An Investigation into a Method of Detecting the Fault Induced High Frequency Voltage Signals of EHV Transmission lines for Protection Applications

1991 ◽  
Vol 11 (1) ◽  
pp. 43
Author(s):  
P. Agrawal
Keyword(s):  
Transmission Lines ◽  
High Frequency

High-frequency transmission lines

1994 ◽  
pp. 173-211
Author(s):  
J. Dunlop ◽  
D. G. Smith
Keyword(s):  
Transmission Lines ◽  
High Frequency

Electrical Characterization of Low-Profile Copper Foil for Reduced Surface Roughness Loss

2016 ◽  
Vol 2016 (1) ◽  
pp. 000358-000363 ◽  
Author(s):  
Qianfei Su ◽  
A. Ege Engin ◽  
Jerry Aguirre
Keyword(s):  
Surface Roughness ◽  
Cross Sections ◽  
Transmission Lines ◽  
High Frequency ◽  
Printed Circuit Board ◽  
Electrical Characterization ◽  
Cavity Resonator ◽  
Circuit Board ◽  
Low Profile ◽  
Measure Surface Roughness

Abstract Signal attenuation in transmission lines is a major issue for reliable transmission in high frequency range. Knowledge of the electrical parameters of printed circuit board (PCB), including dielectric constant and loss tangent, is critical. Moreover, surface roughness has a great effect on loss in high frequency. This paper demonstrates an effective simulation fitting method for electrical material characterization. Cavity resonator is chosen as the circuit for characterization. A methodology is presented to measure surface roughness from cross sections, and compared with values extracted from resonator measurements. Several materials and copper foils treatments, including low-profile, are analyzed in this paper.

Patterned Macrovoids for Dielectric Constant Control of High Frequency Circuit Substrates

1986 ◽  
Vol 72 ◽  
Author(s):  
M. Kahn ◽  
B. Kriese
Keyword(s):  
Dielectric Constant ◽  
Transmission Lines ◽  
High Frequency ◽  
Thermal Conductance ◽  
Propagation Delay ◽  
Constant Control ◽  
Microstrip Transmission Lines

AbstractFugitive ink and tape technology permit the inclusion of flat voids at predetermined locations in ceramic microcircuit substrates. Calculations show that critical stray capacitances can be reduced by as much as 65% and the propagation delay of microstrip transmission lines by 30% and more. The selectivity of the void location permits the retention of the full thermal conductance of the substrate under heat dissipating elements.

High frequency, periodic disturbances in dissipative systems - I. Small amplitude, finite rate theory

1970 ◽  
Vol 314 (1518) ◽  
pp. 387-415 ◽  
Keyword(s):  
Transmission Lines ◽  
High Frequency ◽  
Small Amplitude ◽  
Linear Models ◽  
Viscoelastic Model ◽  
Finite Amplitude ◽  
Dissipative Systems ◽  
Rate Theory ◽  
Finite Rate ◽  
Periodic Disturbances

A theory is developed describing finite amplitude, high frequency, periodic disturbances in dissipative systems. Although, for definiteness, the transmitting medium is taken to be a viscoelastic string, the results are applicable to nonlinear transmission lines and nonlinear dielectrics, as well as relaxing and reacting gas mixtures. Part I of the paper describes small amplitude but finite rate processes: part II will describe disturbances of unrestricted amplitude. It is shown that by interpreting high frequency waves as modulated simple waves with slowly changing Riemann invariants, the parameter expansion techniques of geometrical optics can be modified to include finite amplitude waves. The roles of the linear models of viscoelasticity and elasticity as well as that of nonlinear elasticity as approximations to the nonlinear viscoelastic model are elucidated.

Inkjet printed flexible transmission lines for high frequency applications up to 67 GHz

2014 ◽  
Author(s):  
Mohamed Moez Belhaj ◽  
Wei Wei ◽  
Emiliano Pallecchi ◽  
Colin Mismer ◽  
Isabel Roch-jeune ◽  
...  
Keyword(s):  
Transmission Lines ◽  
High Frequency

scholarly journals Parametric Fault Diagnosis of Very High-Frequency Circuits Containing Distributed Parameter Transmission Lines

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 550
Author(s):  
Michał Tadeusiewicz ◽  
Stanisław Hałgas
Keyword(s):  
Fault Diagnosis ◽  
Transmission Lines ◽  
High Frequency ◽  
Diagnostic Method ◽  
Distributed Parameter ◽  
Very High Frequency ◽  
Parametric Fault ◽  
The One ◽  
Very High ◽  
Parameter Transmission

Parametric fault diagnosis of analog very high-frequency circuits consisting of a distributed parameter transmission line (DPTL) terminated at both ends by lumped one-ports is considered in this paper. The one-ports may include linear passive and active components. The DPTL is a uniform two-conductor line immersed in a homogenous medium, specified by the per-unit-length (p-u-l) parameters. The proposed method encompasses all aspects of parametric fault diagnosis: detection of the faulty area, location of the fault inside this area, and estimation of its value. It is assumed that only one fault can occur in the circuit. The diagnostic method is based on a measurement test arranged in the AC state. Different approaches are proposed depending on whether the faulty is DPTL or one of the one-ports. An iterative method is modified to solve various systems of nonlinear equations that arise in the course of the diagnostic process. The diagnostic method can be extended to a broader class of circuits containing several transmission lines. Three numerical examples reveal that the proposed diagnostic method is fast and gives quite accurate findings.

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