Waveguide for use in dual polarisation probe system having a signal reflector and rotator provide differential phase shift
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United States of America Patent
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Dec 4, 2007
Grant Date -
May 3, 2007
app pub date -
Nov 3, 2006
filing date -
Sep 9, 1996
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Abstract
A waveguide for use with a dual polarization waveguide probe system is described which provides an improved frequency response across a desired frequency range (10.7 to 12.75 GHz) and particularly at the band edges. This is achieved by providing a waveguide with a rotator that incorporates a reflector plate in combination with a differential phase shifter in the form of a waveguide of slightly asymmetrical cross section so that orthogonal signals which travel through this portion have a different cut-off wavelength. This results in a rotator which achieves 180.degree. of phase shift between two orthogonal components across the frequency range of signals received by the waveguide. The reflector plate and the differential phase shifter have inverse frequency characteristics so that the combined phase shift characteristic of the rotator has a flatter frequency characteristic.
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