In a vane there are reflections from two sides thats adds together.
When looking outside of the waveguide a contribution of just one side of a vane (half-vane?) can be shown if the source slit on the outside matches width of the vane.
In the picture above the width of the upper half-vane seems to be more in sync with the wave inside the waveguide.
The wave in the bottom half-vane is much stronger and "faster" because there is a shorter distance from the other side of the wider slit. So it sums in the different way than the half-vane above.
When looking outside of the waveguide a contribution of just one side of a vane (half-vane?) can be shown if the source slit on the outside matches width of the vane.
In the picture above the width of the upper half-vane seems to be more in sync with the wave inside the waveguide.
The wave in the bottom half-vane is much stronger and "faster" because there is a shorter distance from the other side of the wider slit. So it sums in the different way than the half-vane above.
Of course, we generally want to keep the channels narrow to keep all HOMs etc. within the channel itself out of band. Your example is already a little extreme, but yes, that's how it works. This should not be a problem in a more realistic situation, IMHO.
I'm working on the "meandering", wonder how will that turn out.
I'm working on the "meandering", wonder how will that turn out.
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Given the fact that this was the very first and blind attempt, it's not bad. It's still not perfect but already something one can work with 
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Image 2:
US3668335A - Electrostatic loudspeaker
- Google Patents
These by the way sound absolutely marvellous - best I have heard - in its fixed-up state as played at Dr. Forsells (Air LP player) house
//
US3668335A - Electrostatic loudspeaker
- Google Patents
These by the way sound absolutely marvellous - best I have heard - in its fixed-up state as played at Dr. Forsells (Air LP player) house
//
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Now I only wonder whether the channels could be made longer, with a slower expansion rate (i.e. moving the driver further to the left), terminating at the same waveguide interface.
It seems there would be nothing preventing us from forming a spherical wavefront even in such situation, i.e. not compromising on the directivity anymore... (?)
It seems there would be nothing preventing us from forming a spherical wavefront even in such situation, i.e. not compromising on the directivity anymore... (?)
Last edited:
Something like this, simply stretching it away from the original throat (and perhaps re-adjust the path lengths) -
Attachments
I don't have the time for that
- This is a comparison between an original throat and the vanes calculated based on the same throat. What still puzzles me is that the leading wavefronts in both cases are pretty far from following the elliptical coordinate lines (the vanes end all at u=1.5) but I'm sure there's an explanation for that as well.
- This is a comparison between an original throat and the vanes calculated based on the same throat. What still puzzles me is that the leading wavefronts in both cases are pretty far from following the elliptical coordinate lines (the vanes end all at u=1.5) but I'm sure there's an explanation for that as well.
Attachments
On the maximum contrast and with a long wavelength it's obvious it's still not perfect. I will try to make the vanes longer so that the meandering is still smooth. If this works out well, we'll be able to have our cake and eat it too
(i.e. have a clean constant directivity and a high loading at the same time, if anyone didn't understand what I mean)
(i.e. have a clean constant directivity and a high loading at the same time, if anyone didn't understand what I mean)
Attachments
As long as the dimensions are small, maybe this is all more robust than one could anticipate...
BTW, this is the Ath script code for this (functionality not released yet):
Vanes = {
Positions = 0.22,0.45,0.65,0.84
Starts = 0.05
Ends = 1.5,1.5,1.5,1.0
Meanders = 2.8,3.9,4.7,5.5
Points = 16
Thickness = 0.2
}
Ripple Tank code:
BTW, this is the Ath script code for this (functionality not released yet):
Vanes = {
Positions = 0.22,0.45,0.65,0.84
Starts = 0.05
Ends = 1.5,1.5,1.5,1.0
Meanders = 2.8,3.9,4.7,5.5
Points = 16
Thickness = 0.2
}
Ripple Tank code:
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