Tm01 mode exciter and a multimode exciter using same

Claim 2

A TM01 exciter comprising: a rectangular waveguide structure having a pair of broad walls extending between a pair of narrow walls for propagating electromagnetic waves, said rectangular waveguide structure having a pair of apertures disposed on one of the broad walls of said rectangular waveguide structure with said apertures being located on opposite sides of that center line of said one broad wall between the two narrow walls, and a circular waveguide structure joined normal to said one broad wall of said rectangular waveguide structure with the circular waveguide structure being symmetrically disposed relative to said apertures to provide, when an electromagnetic wave is propagated toward the junction through the rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TM01 mode with energy in TE11 mode being suppressed.

Claim 3

A TM01 exciter comprising: a rectangular waveguide structure having a pair of broad walls extending between a pair of narrow walls for propagating electromagnetic waves, said rectangular waveguide structure having a pair of apertures disposed on one of the broad walls of said rectangular waveguide structure with said apertures being located on opposite sides of that center line of said one broad wall between the two narrow walls, and a circular waveguide structure joined normal to said one broad wall of said rectangular waveguide structure with the circular waveguide structure being symmetrically disposed relative to said apertures to provide, when an electromagnetic wave is propagated toward the junction through the rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TM01 mode with energy in TE11 mode being suppressed.

Claim 4

A TM01 exciter comprising: a rectangular waveguide structure having a pair of broad walls extending between a pair of narrow walls for propagating electromagnetic waves, said rectangular waveguide structure having a pair of apertures disposed on one of the broad walls of said rectangular waveguide structure with said apertures being located on opposite sides of that center line of said one broad wall between the two narrow walls, and a circular waveguide structure joined normal to said one broad wall of said rectangular waveguide structure with the circular waveguide structure being symmetrically disposed relative to said apertures to provide, when an electromagnetic wave is propagated toward the junction through the rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TM01 mode with energy in TE11 mode being suppressed.

Claim 5

The combination as claimed in claim 1 wherein said apertures are elongated and extend along a portion of the length of said rectangular waveguide.

Claim 6

The combination as claimed in claim 2 wherein said elongated apertures are equidistant from the center line of the rectangular waveguide.

Claim 7

A multimode exciter comprising: a first rectangular waveguide structure for propagation of electromagnetic waves, said first rectangular waveguide structure having a pair of broad walls extending between a pair of narrow walls, said first rectangular waveguide structure having a pair of elongated apertures disposed in one of the broad walls of said first rectangular waveguide structure with the apertures being symmetrically disposed on opposite sides of that center line of said one broad wall between the two narrow walls, a circular waveguide structure disposed normal to said one broad wall of said first rectangular waveguide structure with the circular waveguide structure symmetrically disposed relative to the pair of elongated apertures to provide, when electromagnetic wave energy is propagated toward the junction along the first rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TM01 mode with energy in the TE11 mode being suppressed, said circular waveguide structure having at least one elongated aperture extending along the lengthwise axis of the circular waveguide wall, a second rectangular waveguide structure joined normal to said circular waveguide structure with the second rectangular waveguide structure being disposed relative to said aperture in the wall of said circular waveguide structure to provide, when electromagnetic wave energy is propagated toward the junction of the second rectangular waveguide structure and said circular waveguide structure through the second rectangular waveguide structure in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TE11 mode.

Claim 8

A multimode exciter comprising: a first rectangular waveguide structure for propagation of electromagnetic waves, said first rectangular waveguide structure having a pair of broad walls extending between a pair of narrow walls, said first rectangular waveguide structure having a pair of elongated apertures disposed in one of the broad walls of said first rectangular waveguide structure with the apertures being symmetrically disposed on opposite sides of that center line of said one broad wall between the two narrow walls, a circular waveguide structure disposed normal to said one broad wall of said first rectangular waveguide structure with the circular waveguide structure symmetrically disposed relative to the pair of elongated apertures to provide, when electromagnetic wave energy is propagated toward the junction along the first rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TM01 mode with energy in the TE11 mode being suppressed, said circular waveguide structure having at least one elongated aperture extending along the lengthwise axis of the circular waveguide wall, a second rectangular waveguide structure joined normal to said circular waveguide structure with the second rectangular waveguide structure being disposed relative to said aperture in the wall of said circular waveguide structure to provide, when electromagnetic wave energy is propagated toward the junction of the second rectangular waveguide structure and said circular waveguide structure through the second rectangular waveguide structure in the TE10 mode, maximum energy transfer into the circular waveguide structure in the TE11 mode.

Claim 9

The combination as claimed in claim 4 wherein the broad wall of said second rectangular waveguide structure is parallel to the lengthwise axis of said circular waveguide structure.

Claim 10

The combination as claimed in claim 5 wherein a pair of ridges are located within said circular waveguide structure.

Claim 11

The combination as claimed in claim 6 wherein said pair of ridges are aligned on opposite sides of said circular waveguide structure such that the angle formed by the intersection of a plane through the cross sectional center of the ridges and a plane through the cross sectional center of the second rectangular waveguide is equal to about 45 degrees.

