Why is Dolph-Chebychev windowing relatively obscure?

robert bristow-johnson wrote:
> On Tuesday, March 28, 2017 at 10:49:13 PM UTC-4,
> cl...@claysturner.com wrote:
>>
>> In Krauss' book "Antennas", The Dolph Chebyshev solution is offered
>> as a way to create a narrow beam from a broadside antenna array.
>> Dolph presented his solution back in 1946.
>>
>
> amazingly, Clay, i have that book.  took a course in antenna theory
> back in my undergrad days.  we had a prof (Ronald Moe) who was
> hard-core EM.  it's where i learned (with a trig substitution) that
> radiation patterns followed a polynomial (of cosine, i think) and we
> could design a great radiation pattern with Chebyshev polynomials.
>
> i think there are audio guys doing that with loudspeakers, but i
> cannot see how that can work for a wide bandwidth.
>

I'd think you'd need our head in a vice to listen to them
or the phase effects might make you dizzy.


> r b-j
>

-- 
Les Cargill

On Thursday, March 30, 2017 at 11:17:44 AM UTC-5, robert bristow-johnson wrote:
>
> i think there are audio guys doing that with loudspeakers, but i cannot see how that can work for a wide bandwidth.

Robert, the only wide-bandwidth audio beamforming work of which I am aware is by Keele: http://www.xlrtechs.com/dbkeele.com/CBT.php

On Thursday, March 30, 2017 at 12:17:44 PM UTC-4, robert bristow-johnson wrote:
> On Tuesday, March 28, 2017 at 10:49:13 PM UTC-4, cl...@claysturner.com wrote:
> > 
> > In Krauss' book "Antennas", The Dolph Chebyshev solution is offered as a way to create a narrow beam from a broadside antenna array. Dolph presented his solution back in 1946.
> > 
> 
> amazingly, Clay, i have that book.  took a course in antenna theory back in my undergrad days.  we had a prof (Ronald Moe) who was hard-core EM.  it's where i learned (with a trig substitution) that radiation patterns followed a polynomial (of cosine, i think) and we could design a great radiation pattern with Chebyshev polynomials.
> 
> i think there are audio guys doing that with loudspeakers, but i cannot see how that can work for a wide bandwidth.
> 
> r b-j

Very Cool you have his book! I actually have 3 of Krauss' books: Antennas, E&M, and Radio Astronomy. Even though he was a EE, he operated a radio telescope at OSU for years. He was most def. an E-Mag kind of a guy.

Clay