Patent ID: 9245513
Filing Date: 2016-01-26
CPC Classification: G10K,H04R

Claim Text:
1. A radial input waveguide comprising three consecutive passageways virtually divided by two folding regions along its axial extension from the radial input up to a substantially rectangular output being positioned on the waveguide output plane which is substantially normal to the axis, each consecutive passageway forming a different type of waves traveling in different directions and all three passageways are shaped between an internal body and a shell enclosing it at a distance, the first passageway is an outwardly radially expanding air channel, having its cylindrical circular input area face contiguously axial to the internal body input wall face and its input diameter and its input area substantially equal to the respective counterpart compression driver output diameter and output area, and forming a cylindrical wave front, radially expanding between the two substantially parallel input walls of the internal body and the shell up to said first folding region arranged on a pre-determined periphery, said periphery circularly or slightly elliptically shaped generally vertically or horizontally oblong, whereto from, wave front is folded and conical frustum shell-like generatrices of the second air channel with increased thickness towards a common frustum floor plane are shaped, said frustum large floors lying on the waveguide output plane, whereto on, defining a projected annulus area numerically equated to the rectangular waveguide output area, and defining at that plane the heights of the internal body and the shell, whereas two symmetrical pairs of side wall forming vertical surfaces, each pair positioned on one side of the axial vertical plane of symmetry, and the two vertical surfaces from each pair tangential to the frustum shell small floors and forming one symmetrical half of the rectangular output width on said waveguide output plane, thus cutting two pairs of conic sections from the frustums and each pair of said conic sections defining one symmetrical half of the second folding region and one symmetrical half of the third air channel passageway respectively, said third air channel passageway shaped between the two vertical surfaces from the second folding region up to the respective half of the waveguide output, whereas said air channel passageway is having its total horizontal width D equal to a predetermined part from its total height H at the output, which ratio H/D controls the output wave front curvature along the height of the waveguide output on said output plane.