Birefringent corrugated waveguide

Details Birefringent corrugated waveguide Birefringent corrugated waveguide

1989-02-15

1990-03-06

Gensler, Paul

Wave transmission lines and networks

Wave mode converters

333242, H01P 1165, H01P 3123

Patent

active

049069519

ABSTRACT:
A corrugated waveguide having a circular bore and noncircularly symmetric corrugations, and preferably elliptical corrugations, provides birefringence for rotation of polarization in the HE.sub.11 mode. The corrugated waveguide may be fabricated by cutting circular grooves on a lathe in a cylindrical tube or rod of aluminum of a diameter suitable for the bore of the waveguide, and then cutting an approximation to ellipses for the corrugations using a cutting radius R.sub.0 from the bore axis that is greater than the bore radius, and then making two circular cuts using a radius R.sub.1 less than R.sub.0 at centers +b and -b from the axis of the waveguide bore. Alternatively, stock for the mandrel may be formed with an elliptical transverse cross section, and then only the circular grooves need be cut on a lathe, leaving elliptical corrugations between the grooves. In either case, the mandrel is first electroplated and then dissolved leaving a corrugated waveguide with noncircularly symmetric corrugations. A transition waveguide is used that gradually varies from circular to elliptical corrugations to couple a circularly corrugated waveguide to an elliptically corrugated waveguide.

REFERENCES:
patent: 3201723 (1965-08-01), Martin et al.
patent: 4305051 (1981-12-01), Hai
patent: 4429290 (1984-01-01), Devan
patent: 4673905 (1987-06-01), Yamawaki et al.
patent: 4680558 (1987-07-01), Ghosh et al.

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