MUTUAL ELECTROMAGNETIC COUPLING OF LOOPS OVER A HOMOGENEOUS GROUND—AN ADDITIONAL NOTE

Geophysics ◽  
1956 ◽  
Vol 21 (2) ◽  
pp. 479-484 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Electromagnetic Coupling ◽  
Mutual Impedance ◽  
Additional Note ◽  
Homogeneous Ground

Further computations are presented for the mutual impedance between small wire loops over a semi‐infinite conductor. The cases considered are where the axes of the loops are parallel to the interface.

MUTUAL ELECTROMAGNETIC COUPLING OF LOOPS OVER A HOMOGENEOUS GROUND

Geophysics ◽  
1955 ◽  
Vol 20 (3) ◽  
pp. 630-637 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Electromagnetic Coupling ◽  
Mutual Impedance ◽  
Geophysical Exploration ◽  
Electromagnetic Methods ◽  
Homogeneous Ground

Computations are presented for the mutual impedance between small wire loops situated on or over a semi‐infinite conductor. The results have application to electromagnetic methods of geophysical exploration.

HIGH‐FREQUENCY ELECTROMAGNETIC COUPLING BETWEEN SMALL COPLANAR LOOPS OVER AN INHOMOGENEOUS GROUND

Geophysics ◽  
1972 ◽  
Vol 37 (6) ◽  
pp. 997-1004 ◽  
Author(s):  
James A. Fuller ◽  
James R. Wait
Keyword(s):  
Half Space ◽  
High Frequency ◽  
Electromagnetic Coupling ◽  
Current Source ◽  
Vertical Axis ◽  
Loop Current ◽  
Mutual Impedance ◽  
Multiplicative Factor ◽  
The Earth ◽  
Horizontal Electric Dipole

An integral formulation is given for the fields of a loop current source which is located over a horizontally stratified half‐space and has a vertical axis. The electrical properties of the half‐space vary exponentially with the depth into the earth. An asymptotic solution is developed for the case of source and observer on the interface but separated by a large numerical distance. The approximate solution is then used to determine the mutual impedance between two small loops and between the loop and a horizontal electric dipole, when the antennas are on the interface. It is found that the effect of stratification on the mutual impedance is represented approximately by a single multiplicative factor.

scholarly journals Reciprocity and mutual impedance formulas within lossy cavities

2005 ◽  
Vol 3 ◽  
pp. 91-97
Author(s):  
F. Gronwald ◽  
E. Blume
Keyword(s):  
Method Of Moments ◽  
Electromagnetic Interference ◽  
Electromagnetic Coupling ◽  
Rectangular Cavity ◽  
Dipole Antennas ◽  
Mutual Impedance ◽  
Antenna Theory

Abstract. We discuss the validity of reciprocity and mutual impedance formulas within lossy cavities. Mutual impedance formulas are well-known from antenna theory and useful to describe the electromagnetic coupling between electromagnetic interference sources and victims. As an example the mutual impedance between two dipole antennas within a lossy rectangular cavity is calculated from a system of coupled Hallén's equations that efficiently is solved by the method of moments.

Corrections to Millett’s table of electromagnetic coupling phase angles

Geophysics ◽  
1984 ◽  
Vol 49 (9) ◽  
pp. 1554-1555 ◽  
Author(s):  
R. J. Brown
Keyword(s):  
Half Space ◽  
Random Error ◽  
Electromagnetic Coupling ◽  
Inductive Coupling ◽  
Coupling Phase ◽  
Mutual Impedance ◽  
Phase Angles

Millett (1967) published tables of values of the mutual impedance due to inductive coupling between two collinear dipoles on a uniform, nonpolarizable half‐space. In the course of a recent study (Brown, 1984) I have noticed significant errors, of two different kinds, in the phase angles (ϕ) given by Millett (1967). One kind of error is evidently typographical in nature and occurs only twice, in the M = 3 table, for θ = .01 and .02. The tabled values apparently had their decimal points shifted one place. The second and more serious kind of error is an apparently random error within the range ±0.003 degrees. This is not significant for larger |ϕ|, say |ϕ| > 1 degree, but the values of |ϕ| in Millett’s tables go down to 0.006 degrees (down to 0.0045 degrees after correction) where such errors are clearly significant, particlarly if one is working with logarithmic quantities as is common.

scholarly journals Sunflower-Like Nanostructure with Built-In Hotspots for Alpha-Fetoprotein Detection

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1197
Author(s):  
Xiaoyu Zhao ◽  
Aonan Zhu ◽  
Yaxin Wang ◽  
Yongjun Zhang ◽  
Xiaolong Zhang
Keyword(s):  
Rapid Detection ◽  
Clinical Medicine ◽  
Electromagnetic Coupling ◽  
Low Cost ◽  
Surface Enhanced Raman Spectroscopy ◽  
Alpha Fetoprotein ◽  
Low Concentrations ◽  
Surface Enhanced Raman ◽  
Active Substrate ◽  
Array Structures

In the present study, a sunflower-like nanostructure array composed of a series of synaptic nanoparticles and nanospheres was manufactured through an efficient and low-cost colloidal lithography technique. The primary electromagnetic field contribution generated by the synaptic nanoparticles of the surface array structures was also determined by a finite-difference time-domain software to simulate the hotspots. This structure exhibited high repeatability and excellent sensitivity; hence, it was used as a surface-enhanced Raman spectroscopy (SERS) active substrate to achieve a rapid detection of ultra-low concentrations of Alpha-fetoprotein (AFP). This study demonstrates the design of a plasmonic structure with strong electromagnetic coupling, which can be used for the rapid detection of AFP concentration in clinical medicine.

scholarly journals Freestanding bilayer plasmonic waveguide coupling mechanism for ultranarrow electromagnetic-induced transparency band generation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Li Yu ◽  
Yuzhang Liang ◽  
Shuwen Chu ◽  
Huixuan Gao ◽  
Qiao Wang ◽  
...  
Keyword(s):  
Electromagnetic Coupling ◽  
Transmission Band ◽  
Waveguide Structure ◽  
Plasmonic Waveguide ◽  
Plasmonic Nanostructures ◽  
Destructive Interference ◽  
Group Index ◽  
Coupling Mechanism ◽  
Induced Transparency ◽  
Electromagnetic Induced Transparency

AbstractStrong electromagnetic coupling among plasmonic nanostructures paves a new route toward efficient manipulation of photons. Particularly, plasmon-waveguide systems exhibit remarkable optical properties by simply tailoring the interaction among elementary elements. In this paper, we propose and demonstrate a freestanding bilayer plasmonic-waveguide structure exhibiting an extremely narrow transmission peak with efficiency up to 92%, the linewidth of only 0.14 nm and an excellent out of band rejection. The unexpected optical behavior considering metal loss is consistent with that of electromagnetic induced transparency, arising from the destructive interference of super-radiative nanowire dipolar mode and transversal magnetic waveguide mode. Furthermore, for slow light application, the designed plasmonic-waveguide structure has a high group index of approximately 1.2 × 105 at the maximum of the transmission band. In sensing application, its lowest sensing figure of merit is achieved up to 8500 due to the ultra-narrow linewidth of the transmission band. This work provides a valuable photonics design for developing high performance nano-photonic devices.

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