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.

An orth-mode transducer (OMT) assembly, including an OMT common port, an OMT feeder, and a polarization separated core. An input end of the OMT common port is connected to a single polarization antenna, one end of the OMT feeder is connected to an output end of the OMT common port, and an other end of the OMT feeder is connected to the polarization separated core, the OMT feeder has a tubular structure, and horizontal and vertical axes of an inner wall cross section of the OMT feeder are unequal, or a tuning rod is disposed in a tube of the OMT feeder and is perpendicular to an extension direction of the tube, and a vertical polarization port and a horizontal polarization port are disposed in the polarization separated core, the vertical polarization port transmits a vertical polarization wave, and the horizontal polarization port transmits a horizontal polarization wave.

An orth-mode transducer (OMT) assembly, including an OMT common port, an OMT feeder, and a polarization separated core. An input end of the OMT common port is connected to a single polarization antenna, one end of the OMT feeder is connected to an output end of the OMT common port, and an other end of the OMT feeder is connected to the polarization separated core, the OMT feeder has a tubular structure, and horizontal and vertical axes of an inner wall cross section of the OMT feeder are unequal, or a tuning rod is disposed in a tube of the OMT feeder and is perpendicular to an extension direction of the tube, and a vertical polarization port and a horizontal polarization port are disposed in the polarization separated core, the vertical polarization port transmits a vertical polarization wave, and the horizontal polarization port transmits a horizontal polarization wave.

Microwave antenna systems include a parabolic reflector antenna and a dual-band feed assembly. The dual-band feed assembly includes a coaxial waveguide structure and a sub-reflector. The coaxial waveguide structure includes a central waveguide and an outer waveguide that circumferentially surrounds the central waveguide. The sub-reflector is mounted proximate the distal end of the coaxial waveguide structure.

An orthomode transducer and to a satellite transmission chain includes the orthomode transducer, for transmitting a first signal and a second signal in orthogonal propagation modes. The transducer comprises: a primary waveguide with a square or rectangular cross section, two guided access means having firstly a free end via which the first signal and the second signal are respectively injected or recovered, and secondly two arms connected to the primary waveguide. Each guided access means comprises a junction configured so as to connect the free end to the two arms of the guided access means, the two arms of each guided access means being connected to the primary waveguide at two off-centred locations on one or more sides of the primary waveguide symmetrically about an axis of symmetry of the primary waveguide.

An orthomode transducer and to a satellite transmission chain includes the orthomode transducer, for transmitting a first signal and a second signal in orthogonal propagation modes. The transducer comprises: a primary waveguide with a square or rectangular cross section, two guided access means having firstly a free end via which the first signal and the second signal are respectively injected or recovered, and secondly two arms connected to the primary waveguide. Each guided access means comprises a junction configured so as to connect the free end to the two arms of the guided access means, the two arms of each guided access means being connected to the primary waveguide at two off-centred locations on one or more sides of the primary waveguide symmetrically about an axis of symmetry of the primary waveguide.

The present disclosure provides an over-the-air measurement system for testing a device under test. The over-the-air measurement system includes an orthomode transducer (OMT) assembly having several separately formed orthomode transducer components that form at least two orthomode transducers. The orthomode transducer assembly has at least two output interfaces for feed antennas. Each of the at least two output interfaces is connected with one dedicated orthomode transducer. Two input interfaces are associated with each of the orthomode transducers. Each of the input interfaces merge into a corresponding waveguide transition that ends up in the respective orthomode transducer that is associated with the corresponding input interface. The several orthomode transducer components are stacked together linearly.

The present disclosure provides an over-the-air measurement system for testing a device under test. The over-the-air measurement system includes an orthomode transducer (OMT) assembly having several separately formed orthomode transducer components that form at least two orthomode transducers. The orthomode transducer assembly has at least two output interfaces for feed antennas. Each of the at least two output interfaces is connected with one dedicated orthomode transducer. Two input interfaces are associated with each of the orthomode transducers. Each of the input interfaces merge into a corresponding waveguide transition that ends up in the respective orthomode transducer that is associated with the corresponding input interface. The several orthomode transducer components are stacked together linearly.

An asymmetric, broadband, compact and low-PIM orthomode transducer comprised of two parts is presented. Mating of the two parts results in the formation of a choke flange as well as a critical impedance step which suppresses unwanted modes and enables broadband matching of the junction between the two parts. Furthermore, a cruciform-quatrefoil waveguide type is utilized that transitions to an aperture. This waveguide configuration can lead to a lower overall part length, an improved reflection, and reduced manufacturing costs.