Whereas some of us can grandly quote the differential form of
Maxwell's Equations with our "Del dot" and "Del cross"
notations, I wonder how many, if at all, of us can actually solve
what are those 3-dimensional differential equations in real situations?

Not many, I suspect.

And certainly not I in my current stage of electromagnetic revision!

Gareth's Downstairs Computer
wrote:

Whereas some of us can grandly quote the differential form of
Maxwell's Equations with our "Del dot" and "Del cross"
notations, I wonder how many, if at all, of us can actually solve
what are those 3-dimensional differential equations in real situations?

Not many, I suspect.

And certainly not I in my current stage of electromagnetic revision!

I really don't think anyone can solve them in a real situation, except
by using numerical methods on small bits of the real situation and
combining them. In which case any of us can probably do it using the
right software.

Writing the software was probably a bit of a challenge.

--

Roger Hayter

On 24/10/2018 15:38, Roger Hayter wrote:
Gareth's Downstairs Computer
wrote:

Whereas some of us can grandly quote the differential form of
Maxwell's Equations with our "Del dot" and "Del cross"
notations, I wonder how many, if at all, of us can actually solve
what are those 3-dimensional differential equations in real situations?

Not many, I suspect.

And certainly not I in my current stage of electromagnetic revision!

I really don't think anyone can solve them in a real situation, except
by using numerical methods on small bits of the real situation and
combining them. In which case any of us can probably do it using the
right software.

Writing the software was probably a bit of a challenge.



That's an interesting observation from a retired medical practitioner!

Is there something about your education that you're not telling us? :-)

Hopefully, I'm working towards an understanding of the innards of such
software

On 24/10/2018 16:35, Brian Morrison wrote:
On Wed, 24 Oct 2018 16:26:33 +0100
Gareth's Downstairs Computer wrote:

Hopefully, I'm working towards an understanding of the innards of such
software

Companies such as Ansoft and CST (now owned by Dassault) employ whole
buildings full of people with PhDs to do this sort of thing, it's
definitely a major undertaking and the end result is quite expensive to
buy a licence to use.


Where I studied this stuff originally just coming up to 50 years ago,
there was never enough time allowed in the courses to really understand
what was happening, you just had to recognise the formulae and where to
apply them in exam questions. I drifted away from electromagnetics in
the 3rd year, specialising in computer engineering, so never really got
much past Maxwell, but now, because of the amateur radio interest,
especially antennae, I'd now like to take on a deep understanding of
what's happening. Taken with my 44 year career as a real-time softy, I'm
confident that I shall succeed in my goal unless I lose interest in
yet another "vapour" pursuit, as some nonce puts it.

What's the officially recognised way to address a PhD recipient? ...

.... A burger and fries, please. :-)

In rec.radio.amateur.antenna Gareth's Downstairs Computer wrote:
Whereas some of us can grandly quote the differential form of
Maxwell's Equations with our "Del dot" and "Del cross"
notations, I wonder how many, if at all, of us can actually solve
what are those 3-dimensional differential equations in real situations?

Not many, I suspect.

About as many as accountants that balance the company books with a
goose quill pen and arithmetic.


--
Jim Pennino

Gareth's Downstairs Computer
wrote:
Whereas some of us can grandly quote the differential form of
Maxwell's Equations with our "Del dot" and "Del cross"
notations, I wonder how many, if at all, of us can actually solve
what are those 3-dimensional differential equations in real situations?

Not many, I suspect.

And certainly not I in my current stage of electromagnetic revision!


G is for gurgle.

--
STC / M0TEY /
http://twitter.com/ukradioamateur

On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote:

Where I studied this stuff originally just coming up to 50 years ago,
there was never enough time allowed in the courses to really understand
what was happening, you just had to recognise the formulae and where to
apply them in exam questions. I drifted away from electromagnetics in
the 3rd year, specialising in computer engineering, so never really got
much past Maxwell, but now, because of the amateur radio interest,
especially antennae, I'd now like to take on a deep understanding of
what's happening.

