks are fabricated by using aluminium and mylar sheet material and the working fluid used for the experimental study is helium. The experiments have been carried out with different drive ratios ranging from 0.6% to 1.6% with operating frequencies of 200 – 600 Hz. Also the mean operating pressure used for the experiment is 2 to 10 bar and cooling load of 2 to 10W are considered. The ∆T between the hot heat exchanger and cold heat exchanger is recorded using RTDs and Bruel and Kjaer data acquisition system. Experimental results shows that the lowest temperature measured at cold heat exchanger is -2.1 oC by maintaining the hot heat exchanger temperature at about 32 oC. The maximum temperature difference of 32.90 oC is achieved.

The Generalized Response of Servovalve-Controlled, Single-Rod, Linear Actuators and the Influence of Transmission Line Dynamics

1984 ◽  
Vol 106 (2) ◽  
pp. 157-162 ◽  
Author(s):  
J. Watton
Keyword(s):  
Transmission Line ◽  
Frequency Response ◽  
System Design ◽  
Dynamic Behavior ◽  
Transmission Lines ◽  
Fatigue Testing ◽  
Open Loop ◽  
Linear Actuators ◽  
Probable Type

The open-loop response of servovalve-controlled single-rod linear actuators in investigated for both the extending and retracting cases. A linearized frequency response technique is used to establish the probable type of dynamic behavior. Nondimensional results are presented as an aid to system design, and a boundary is established such that a simplified approximation may be used. A particular class of system is then examined where interconnecting transmission lines would be important, and the techniques previously used are modified accordingly. The techniques are verified with a precision actuator developed for fatigue testing of vehicle and airframe systems.

scholarly journals Understanding Dielectrics: Impact of External Salt Water Bath

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2033
Author(s):  
Jonathan Phillips ◽  
Alexander Roman
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Salt Water ◽  
Low Frequency ◽  
Ambient Air ◽  
Dielectric Materials ◽  
Standard Theory ◽  
Parallel Plate Capacitor

As predicted by the theory of super dielectric materials, simple tests demonstrate that dielectric material on the outside of a parallel plate capacitor dramatically increases capacitance, energy density, and power density. Simple parallel plate capacitors with only ambient air between the plates behaved as per standard theory. Once the same capacitor was partially submerged in deionized water (DI), or DI with low dissolved NaCl concentrations, still with only ambient air between the electrodes, the capacitance, energy density, and power density, at low frequency, increased by more than seven orders of magnitude. Notably, conventional theory precludes the possibility that material outside the volume between the plates will in any fashion impact capacitive behavior.

Fault Location of Transmission Line Based on Discrete Wavelet Transforms

2011 ◽  
Vol 121-126 ◽  
pp. 1269-1273
Author(s):  
Wen Xiu Tang ◽  
Mo Zhang ◽  
Ying Liu ◽  
Xu Fei Lang ◽  
Liang Kuan Zhu
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Wavelet Transforms ◽  
Fault Location ◽  
Short Circuit ◽  
Signal Transmission ◽  
Transient Signal ◽  
Discrete Wavelet ◽  
Novel Method ◽  
Non Stationary Signal

In this paper, a novel method is investigated to detect short-circuit fault signal transmission lines in strong noise environment based on discrete wavelet transform theory. Simulation results show that the method can accurately determine the fault position, can effectively analyze the non-stationary signal and be suitable for transmission line fault occurred after transient signal detection. Furthermore, it can effectively eliminate noise effects of fault signal so as to realize the transmission lines of accurate fault.

scholarly journals Simulation of space charge transport in solid dielectric materials using transmission lines modeling method

2019 ◽  
Vol 09 (06) ◽  
pp. 1950051
Author(s):  
Amin Shamsi ◽  
Alireza Ganjovi ◽  
Amirabbas Shayegani Akmal
Keyword(s):  
Transmission Line ◽  
Charge Density ◽  
Space Charge ◽  
Current Density ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
Solid Dielectric ◽  
Recombination Rates ◽  
Net Charge ◽  
Charged Species

In this paper, a lumped RC circuit model, which is based on the Transmission Line Modeling (TLM) method, is used to describe the space charge production and displacement mechanisms in three different solid dielectric materials (LDPE, PTFE and FR4). Each dielectric material is considered as a transmission line with the capacitive and resistance elements. The obtained circuit equations are solved along with the continuity equations for the various charged species in the bulk of solid dielectric material. The electric potential and field, density of different charged species and their recombination rates, resistive and capacitive properties of the solid dielectric material are calculated. In addition, the effects of the variations in the applied voltage, dielectric permittivity and temperature on these physical parameters are examined. Besides, compared with LDPE and PTFE, the net charge density increment rate in FR4 is much higher. Moreover, the influences of temperature on the net charge density in LDPE are not significant. Furthermore, at the higher applied voltages, the current density is increased. Interestingly, the effects of temperature variations on the recombination rates, net charge and current density in LDPE are much lower. Hence, the suitability of LDPE as solid dielectric material is proved.

RADIATION AND RECEPTION PROPERTIES OF A WIDE SLOT IN A PARALLEL-PLATE TRANSMISSION LINE: II

1959 ◽  
Vol 37 (2) ◽  
pp. 160-169
Author(s):  
R. F. Millar
Keyword(s):  
Plane Wave ◽  
Transmission Line ◽  
Parallel Plate ◽  
Slot Width ◽  
Reflection And Transmission Coefficients ◽  
Parallel Plates ◽  
Polar Diagram ◽  
Reflection And Transmission ◽  
Transmission Coefficients

The study initiated in Part I is continued, with consideration being given to the case in which only a TEM wave is propagated in the parallel-plate region. The reflection and transmission coefficients, and the polar diagram of the radiated field are determined.The amplitude and phase of the propagated wave excited in the line by an incident cylindrical or plane wave are determined by reciprocity arguments.Curves are presented to illustrate the dependence of the field on the slot width and the distance between the parallel plates, for the two field types considered here and in the previous paper.

Theoretical and experimental basis for the super dielectric model of dielectric materials

2020 ◽  
Vol 33 (3) ◽  
pp. 306-318
Author(s):  
Jonathan Phillips
Keyword(s):  
Field Theory ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
Theory Model ◽  
Stored Energy ◽  
Basic Field ◽  
Extra Charge ◽  
The Standard Model ◽  
Material Theory

Two theories of the fields generated by charges on parallel plate capacitors, the standard model (SM) found in virtually all text books and the recently proposed super dielectric material-theory (SDM-Theory), are described, and contrasted, in terms of theory and experimentally tested predictions. Only the SDM-Theory model is found to be consistent with thermodynamics, basic field theory, and experimental results. According to the SM, dielectrics in the volume between the electrodes of a parallel plate capacitor store the energy in a capacitor in the form of greatly, relative to the no dielectric case, increased electric field strength. This model is shown to be inconsistent with path independent changes in state property (e.g., voltage), and predicts, incorrectly, that dielectric material outside the volume between the electrodes will have no effect on any measurable properties such as capacitance and energy density. In contrast, according to SDM-Theory, a theory shown to be consistent with path independent changes in state properties, as well as “conservative field theory,” the increased stored energy in the presence of dielectrics is not associated with energy in fields, but rather it is due to the “extra” charges stored on the electrodes. The extra charge is required to create a given net field in the presence of a dielectric. Indeed, according to SDM-Theory, the effect of dielectric material, because its polarization is opposite to the electrodes, reduces the net field at all points in space, including within the volume of the dielectric. This is the absolute opposite of the “action” of a dielectric predicated by the SM. In the SDM-Theory, at a given capacitor voltage, virtually identical net fields exist with and without a dielectric, but the capacitance (amount of stored charge) and stored energy, a linear function of the amount of stored charge, of the latter configuration can be many orders of magnitude greater. Moreover, SDM-Theory predicts, consistent with recent observations, that dielectric material external to the volume between electrodes should be nearly as effective at increasing capacitance, etc., as the same dielectric material between the electrodes.

Frequency Response of Blocked Annular Fluid Transmission Lines

1981 ◽  
Vol 103 (4) ◽  
pp. 366-369
Author(s):  
M. E. Franke ◽  
G. R. Farney ◽  
E. F. Moore
Keyword(s):  
Transmission Line ◽  
Frequency Response ◽  
Transmission Lines ◽  
Transmission Line Theory ◽  
Line Theory ◽  
Theory And Experiment

Frequency response measurements on blocked annular pneumatic transmission lines with five different radius ratios have been obtained and compared with annular transmission line theory. The agreement between theory and experiment was good.

scholarly journals Multipactor in parallel-plate transmission line partially filled with dielectric material

2018 ◽  
Vol 67 (15) ◽  
pp. 157901
Author(s):  
Zhai Yong-Gui ◽  
Wang Rui ◽  
Wang Hong-Guang ◽  
Lin Shu ◽  
Chen Kun ◽  
...  
Keyword(s):  
Transmission Line ◽  
Parallel Plate ◽  
Dielectric Material
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