Claim 12

The combination as claimed in claim 7 wherein a plurality of narrow elongated rectangular apertures are located in the wall of said circular waveguide structure with said second rectangular waveguiDe structure mounted perpendicular to said circular waveguide structure about the region of said apertures.

Claim 13

The combination as claimed in claim 8 wherein said narrow elongated apertures in said circular waveguide structure have their lengthwise axis parallel to the broad walls of said second rectangular waveguide.

Claim 14

The combination as claimed in claim 9 including a third rectangular waveguide structure perpendicular to and aligned with on opposite side of said circular waveguide structure relative to said second rectangular waveguide structure, said third rectangular waveguide structure being terminated in a short circuit with the broad wall along the lengthwise axis of said circular waveguide, said circular waveguide having a plurality of elongated apertures at the junction region of said third rectangular waveguide to said circular waveguide structure.

Claim 15

A multimode exciter comprising: a first rectangular waveguide structure for propagation of electromagnetic waves, said first rectangular waveguide structure having a pair of slot-like apertures disposed in one of the broad walls of said first rectangular waveguide structure with the apertures being symmetrically disposed on opposite sides of the center line of said waveguide, a circular waveguide structure disposed normal to said one broad wall of said first rectangular waveguide structure with the circular waveguide symmetrically disposed relative to said pair of apertures to provide, when electromagnetic energy is propagated toward the junction along the first rectangular waveguide in the TE10 mode, maximum energy into the circular waveguide in the TM01 mode, said first rectangular waveguide having a single slot-like aperture centered along a broad wall opposite said first-mentioned broad wall, a second rectangular waveguide structure disposed normal to said opposite broad wall of said first rectangular waveguide structure to provide, when electromagnetic energy is propagated toward the single aperture along said second rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide in the linear TE11 mode.

Claim 16

A multimode exciter comprising: a first rectangular waveguide structure for propagation of electromagnetic waves, said first rectangular waveguide structure having a pair of slot-like apertures disposed in one of the broad walls of said first rectangular waveguide structure with the apertures being symmetrically disposed on opposite sides of the center line of said waveguide, a circular waveguide structure disposed normal to said one broad wall of said first rectangular waveguide structure with the circular waveguide symmetrically disposed relative to said pair of apertures to provide, when electromagnetic energy is propagated toward the junction along the first rectangular waveguide in the TE10 mode, maximum energy into the circular waveguide in the TM01 mode, said first rectangular waveguide having a single slot-like aperture centered along a broad wall opposite said first-mentioned broad wall, a second rectangular waveguide structure disposed normal to said opposite broad wall of said first rectangular waveguide structure to provide, when electromagnetic energy is propagated toward the single aperture along said second rectangular waveguide in the TE10 mode, maximum energy transfer into the circular waveguide in the linear TE11 mode.

Claim 17

A waveguide system including a rotary joint for the coupling of signals within at least two frequency bands through said rotary joint comprising: a first circular waveguide structure, a second circular waveguide structure spaced from said first circular waveguide structure by said rotary joint, said first and second circular waveguide structures each having first and second ports, means responsive to signals within a first of said frequency bands at the first port of said first circular waveguide structure for exciting said signals within a first of said frequency bands in the TM01 mode along said first circular waveguide structure, means for coupling said signals within said first frequency band in the TM01 mode from the first circular waveguide structure through the rotary joint to said second circular waveguide structure, means responsive to said signal within said first frequency band signals in the TM01 mode at said second circular waveguide structure for the coupling of said signals within said first frequency band in the TM01 mode out of the first port of said second circular waveguide structure, means responsive to signals within a second of said frequency bands at the second port of said second circular waveguide structure for exciting said signal within said second frequency band in the linearly polarized TE11 mode along said second circular waveguide structure, means along said second circular waveguide structure responsive to said second frequency band signals in said linearly polarized TE11 mode for transforming said second frequency band signals to circularly polarized TE11 mode signals, means for coupling said second frequency band signals in the circularly polarized TE11 mode from said second circular waveguide structure through said rotary joint to said first circular waveguide structure, means at said first circular waveguide structure responsive to said second frequency band signals in said circularly polarized TE11 mode for transforming said second frequency band circularly polarized TE11 mode signals to second frequency band linearly polarized TE11 mode signals, and means responsive to said second frequency, linearly polarized TE11 mode signals at said first circular waveguide structure for the coupling of said signal in said second frequency band out of the second port of said first circular waveguide structure.

