Birefringent corrugated waveguide
This patent describes a corrugated waveguide having a circular bore and noncircularly symmetric corrugations, and preferably elliptical corrugations which 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 {minus} 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.
- Assignee:
- Dept. of Energy, Washington, DC (USA)
- Patent Number(s):
- US 4906951; A
- Application Number:
- PPN: US 7-310555A
- OSTI ID:
- 6661597
- Resource Relation:
- Patent File Date: 15 Feb 1989
- Country of Publication:
- United States
- Language:
- English
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Birefringent corrugated waveguide
EXPERIMENTAL INVESTIGATION OF MICROWAVE PROPAGATION IN A PLASMA WAVEGUIDE