Low profile waveguide channel diplexer

Claim 2

A waveguide transmission device comprising a conductivity bounded waveguide having a curved surface and a single plane surface and capable of propagating energy in a circular electrode mode, a bandpass cavity capable of supporting a resonant mode and mounted on the single plane surface of the waveguide, and means comprising a single aperture in the single plane surface for exclusively coupling energy between the circular electric mode in the waveguide and the resonant mode in the bandpass cavity, said bandpass cavity being a rectangular prism positioned so that the narrow cross-sectional dimension of the bandpass cavity lies on the single plane surface perpendicular to the axis of the waveguide.

Claim 3

A waveguide transmission device comprising, a segmented circular waveguide capable of supporting the H01 circular electric mode and having a circumferential surface and a plane chordal surface parallel to the axis of the waveguide, a primary bandpass resonant cavity of rectangular cross-section having selected narrow and broad dimensions and mounted on the chordal surface, a pair of band rejection resonant cavities of rectangular cross-section having said selected narrow and broad dimensions and mounted on the chordal surface downguide from the primary bandpass cavity, at least one thin aperture for the primary bandpass cavity and for each band rejection cavity located on the chordal surface for coupling between the H01 circular Electric mode of the waveguide and the resonant mode of the cavity, a secondary bandpass cavity having selected narrow and broad dimensions and mounted on the chordal surface, said secondary bandpass cavity being positioned upguide from said primary bandpass cavity longitudinally end-to-end with the primary bandpass cavity and coupled thereto through their mutual end wall, all of said cavities having a dimension chosen so that each cavity supports a resonant H10n rectangular mode in a common frequency band, and an output port coupled to said secondary bandpass cavity.

Claim 4

A waveguide transmission device comprising, a segmented circular waveguide capable of supporting the H01 circular electric mode and having a circumferential surface and a plane chordal surface parallel to the axis of the waveguide, a primary bandpass resonant cavity of rectangular cross-section having selected narrow and broad dimensions and mounted on the chordal surface, a pair of band rejection resonant cavities of rectangular cross-section having said selected narrow and broad dimensions and mounted on the chordal surface downguide from the primary bandpass cavity, at least one thin aperture for the primary bandpass cavity and for each band rejection cavity located on the chordal surface for coupling between the H01 circular Electric mode of the waveguide and the resonant mode of the cavity, a secondary bandpass cavity having selected narrow and broad dimensions and mounted on the chordal surface, said secondary bandpass cavity being positioned upguide from said primary bandpass cavity longitudinally end-to-end with the primary bandpass cavity and coupled thereto through their mutual end wall, all of said cavities having a dimension chosen so that each cavity supports a resonant H10n rectangular mode in a common frequency band, and an output port coupled to said secondary bandpass cavity.

Claim 5

A waveguide transmission device as claimed in claim 2 wherein the narrow cross-sectional dimension of each cavity lies on the chordal surface perpendicular to the axis of the waveguide.

Claim 6

A waveguide transmission device as claimed in claim 2 wherein said segmented circular waveguide has a semicircular cross-section.

Claim 7

A waveguide transmission device as claimed in claim 2 wherein the length of each cavity is selected so that n 2 for at least one of said cavities.

Claim 8

A waveguide transmission device as claimed in claim 2 wherein each of said cavities are mounted so that one wall of each cavity lies in a single common plane located a fixed distance from the chordal surface.

Claim 9

A waveguide transmission device as claimed in claim 2 wherein said cavities and the output waveguide have a common narrow dimension w and common narrow dimension t of the coupling apertures.