Apparatus for dual-band antenna and communications tower comprising such apparatus are provided. The apparatus comprises a first part (202) comprising first and second propagation paths configured to selectively propagate signals of a first frequency with either a first polarization state or a second polarization state, a transition part (204) rotatable between first and second transition positions to selectively propagate signals of a second frequency along the second signal path with the first polarisation state when in the first transition position and with the second polarisation state when in the second transition position and a rotator part rotatable between first and second rotator positions. Wherein, the rotator part is configured to orientate the polarisation of signals in the second signal path in order to couple the second signal path to an interface, and allow propagation of signals in the first signal path in either the first or second rotator positions.

Apparatus for dual-band antenna and communications tower comprising such apparatus are provided. The apparatus comprises a first part (202) comprising first and second propagation paths configured to selectively propagate signals of a first frequency with either a first polarization state or a second polarization state, a transition part (204) rotatable between first and second transition positions to selectively propagate signals of a second frequency along the second signal path with the first polarisation state when in the first transition position and with the second polarisation state when in the second transition position and a rotator part rotatable between first and second rotator positions. Wherein, the rotator part is configured to orientate the polarisation of signals in the second signal path in order to couple the second signal path to an interface, and allow propagation of signals in the first signal path in either the first or second rotator positions.

The present disclosure provides a dual-band dual-polarization splitter connecting a cross-shaped waveguide power divider to with an E-plane waveguide magic T and an ortho-mode transition through an E/H-plane 90° curved waveguide to form a new type of coaxial waveguide ortho-mode transition, thereby implementing the structure of coaxial circular waveguide feeding in high and low frequencies at the same time, reducing the length of the high-frequency transmission line, and reducing the transmission loss. Meanwhile, the present disclosure implements dual-polarization transmission in each frequency band, and can flexibly switch between vertical polarization and horizontal polarization when the dual-polarization has been converted to the single-polarization.

The present disclosure provides a dual-band dual-polarization splitter connecting a cross-shaped waveguide power divider to with an E-plane waveguide magic T and an ortho-mode transition through an E/H-plane 90° curved waveguide to form a new type of coaxial waveguide ortho-mode transition, thereby implementing the structure of coaxial circular waveguide feeding in high and low frequencies at the same time, reducing the length of the high-frequency transmission line, and reducing the transmission loss. Meanwhile, the present disclosure implements dual-polarization transmission in each frequency band, and can flexibly switch between vertical polarization and horizontal polarization when the dual-polarization has been converted to the single-polarization.

A coaxial polarizer is provided. The coaxial polarizer includes an outer-conductive tube, an inner-conductive tube positioned within and axially aligned with the outer-conductive tube, and two dielectric bars each having a flat-first surface. The inner-conductive tube has two shallow-cavities on opposing portions of an outer surface of the inner-conductive tube. The shallow-cavities each have at least one planar area having a cavity length parallel to a Z axis and a cavity width, including a minimum width, perpendicular to the Z axis and to a radial direction of the inner-conductive tube. The flat-first surface has a dielectric length and width that are parallel and perpendicular to the Z axis, respectively. The dielectric length and dielectric width are less than the cavity length and the minimum width, respectively. The two flat-first surfaces of the respective two dielectric bars contact at least a portion of the respective two planar areas of the two shallow-cavities.

A coaxial polarizer is provided. The coaxial polarizer includes an outer-conductive tube, an inner-conductive tube positioned within and axially aligned with the outer-conductive tube, and two dielectric bars each having a flat-first surface. The inner-conductive tube has two shallow-cavities on opposing portions of an outer surface of the inner-conductive tube. The shallow-cavities each have at least one planar area having a cavity length parallel to a Z axis and a cavity width, including a minimum width, perpendicular to the Z axis and to a radial direction of the inner-conductive tube. The flat-first surface has a dielectric length and width that are parallel and perpendicular to the Z axis, respectively. The dielectric length and dielectric width are less than the cavity length and the minimum width, respectively. The two flat-first surfaces of the respective two dielectric bars contact at least a portion of the respective two planar areas of the two shallow-cavities.

A ferrite controller includes a single array of two or more ferrite control elements. The ferrite control elements each include a radio frequency (RF) path assembly that includes a RF path ferrite element and a RF path dielectric element. The ferrite control elements also include a magnetizing ferrite assembly that includes a magnetizing ferrite element; one or more structural dielectric elements; and a flexible insulated waveguide wall. The magnetizing ferrite element is attached to the one or more structural dielectric elements, wherein the flexible insulated waveguide wall surrounds the magnetizing ferrite element and the structural dielectric elements, wherein the RF path ferrite element and the magnetizing ferrite element are attached to form a ferrite toroid. The ferrite control elements also include two tapered impedance matching transformers attached to the RF path assembly and the magnetizing ferrite assembly.

A ferrite controller includes a single array of two or more ferrite control elements. The ferrite control elements each include a radio frequency (RF) path assembly that includes a RF path ferrite element and a RF path dielectric element. The ferrite control elements also include a magnetizing ferrite assembly that includes a magnetizing ferrite element; one or more structural dielectric elements; and a flexible insulated waveguide wall. The magnetizing ferrite element is attached to the one or more structural dielectric elements, wherein the flexible insulated waveguide wall surrounds the magnetizing ferrite element and the structural dielectric elements, wherein the RF path ferrite element and the magnetizing ferrite element are attached to form a ferrite toroid. The ferrite control elements also include two tapered impedance matching transformers attached to the RF path assembly and the magnetizing ferrite assembly.

A panel array antenna comprises an input layer including a waveguide network coupling an input feed on a first side thereof to a plurality of primary coupling cavities on a second side thereof, and an output layer on the second side of the input layer. The output layer includes an array of horn radiators, respective horn radiator inlet ports in communication with the horn radiators, and respective slot-shaped output ports in communication with the respective horn radiator inlet ports to couple the horn radiators to the primary coupling cavities. The horn radiators, the respective horn radiator inlet ports, and the respective slot-shaped output ports are integrated in a monolithic layer, which is configured to provide respective output signals from the horn radiators having a polarization orientation that is rotated by a desired polarization rotation angle relative to respective input signals received at the respective slot-shaped output ports coupled thereto.

A twist for coupling radiation between orthogonal waveguides is provided. The twist includes at least three cavities opening from at least one of a first X1-Y1 surface and a second X2-Y2 surface of a metal block. A first cavity has a first opening in a first Y-Z plane and a second opening in a second Y-Z plane offset from the first Y-Z plane by a first length. A second cavity shares the second opening with the first cavity and has a third opening in a third Y-Z plane offset from the second Y-Z plane by a second length and has at least two heights and at least two widths. A last cavity shares a next-to-last opening in a next-to-last Y-Z plane with a next-to-last cavity. The last cavity has a last opening in a last Y-Z plane offset from the next-to-last Y-Z plane by a last length.