K7ITM wrote:
On Dec 2, 7:09 pm, John Smith wrote:
Why not:

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etc.

A "flattened" coil, first time I see one used is Vincents' DLM, anyone?

Regards,
JS

P.S. Excuse the bad ascii graphics ...

Not a very efficient "coil." Consider what the magnetic fields are
from each wire segment. A flat _spiral_ is sometimes used, e.g. by
etching it into a PCB, though they are generally not as good as
traditional helical or toroidal coils. A stub of transmission line
less than a quarter wave long and shorted at the far end looks
inductive, too, but at HF it's a pretty inefficient way to get
inductance. They're much more useful at UHF and above.

Interesting response. The "major efficiency" you are stating is?

1) Inductance per length of conductor?

2) Space required for inductor?

3) Losses?

4) Other?

Regards,
JS