On 6/9/12 5:03 PM, David Kirkby wrote:
On 10 June 2012 00:14, Azelio Boriani<[email protected]> wrote:
Yes, you are right and this is the problem I have. I'm aware that wonderful
things can be done starting with a simulator, not just tell whether or not
the antenna will be on frequency. I have to fill the gap and learn how to
successfully use a simulator.
The other issue of course is the cost of them. Prices can easily reach
5 figures - $, Euros or GBP.
NEC can do a pretty good job on a helix, and it's free. I like 4nec2 as
a front end.
NEC will also do a patch: Model it as a grid of wires using the
guideline of "surface area of wire is spacing between wires".. that is,
if you have wires on a 1cm grid, then the wire diameter should be 1/pi
cm. Even if you thin the wires out (so you can get them closer to the
ground plane), it still works pretty well. While in days of yore,
running a NEC model with 10,000 segments would have been an overnight
run, today, it's pretty quick.
But yes, if you want to design the feed for a patch, or do RF circuit
layout (particularly in an enclosure), you want HFSS, ADS, or programs
of that ilk. ANd, they are, as noted, pretty pricey. Worth every penny
if your job is doing this kind of design, but kind of a big step for a
casual experimenter.
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