Using electromagnetic time reversal to locate faults in transmission lines: Definition and application of the “Mirrored Minimum Energy” property

2017 ◽  
Author(s):  
Zhaoyang Wang ◽  
Asia Codino ◽  
Reza Razzaghi ◽  
Mario Paolone ◽  
Farhad Rachidi
Keyword(s):  
Transmission Lines ◽  
Time Reversal ◽  
Minimum Energy ◽  
Energy Property

scholarly journals Antisymmetry: Fundamentals and Applications

2020 ◽  
Vol 50 (1) ◽  
pp. 255-281 ◽  
Author(s):  
Hari Padmanabhan ◽  
Jason M. Munro ◽  
Ismaila Dabo ◽  
Venkatraman Gopalan
Keyword(s):  
Time Reversal ◽  
Minimum Energy ◽  
Chemical Species ◽  
Physical World ◽  
State Theory ◽  
Magnetic Structures ◽  
Structures And Properties ◽  
Point Groups ◽  
Arbitrary Dimensions ◽  
Energy Pathways

Symmetry is fundamental to understanding our physical world. An antisymmetry operation switches between two different states of a trait, such as two time states, position states, charge states, spin states, or chemical species. This review covers the fundamental concepts of antisymmetry and focuses on four antisymmetries, namely, spatial inversion in point groups, time reversal, distortion reversal, and wedge reversion. The distinction between classical and quantum mechanical descriptions of time reversal is presented. Applications of these antisymmetries—in crystallography, diffraction, determining the form of property tensors, classifying distortion pathways in transition state theory, finding minimum energy pathways, diffusion, magnetic structures and properties, ferroelectric and multiferroic switching, classifying physical properties in arbitrary dimensions, and antisymmetry-protected topological phenomena—are described.

scholarly journals Perfect absorption in complex scattering systems with or without hidden symmetries

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Lei Chen ◽  
Tsampikos Kottos ◽  
Steven M. Anlage
Keyword(s):  
Transmission Lines ◽  
Time Reversal ◽  
Laser Cavity ◽  
Wireless Power ◽  
Perfect Absorption ◽  
Hidden Symmetries ◽  
Hidden Symmetry ◽  
Coherent Perfect Absorption ◽  
Wavefront Shaping ◽  
Coupled Transmission Lines

AbstractWavefront shaping (WFS) schemes for efficient energy deposition in weakly lossy targets is an ongoing challenge for many classical wave technologies relevant to next-generation telecommunications, long-range wireless power transfer, and electromagnetic warfare. In many circumstances these targets are embedded inside complicated enclosures which lack any type of (geometric or hidden) symmetry, such as complex networks, buildings, or vessels, where the hypersensitive nature of multiple interference paths challenges the viability of WFS protocols. We demonstrate the success of a general WFS scheme, based on coherent perfect absorption (CPA) electromagnetic protocols, by utilizing a network of coupled transmission lines with complex connectivity that enforces the absence of geometric symmetries. Our platform allows for control of the local losses inside the network and of the violation of time-reversal symmetry via a magnetic field; thus establishing CPA beyond its initial concept as the time-reversal of a laser cavity, while offering an opportunity for better insight into CPA formation via the implementation of semiclassical tools.

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