On Sep 23, 10:21 pm, Clayton wrote:
....
Can any of you suggest a good book on coils,that includes theory,math
and all that good stuff?

Google "Grover Inductance Calculations" and you'll get loads of refs
and comments on Dr. Grover's book on the subject (as well as places to
buy it). Are you sure you really want to know THAT much about
them?? :-) If your library has the book or can get it, it's an
interesting one to have a look into. For coils (or for that matter
straight wires) at RF, you need to start considering things like skin
effect (where the current flows mainly at the surface of conductors)
and proximity effect (where the fields from a nearby wire affect where
current flows in the wire under consideration -- like how adjacent
turns of a coil affect one another).

A more reasonable place to start might be a text for a first college
course in electricity and magnetism. You'll learn enough about
inductance to have a very decent understanding of it, and if you
explore other topics there, you'll have the tools to understand a lot
more about RF circuits and fields in general.

Finally, nothing replaces actually doing things with coils (and other
parts), getting them to perform some function you want. I've done
quite a bit of work with coils over the years, and I'm still
learning. Last week, I spent some time working on a filter that uses
several coils of approximately 100 nanohenries each. I'm looking for
100dB and more out-of-band attenuation. I had to get very detailed in
my computer model to have it correspond reasonably well with measured
performance, including the "parasitic" effects of stray inductance and
capacitance--more so than I initially expected. In a lot of other
situations I deal with, those strays aren't nearly so important.
That's the sort of thing you'll probably learn better by "doing" than
by "reading."

Cheers,
Tom


Cheers,
Tom