"Richard Clark" wrote in message
news
So, in commemoration of that sort of criteria, what do you mean by
...don't take up a lot of space.

I'm liking panel-type antennas that are on the order of, oh, say, 0.2\lambda
by 0.2\lamba by perhaps .05\lambda or less. So electrically small, but not
super-electrically small. :-)

Joel Koltner wrote:
"Richard Clark" wrote in message
news
So, in commemoration of that sort of criteria, what do you mean by
...don't take up a lot of space.

I'm liking panel-type antennas that are on the order of, oh, say,
0.2\lambda by 0.2\lamba by perhaps .05\lambda or less. So electrically
small, but not super-electrically small. :-)


Considering a dipole is 0.5 lambda by 0.01 lambda, getting a factor of
2.5 smaller is easy. (that is, you want 40cm by 40cm or so)

A simple short dipole with capacity hats and inductive loading will get
you there quite nicely.

Imagine a "I" with the feedpoint at the middle, on a piece of FR-4 or
G-10 (epsilon about 2). make it, say, 30x30 cm. You could also make the
dipole diagonal across the square, and have the "capacity hats" be along
the edge.

You could fool with NEC for a bit and get pretty close.

Or, do what I'd do.. get yourself a piece of suitable insulating
substrate (a plastic cutting board or piece of acrylic window pane) and
some copper foil tape. Lay it down, measure it with an antenna analyzer
or similar, and start adjusting.

I've built more than one antenna like this using copper foil tape on
paper or plastic sheets.