/sci/ - Science & Math » Thread #12485803

75KiB, 419x314, zenneck array 1998.jpg

View Same Google iqdb SauceNAO

Anonymous Sun 20 Dec 00:09:58 2020 No.12485803 View Reply Original Report

Quoted By: >>12485881

>The famous mythology of the sign error in Sommerfeld formulation is debunked.
>It is amazing that this misleading information about the sign error has continued for almost a hundred years with researchers stating that there is a sign error in the Sommerfeld formulation but nobody actually was able to show exactly where the sign error occurred.

Was the Sommerfeld sign "error" a conspiracy?

Anonymous

Anonymous Sun 20 Dec 2020 00:36:47 No.12485881 Report

Quoted By: >>12486141

>>12485803
Zenneck waves are excited at interfaces, like surface plasmons and have the potential to deliver electrical power to devices placed on a conducting surface. Here, we demonstrate, efficient and long range delivery of electrical power by exciting non-radiative waves over metal surfaces to multiple loads. Our modeling and simulation using Maxwell’s equation with proper boundary conditions shows Zenneck type behavior for the excited waves and are in excellent agreement with experimental results. In conclusion, we physically realize a radically different class of power transfer system, based on a wave, whose existence has been fiercely debated for over a century.

Anonymous

Anonymous Sun 20 Dec 2020 02:23:32 No.12486141 Report

Quoted By:

>>12485881
The answer lies in the historical evolution of electromagnetic wave theory originating with the work of physicist James Maxwell and his famous equations of 1864. The German physicist, Heinrich Hertz, generated a continuum of solutions to Maxwell’s equations to derive and experi-mentally prove (1886-88) the existence of Hertzian radiated waves [13]. These ground waves as they are commonly termed are employed by a multitude of radio (AM, FM, SW, microwave, cell phone, etc.) com-munication devices that we use today. From 1907-1909 two other Ger-man physicists, Jonathan Zenneck and Arnold Sommerfeld, theorized the existence of an alternative form of electromagnetic wave, a surface wave, and derived its mathematical expression as an exact solution to Maxwell’s Equations.

Anonymous

Anonymous Sun 20 Dec 2020 02:54:37 No.12486197 Report

Quoted By:

As explained by Barlow [76] and Barlow and Cullen [77], and further illustrated in [78,79], a surface wave is one that propagates without radiating energy along an interface between two different media. If both media have finite losses, the energy directed along the interface will be required to supply the losses in the media. This does not invalidate the description of the surface wave if radiation is construed to mean that energy is absorbed from the wave independent of the media supporting it. The surface wave phenomenon arises primarily from its unique non-radiating characteristic which enables high frequency energy to be transferred intact from one point to another, except in so far as demands are made upon that energy to compensate for the losses in the two media.

Anonymous

Anonymous Sun 20 Dec 2020 02:55:54 No.12486201 Report

Quoted By:

It is a wave that is a solution of Maxwell’s equations and decays exponentially both in the transverse plane and along the direction of propagation. It has a phase velocity faster than the speed of light and the propagation constants of this wave are generally not highly dependent on frequency. In addition, a cylindrical Zenneck surface wave decays as 1/R. According to Schelkunoff this is strictly not a true surface wave.

Anonymous

Anonymous Sun 20 Dec 2020 04:15:42 No.12486385 Report

Quoted By:

The two quotes above, separated by almost 70 years, draw attention to “the great 20th century radio propagation controversy”, and illustrate a striking flaw that many of us had believed and taught throughout our professional careers! While the confusion was resolved analytically by Professor R.E. Collin,2 a seminal experimenthad justified K. Norton’s flawed analysis.3 The experiment was conducted in 1936 by Dr. C.R. Burrows4,5.6,7,8 of Bell Labs, and is, itself, famous as “the crucial radiowave experiment”.9,10,11 It has demonstrated some surprises of its own. Details of this intriguing history are documented elsewhere.12,13In 1907 Jonathan Zenneck took radiowave propagation into the 20th century by providing the first exact solution of Maxwell’s equations in the presence of a lossy interface.14,15While Zenneck’s field solution is exact, no source was specified and for many years it was considered to be spurious.16,17,18,19However, in 1979 Hill and Wait20,21 analytically found an aperture distribution that excites a pure Zenneck surface wave with no radiation field. It excites the discrete mode of the Green function that launches a Zenneck wave (a transmission line mode) without exciting the radiation field

Anonymous

Anonymous Sun 20 Dec 2020 04:19:47 No.12486400 Report

Quoted By: >>12489492

The Burrows/Norton opinion became a presupposition in academia, and guided 20th century scientific thought for almost 70 years. In 2004, Collin pointed out that there was no sign error, the Sommerfeld solution was correct,and even his integral approximations are fine ... they just restrict application of hisexpressions to regions far out (at large numerical distances). And, in this region the solutions of Weyl (whose integration does not capture the discrete pole) and Sommerfeld are identical.

n spite of the fact that Burrows’ Seneca Lake experiment did not satisfy the large numerical distance restriction on field strength calculations, it was unjustifiably used to substantiate the Norton-Niessen- Burrows assertion of a “Sommerfeld sign error”.

The tragedy is that the opportunity for practical terrestrial surface wave excitation and the possibilities for Zenneck wave wireless power distribution were missed altogether in the 20th century.

Anonymous

Anonymous Sun 20 Dec 2020 08:00:08 No.12486846 Report

Quoted By:

Very cool.

Anonymous

Anonymous Sun 20 Dec 2020 19:35:39 No.12488730 Report

Quoted By:

The corporate-military-industrial complex has caught on: https://www.youtube.com/watch?v=wFiW2lqdnlM

Anonymous

Anonymous Sun 20 Dec 2020 22:27:38 No.12489492 Report

Quoted By: >>12489673

>>12486400
Why are people so hung up on wireless transmission? Copper wire bad?

Anonymous

Anonymous Sun 20 Dec 2020 23:26:04 No.12489673 Report

Quoted By:

>>12489492
Probably the Tesla meme. But if it ackshully works it would enable better load management, generation at the point of extraction, and an end to squirrels frying themselves in substations.

Capcode	All Only User Posts Only Moderator Posts Only Admin Posts Only Developer Posts
Show Posts	All Only With Images Only Without Images
Deleted Posts	All Only Deleted Posts Only Non-Deleted Posts
Ghost Posts	All Only Ghost Posts Only Non-Ghost Posts
Post Type	All Only Sticky Threads Only Opening Posts Only Reply Posts
Results	All Grouped By Threads
Order	Latest Posts First Oldest Posts First

Your latest searches