Author Topic: Microwave TL coax impedance  (Read 8671 times)

0 Members and 1 Guest are viewing this topic.

Offline nix85Topic starter

  • Regular Contributor
  • *
  • !
  • Posts: 78
  • Country: hr
Re: Microwave TL coax impedance
« Reply #50 on: March 13, 2020, 01:31:37 pm »
Lines of flux aren't a terribly great explanatory tool.  They lead to confusion with the spinning magnet-disk problem (doesn't matter if the magnet spins, it's radially symmetric -- but you might be tempted to think the lines are bonded to it like a brush), and the transformer just looks weird.

Consider the de-energized transformer.  Where are the flux lines?  There aren't any inside.  But there must be flux lines somewhere, if we imagine them to be some kind of conserved physical material.  The answer is: they are at infinity.  In infinite supply, unreachably far away, so their presence there can't possibly matter otherwise.  When the transformer is energized, lines of flux are brought in, from infinity, into the local loop -- thus cutting wires and inducing voltage, as the story goes.

Far better to just stick with enclosed area and field intensity...


That's all nice and sweet, flux exists "in infintiy" etc, but you did not address the issue. Good that you touched upon the Faraday's disc where induction happens altho there is no relative motion between magnet and copper disc.

So, from the father of "wire must cut flux" we have the negation of the same.

Let's hear Joseph Henry, discoverer of self-inductance and mutual inductance and what is less known but far more important, two kinds of induction, one weaker which cannot be screened except with iron and another that can be screened by any metal. He concludes suddent breaking of contact produces both kinds of induction and that this mysterious first type is akin to induction produced by motion.

This is from Scientific writings of Joseph Henry, Section 11, PDF file pages 178. - 185. >>

The book >>

Feynman on two kinds of induction

About these if you want to gain any deeper understanding in this life, and all these are but basics.

Etheric Rainmaking with Trevor James Constable

Another example...

We can see in this video   how flux prefers to loop on itself through the air, rather than go through the core surrounded by aluminum ring. Why would flux in the core care about a ring that is OUTSIDE of a core. This is the whole point.

In simple words, induction happens by etheric disturbance, magnetic field of the primary affecting the subtler energy present all around us which is then picked up at the secondary and transformed, that is, slowed down back into magnetic field.

Magnetic field is just an effect, ether is the true medium of transmission.

« Last Edit: March 13, 2020, 03:18:12 pm by nix85 »

Online ejeffrey

  • Super Contributor
  • ***
  • Posts: 3797
  • Country: us
Re: Microwave TL coax impedance
« Reply #51 on: March 13, 2020, 10:34:24 pm »
Transformer induction is described by maxwells equations.  The fact that you can't or won't understand the math is irrelevant.  Its fine (good!) to try and find better mental pictures and explanations of why or how it works, but if you are claiming that maxwells equations -- in particular - Faraday's law of induction do not work, you are just plain wrong.

Also, while maxwells equations were completed in the 19th centry, they were basically defective until the 20th centry as they cannot properly be understood without relativity -- in fact the failure of maxwells equations to maintain a nice form under newtonian coordinate transforms was one of the main motivations for the development of relativity.  If you try to reason about electrodynamics in a newtonian mechanics formalism you are going to get confusing or contradictory results.

Quoting Henry is also not particularly relevant.  It is enlightening to read the writings of the "old masters" to understand how they thought about the world and made their discoveries, but our collective understanding of their discoveries have progressed considerably since then.  Most 3 year physics undergrads understand electromagnetism better than faraday or maxwell or henry ever did.

Offline KaneTW

  • Frequent Contributor
  • **
  • Posts: 806
  • Country: de
Re: Microwave TL coax impedance
« Reply #52 on: March 14, 2020, 02:52:20 am »
Can we please not feed the troll?
The following users thanked this post: Andy Watson

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo