On Oct 9, 7:31*pm, Art Unwin wrote:
I have put the mesh radiator on my page
Nothing more to add, you have it all.

Not really.

For examples, over a given r-f bandwidth:

- Radiation pattern throughout the free-space radiation sphere?
- Free-space gain with respect to an isotropic radiator (dBi) or a
matched, 1/2-wave dipole (dBd)?

Note that any particular r-f termination may have low feedpoint VSWR
over a considerable bandwidth, for some reference impedance value --
but that does not necessarily make it a useful antenna (think: dummy
load).

RF

In my previous post in this thread I asked about the gain and pattern
of this mesh antenna. Hopefully the inventor will respond when he is
able.

But being curious and not wanting to wait, I went back to his previous
thread about small antennas, and modeled what he posted there -- just
to learn what NEC would show for those parameters.

The results are given in the link below.

The h-plane azimuth gain of this mesh antenna is far from uniform, and
its 0.0134 + j85.45 ohm feedpoint impedance is very unfriendly --
though the frequency is centered in Art's stated VSWR bandwidth.

Even if this feedpoint Z was perfectly matched there to a 72 ohm
balanced transmission line, this mesh antenna would still be a poor
radiator compared to a 1/2-wave dipole.

http://i62.photobucket.com/albums/h8...sh_Antenna.jpg

RF

Wow! this Art guy is good, he actually got you to do his simulations for
him...
Olivier

Richard Fry wrote:
In my previous post in this thread I asked about the gain and pattern
of this mesh antenna. Hopefully the inventor will respond when he is
able.

But being curious and not wanting to wait, I went back to his previous
thread about small antennas, and modeled what he posted there -- just
to learn what NEC would show for those parameters.

The results are given in the link below.

The h-plane azimuth gain of this mesh antenna is far from uniform, and
its 0.0134 + j85.45 ohm feedpoint impedance is very unfriendly --
though the frequency is centered in Art's stated VSWR bandwidth.

Even if this feedpoint Z was perfectly matched there to a 72 ohm
balanced transmission line, this mesh antenna would still be a poor
radiator compared to a 1/2-wave dipole.

http://i62.photobucket.com/albums/h8...sh_Antenna.jpg

RF