Cross-polarization corrector for circular waveguide

DETAILED DESCRIPTION What is claimed is: 1.
A transmission line comprising: circular waveguide means adapted for propagating a signal in the form of a first polarized electromagnetic signal in a longitudinal direction through said waveguide means, said waveguide means having unavoidable size variations which result in undesired generation of a cross-polarization signal which accompanies said first polarized signal; first coupling means coupled to said circular waveguide means for extracting a sample of said first polarized signal from said waveguide means and producing a sample signal; second coupling means coupled to said circular waveguide means for coupling to said cross-polarization signal; and third coupling means coupled to said first and second coupling means for coupling said sample signal to said second coupling means with an amplitude and phase to reduce said cross-polarization signal.
2.
A transmission line according to claim 1 wherein said first coupling means comprises a voltage probe.
3.
A transmission line according to claim 1 wherein said third coupling means comprises a coaxial transmission line coupled to said first coupling means.
4.
A transmission line according to claim 2 wherein said third coupling means comprises a coaxial transmission line coupled to said voltage probe.
5.
A transmission line according to claim 1, wherein said first and second coupling means comprise voltage probes.
6.
A transmission line according to claim 1 wherein said first coupling means comprises a voltage probe; said third coupling means comprises a narrow rectangular waveguide through which an extension of said voltage probe extends for coupling energy from said voltage probe into said narrow waveguide; and said second coupling means comprises a probe coupled to said extension for generating a waveguide-mode signal, and said second coupling means further comprises a junction of said rectangular waveguide with said circular waveguide means for coupling said waveguide-mode signal into said circular waveguide means to cancel said cross-polarization signal