Re: NEC-LIST: Fano criteria

Jack, et al.:

In the 1950s, Chento Tai (then of Stanford Research Institute), tried
a similar approach to broadbanding the match to a dipole, again with
limited success.

It would be interesting to see how the various "optimizers", including
the Genetic Algorithm (GA), do compared to the auto-tuners on the
market. It would seem to me to be a good MSEE thesis topic.

Regards,

George

John Belrose wrote:
>
> >Hello
> >
> >I would like to know if anyone can tell me where I can get hold of the
> >1950 article by R.M. Fano, "Theoretical limitations on the broadband
> >matching of arbitrary impedances", J. Franklin Institute, vol. 249,
> >nos 1-2, pp 57-83 & 139-154 Jan-Feb.
> >
> >Thank you very much
> >
> >David de Haaij
>
> David,
>
> Any Technical/Scientific Library (University or Research
> Establishment) will be able to get a copy of Fano's paper for you,
> for a minimal cost.
>
> We have tried to use his techniques ( c40 years ago) to broadband
> match electrically short whip antennas, and to broaden the frequency
> response of dipole antennas, with some success. But manual/or
> automatically tuning an Antenna System Tuning Unit (ASTU) always
> gave better performance.
>
> While Fano's approach is unique, viz. one tries to design a network
> that has an impedance vs. frequency response that is the inverse
> response of the antenna system's response, perhaps (?) nowadays
> better techniques are possible base on Genetic Algorithms operating
> with NEC (c.f. papers by E. Michielssen, University of Illinois at
> Urbana-Champaign, and Randy Haupt, University of Nevada, Reno, NV).
>
> 73, Jack
Received on Sat Feb 12 2000 - 13:34:25 EST