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Title: Birefringent corrugated waveguide

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.
Authors:
 [1]
  1. (Del Mar, CA)
Publication Date:
OSTI Identifier:
867291
Report Number(s):
US 4906951
DOE Contract Number:
AC03-84ER51044
Resource Type:
Patent
Research Org:
CALIFORNIA INSTITUTE OF TECH
Country of Publication:
United States
Language:
English
Subject:
birefringent; corrugated; waveguide; corrugated; waveguide; circular; bore; noncircularly; symmetric; corrugations; preferably; elliptical; corrugations; provides; birefringence; rotation; polarization; 11; mode; corrugated; waveguide; fabricated; cutting; circular; grooves; lathe; cylindrical; tube; rod; aluminum; diameter; suitable; bore; waveguide; cutting; approximation; ellipses; corrugations; cutting; radius; bore; axis; bore; radius; circular; cuts; radius; centers; -b; axis; waveguide; bore; alternatively; stock; mandrel; formed; elliptical; transverse; section; circular; grooves; cut; lathe; leaving; elliptical; corrugations; grooves; mandrel; electroplated; dissolved; leaving; corrugated; waveguide; noncircularly; symmetric; corrugations; transition; waveguide; gradually; varies; circular; elliptical; corrugations; couple; circularly; corrugated; waveguide; elliptically; corrugated; waveguide; corrugated waveguide; corrugated waveguide; corrugated waveguide; corrugated waveguide; corrugated waveguide; corrugated waveguide; circular bore; circular groove; circular groove; cylindrical tube /333/