Claim 18

A waveguide system including a rotary joint for the coupling of signals within at least two frequency bands through said rotary joint comprising: a first circular waveguide structure, a second circular waveguide structure spaced from said first circular waveguide structure by said rotary joint, said first and second circular waveguide structures each having first and second ports, means responsive to signals within a first of said frequency bands at the first port of said first circular waveguide structure for exciting said signals within a first of said frequency bands in the TM01 mode along said first circular waveguide structure, means for coupling said signals within said first frequency band in the TM01 mode from the first circular waveguide structure through the rotary joint to said second circular waveguide structure, means responsive to said signal within said first frequency band signals in the TM01 mode at said second circular waveguide structure for the coupling of said signals within said first frequency band in the TM01 mode out of the first port of said second circular waveguide structure, means responsive to signals within a second of said frequency bands at the second port of said second circular waveguide structure for exciting said signal within said second frequency band in the linearly polarized TE11 mode along said second circular waveguide structure, means along said second circular waveguide structure responsive to said second frequency band signals in said linearly polarized TE11 mode for transforming said second frequency band signals to circularly polarized TE11 mode signals, means for coupling said second frequency band signals in the circularly polarized TE11 mode from said second circular waveguide structure through said rotary joint to said first circular waveguide structure, means at said first circular waveguide structure responsive to said second frequency band signals in said circularly polarized TE11 mode for transforming said second frequency band circularly polarized TE11 mode signals to second frequency band linearly polarized TE11 mode signals, and means responsive to said second frequency, linearly polarized TE11 mode signals at said first circular waveguide structure for the coupling of said signal in said second frequency band out of the second port of said first circular waveguide structure.

Claim 19

A waveguide system including a rotary joint for the coupling of signals within at least two frequency bands through said rotary joint comprising: a first circular waveguide structure, a second circular waveguide structure, said first and second circular waveguide structures having a common axis coupled to each other end to end through said rotary joint, each of the free ends of each of said circular waveguide structures being joined to two mutually perpendicular rectangular waveguides, said rectangular waveguides having their axes perpendicular to the axis of said circular waveguide structures, the first rectangular waveguide of said two rectangular waveguides and said first circular waveguide structure in coupling relation with each other so that signals within a first of said frequency bands along said first rectangular waveguide provide maximum energy transference into the circular waveguide structure in the TM01 mode and propagation of said signals within the first frequency band in the TM01 mode occurs, whereupon said TM01 mode signals propagate along said first circular waveguide structure through said rotary joint to said second circular waveguide structure, the second rectangular waveguide of said two rectangular waveguides joined to said second circular waveguide structure communicating with said second circular waveguide structure so as to provide coupling of said signals within the first frequency band in the TM01 mode out of said second rectangular waveguide, a third rectangular waveguide structure joined to said second circular waveguide structure communicating with said second circular waveguide structure to provide maximum energy transfer of said signals within the second frequency band of said two frequency bands to said second circular waveguide structure in the linearly polarized TE11 mode along said second circular waveguide structure, means along said second circular waveguide structure responsive to the second frequency band signals in said linearly polarized TE11 mode for transforming the second frequency band signals to circularly polarized TE11 mode signals whereupon said circularly polarized TE11 mode signals are coupled along said second circular waveguide structure and said rotary joint to said first circular waveguide structure, means at said first circular waveguide structure responsive to the second frequency band signals in said circularly polarized TE11 mode for transforming said second frequency band signals to linearly polarized TE11 mode signals, and a fourth rectangular waveguide structure joined to said first circular waveguide structure communicating with said first circular waveguide structure so that said TE11 mode signals within the second frequency band are coupled out of said second rectangular waveguide structure joined to said first circular waveguide structure.

Claim 20

A waveguide system including a rotary joint for the coupling of signals within at least two frequency bands through said rotary joint comprising: a first circular waveguide structure, a second circular waveguide structure, said first and second circular waveguide structures having a common axis coupled to each other end to end through said rotary joint, each of the free ends of each of said circular waveguide structures being joined to two mutually perpendicular rectangular waveguides, said rectangular waveguides having their axes perpendicular to the axis of said circular waveguide structures, the first rectangular waveguide of said two rectangular waveguides and said first circular waveguide structure in coupling relation with each other so that signals within a first of said frequency bands along said first rectangular waveguide provide maximum energy transference into the circular waveguide structure in the TM01 mode and propagation of said signals within the first frequency band in the TM01 mode occurs, whereupon said TM01 mode signals propagate along said first circular waveguide structure through said rotary joint to said second circular waveguide structure, the second rectangular waveguide of said two rectangular waveguides joined to said second circular waveguide structure communicating with said second circular waveguide structure so as to provide coupling of said signals within the first frequency band in the TM01 mode out of said second rectangular waveguide, a third rectangular waveguide structure joined to said second circular waveguide structure communicating with said second circular waveguide structure to provide maximum energy transfer of said signals within the second frequency band of said two frequency bands to said second circular waveguide structure in the linearly polarized TE11 mode along said second circular waveguide structure, means along said second circular waveguide structure responsive to the second frequency band signals in said linearly polarized TE11 mode for transforming the second frequency band signals to circularly polarized TE11 mode signals whereupon said circularly polarized TE11 mode signals are coupled along said second circular waveguide structure and said rotary joint to said first circular waveguide structure, means at said first circular waveguide structure responsive to the second frequency band signals in said circularly polarized TE11 mode for transforming said second frequency band signals to linearly polarized TE11 mode signals, and a fourth rectangular waveguide structure joined to said first circular waveguide structure communicating with said first circular waveguide structure so that said TE11 mode signals within the second frequency band are coupled out of said second rectangular waveguide structure joined to said first circular waveguide structure.