Patent ID: 6087908
Filing Date: 2000-07-11
Classification: H01P

Abstract:
An ortho-mode transducer comprising:a common waveguide aligned along a central common axis and configured to carry a first polarized signal having a first wavelength and a second polarized signal having a second wavelength, said first and second signals having polarity vectors differing by a predetermined angle, said common waveguide having a shorting point;a first port waveguide configured to carry said first signal, said first port waveguide being coupled to said common waveguide above said shorting point with a first coupling aperture and being aligned along a central first port axis which is substantially perpendicular to the central common axis, said first coupling aperture configured to pass said first signal and cut off said second signal when said first port axis is perpendicular to the plane of polarization of said first signal;a second port waveguide configured to carry said second signal, said second port waveguide being coupled to said common waveguide above said shorting point with a second coupling aperture and being aligned along a central second port axis which is substantially perpendicular to the central common axis and offset from said first port axis by substantially said predetermined angle, said second coupling aperture configured to pass said second signal and cut off said first signal when said second port axis is perpendicular to the plane of polarization of said second signal; andsaid shorting point being approximately an odd number of quarters of said first wavelength from the vertical midpoint of said first port waveguide at said first aperture;wherein said first wavelength is substantially longer than said second wavelength, said common waveguide further comprising one or more ridges at said shorting point and aligned with said second port, said ridges configured to provide a virtual shorting point for said second signal at approximately an odd number of quarters of said second wavelength from the vertical midpoint of said second port waveguide at said second aperture.