Orthomode transducer with side-port window

Details Orthomode transducer with side-port window Orthomode transducer with side-port window

1993-04-22

1995-02-21

Pascal, Robert J.

Wave transmission lines and networks

Wave mode converters

333121, 333125, H01P 116

Patent

active

053920082

ABSTRACT:
A dual mode waveguide orthomode transducer has a section of circular waveguide (12) and a transition (16) from circular waveguide to rectangular waveguide disposed coaxially along a longitudinal axis (38). A terminus of the transition (16) opposite the circular waveguide (12) serves as a straight port (46) for input signals, and at the opposite end of the circular waveguide there is a front port (14) for outputting electromagnetic signals. A side port (48) connects via a tapered rectangular waveguide (40) perpendicularly to the longitudinal axis (38) to connect with the circular waveguide (12), and to couple electromagnetic energy into the circular waveguide (12) via a window (50) disposed in a sidewall (42) of the circular waveguide. A plane of polarization of a wave in one input port is perpendicular to a plane of polarization of a wave in the other input port. A plurality of vanes of differing widths (66, 68) is disposed in the tapered rectangular waveguide (40), the blades being parallel to broad walls of the rectangular waveguide. The blades (66, 68) are electrically conductive. Additional electrically conductive blades (60, 62) are disposed along the longitudinal axis 38 parallel to broad walls of the straight port (46) and are located between a center of the window (50) and the back end of the circular waveguide (12). A third blade (64) of electrically resistive material is located in the region of an interface between the circular waveguide and the transition.

REFERENCES:
patent: 4498062 (1985-02-01), Massaglia et al.
patent: 4758806 (1988-07-01), Mohring et al.
patent: 4786883 (1988-11-01), Spinner
patent: 4797681 (1989-01-01), Kaplan et al.
"Wide-Band Orthmode Transducers" by Stephen J. Skinner and Graeme L. James, IEEE Transaction on Microwave Theory and Techniques vol. 39 No. 2, Feb. 1991, pp. 295-297.

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