David,
I don't see any connection to the shield of the coax used in the
driven element or the reflector (see drawing, "Center Conductor only
is attached to feedline on both ends!"). It looks to me as though coax
is being used as wire with a very thick dielectric coating. Since EM
waves travel more slowly in any (known) medium other than free space,
placing the wire in the dielectric causes it to look electrically
longer.
As far as I know, all dielectric coatings also have more loss than
free space, so that may need to be accounted for in any analysis.
Brian K1LI
On 8/3/08, David J. Sourdis <hk1kxa@hotmail.com> wrote:
> http://www.hamuniverse.com/17mcoaxmox.html
>
> A quarter wave coax, shorted at the end shows an infinite impedance.
> Is it possible what is described in the link?
>
> David
> HK1KXA
> EC5KXA
>
>
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