Hello. So you want a "deep" understanding of antenna theory? Pick up a
copy of the two volume "bible" set from McGraw-Hill that I used in a
grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker.
These texts will set you back a few bucks. But be warned: If you don't
understand that undergrad vector calculus stuff like "curl" and
"divergence" used in things such as Green's and Stokes' theorems, you'll
be lost in the forest. (Wishing amateur radio folks would stop using
the modifier "magnetic" when mentioning loop antennas). Sincerely,


--
J. B. Wood e-mail:

On 25/10/2018 11:42, J.B. Wood wrote:
On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote:

Where I studied this stuff originally just coming up to 50 years ago,
there was never enough time allowed in the courses to really
understand what was happening, you just had to recognise the formulae
and where to apply them in exam questions. I drifted away from
electromagnetics in the 3rd year, specialising in computer
engineering, so never really got
much past Maxwell, but now, because of the amateur radio interest,
especially antennae, I'd now like to take on a deep understanding of
what's happening.

Hello. So you want a "deep" understanding of antenna theory?Â* Pick up a
copy of the two volume "bible" set from McGraw-Hill that I used in a
grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker.
These texts will set you back a few bucks.Â* But be warned: If you don't
understand that undergrad vector calculus stuff like "curl" and
"divergence" used in things such as Green's and Stokes' theorems, you'll
be lost in the forest.Â* (Wishing amateur radio folks would stop using
the modifier "magnetic" when mentioning loop antennas).Â* Sincerely,



I have Ramo, Whinnery and Van Duzer, 2nd Ed; also Aharoni.

Gareth's Downstairs Computer
wrote:
On 25/10/2018 11:42, J.B. Wood wrote:
On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote:

Where I studied this stuff originally just coming up to 50 years ago,
there was never enough time allowed in the courses to really
understand what was happening, you just had to recognise the formulae
and where to apply them in exam questions. I drifted away from
electromagnetics in the 3rd year, specialising in computer
engineering, so never really got
much past Maxwell, but now, because of the amateur radio interest,
especially antennae, I'd now like to take on a deep understanding of
what's happening.

Hello. So you want a "deep" understanding of antenna theory?Â* Pick up a
copy of the two volume "bible" set from McGraw-Hill that I used in a
grad school course, "Antenna Theory" by R.E. Collin and F.J. Zucker.
These texts will set you back a few bucks.Â* But be warned: If you don't
understand that undergrad vector calculus stuff like "curl" and
"divergence" used in things such as Green's and Stokes' theorems, you'll
be lost in the forest.Â* (Wishing amateur radio folks would stop using
the modifier "magnetic" when mentioning loop antennas).Â* Sincerely,



I have Ramo, Whinnery and Van Duzer, 2nd Ed; also Aharoni.


G is for garden fence.

--
STC / M0TEY /
http://twitter.com/ukradioamateur

Bernie wrote:
On Thu, 25 Oct 2018 12:58:48 +0100
Gareth's Downstairs Computer
wrote:

On 25/10/2018 11:42, J.B. Wood wrote:
On 10/24/2018 11:44 AM, Gareth's Downstairs Computer wrote:

Where I studied this stuff originally just coming up to 50 years
ago, there was never enough time allowed in the courses to really
understand what was happening, you just had to recognise the
formulae and where to apply them in exam questions. I drifted away
from electromagnetics in the 3rd year, specialising in computer
engineering, so never really got
much past Maxwell, but now, because of the amateur radio interest,
especially antennae, I'd now like to take on a deep understanding
of what's happening.

Hello. So you want a "deep" understanding of antenna theory?Â* Pick
up a copy of the two volume "bible" set from McGraw-Hill that I
used in a grad school course, "Antenna Theory" by R.E. Collin and
F.J. Zucker. These texts will set you back a few bucks.Â* But be
warned: If you don't understand that undergrad vector calculus
stuff like "curl" and "divergence" used in things such as Green's
and Stokes' theorems, you'll be lost in the forest.Â* (Wishing
amateur radio folks would stop using the modifier "magnetic" when
mentioning loop antennas).Â* Sincerely,



I have Ramo, Whinnery and Van Duzer, 2nd Ed; also Aharoni.


A donkey carrying a load of holy books is still a donkey.
(Traditional Sufi saying.)

A Gareth with a £350 law book is still getting convicted.

--
STC / M0TEY /
http://twitter.com/ukradioamateur